The Q&A for Sean's talk is available exclusively for our KZbin members here: kzbin.info/www/bejne/qYCYkpeYi8Sgq5o Despite our fancy name, we're actually a charity that relies on donations to keep going. If you sign up to become a Science Supporter on our KZbin channel, you'll be helping us connect more scientists with the public, so we can bring you more incredible lectures like this one. You can sign up here: kzbin.info/door/YeF244yNGuFefuFKqxIAXwjoin
@ShonMardani9 ай бұрын
In the formula F=ma, a has a time variable which means F = 0 when time = 0 and Force can not be calculated unless you provide time duration. The parameter a Acceleration is due to the Gravity and Gravity has a set vector / direction, 0 to 180 degree, in other words there is NO Acceleration if there is NO Gravity, and in Gravity direction and Time needed. Force is 0 (zero) unless you give a non zero time. This is what scientists have been hiding and the space time scam is to explain a flawed formula using the gang leader einstein. E=mc2 is also False since you can change the constant 2 to 3 or any other number, it has no effect because E has no Unit. Also all the formulas mentioned as the successor to E=mc2, has the Time variable with the value 0 (zero) which makes all the calculated Forces, Energies and Vectors Zero. Additionally einstein never wrote and published any of these formulas and no other scientist wanted to claim Fallacy.
@davidfarrar49939 ай бұрын
Òòòòòò ll òo 2:40 😮go gl4r6
@Michael-cf9lf9 ай бұрын
Would Ri consider a series of videos with Michio Kaku with the Ri giving him a series of topics to discuss without interruption or others on stage just him by himself..
@superalex78809 ай бұрын
@ShonMardani maybe this is why Einstein never got the Nobel for his Relativity😢
@kwimms9 ай бұрын
Einstein was an bad actor who had relations with both of his cousins, hence his equation... Einstein = Married Cousins x2 .
@candidobertetti279 ай бұрын
This man made advanced physics accessible to the masses. If there is something similar to the Nobel Prize for science communication then he truly deserves one.
@davidhand97219 ай бұрын
If you ever find yourself saying "made advanced physics accessible to the masses", you're working with an inaccurate definition of either "advanced physics" or "masses".
@candidobertetti279 ай бұрын
@@davidhand9721 I'd like to know what's wrong with my comment as English is not my first language. General Relativity (and the whole series called "The Biggest Ideas in the Universe" by Sean Carroll) is not exactly basic physics, that's why I used the word "advanced". By "masses" I mean ordinary people, those who don't have a high degree of education in physics, or any other field of science for that matter.
9 ай бұрын
@@candidobertetti27 Then you just need to define accessible :-)
@fabiocaetanofigueiredo13539 ай бұрын
I understand the comment and maybe could be better expressed by "comprehensible by the average individual"
@candidobertetti279 ай бұрын
@ My bad then, I thought my comment was clear. By "accessible" I mean, as explained in another user's comment, that he made understandable to the average people essential points at the foundations of certain theories. In the series of videos by Sean Carroll that I mentioned earlier, he covers topics that, until now, only a student of a master's degree in Physics would hear about. For instance, he talks about field quantization, renormalization, the work of Kenneth Wilson, as well as symmetry groups, general relativity and so on. But he goes beyond words and provides heuristic, yet correct, mathematical descriptions. The main prerequisite to understand the level of those lectures is basically high school mathematics. In my opinion, this work deserves more media attention because these are very specific topics that rarely find a place in popular science.
@stephenhicks8268 ай бұрын
I'm 70 year old retired Physics teacher and was mesmerised by Carroll's wonderful presentation. The best teachers have a way of bringing clarity and simplicity to very difficult concepts. Brilliant, thank-you.
@whirledpeas34775 ай бұрын
Mesmerized, Wow
@TheFrewah5 ай бұрын
Veritasium on youtube is fantastic. Math and physics. Outstanding
@kevintruman99813 ай бұрын
God bless him
@TheFrewah3 ай бұрын
I had a really good math/physics teacher in high school. Then I studied at the Royal Institute of Technology and he went there too to do his PhD.
@gavanknox32202 ай бұрын
yes Stephen .... I too am a semi-retired Physics teacher of the same generation 1954 who appreciated Carols excellent presentation. Thanks
@thomasdaniel1009 ай бұрын
I suffered a brain injury a few years ago and it is sometimes difficult to understand simple concepts, nevermind complex concepts. Thank you Sean Carroll for simplifying subject matter for those of us who want to understand the science we love so much. Thank you RI for the same. I may not be able to do the math and I may never be an engineer again but this video makes me feel like im included again.
@helifynoe99309 ай бұрын
I had a head injury at the age of 10. So the side effects dropped me from the top of the class, to the bottom, and eventually had me dropping out of school altogether. Teachers basically thought of me as the dumbest person in the class, due to me now having difficulty retaining long term memories. However, despite me having no physics education what so ever, I still managed to independently discover the special relativity phenomena, and how this phenomena is created, along with deriving the special relativity mathematical equations at the same time. Have a look at how I did it, if interested. Anyhow, never let brain injuries hold you back.
@kwimms9 ай бұрын
It's all bs... maybe you are a zombie and don't realize it.
@thomasdaniel1009 ай бұрын
@@kwimms meaning?
@optimism_of_will8 ай бұрын
@@thomasdaniel100 he's an asshole, ignore him and always believe that you will make a comeback. Sometimes as they say reality is stranger than fiction
@mavelous17637 ай бұрын
Keep up the good work. The brain is always working to overcome injuries. Be vigilant, and your brain will respond
@gcewing9 ай бұрын
Plot twist: After this lecture was over, the audience tried to leave the hall and found they were in a rocket ship far out in space accelerating at 1g.
@peterspiker99609 ай бұрын
As I get older I find the admiration I used to have for my favourite musicians is fading (only a little) and I’m becoming more fascinated by what people like Sean M. Carroll have to teach me. I may be too old for out-and-out hero worship, but I am definitely a big fan of these big thinkers. Hooray for RI, Mindscape and Sean Carroll!
@JRush3749 ай бұрын
Read QED by Richard Feynman and watch his lectures and videos. The video Fun to Imagine is great.
@stephenbarrette6109 ай бұрын
@@JRush374 Totally agree, it’s a great book and you really have to concentrate - well I did! Feynman is a hero of mine and I think I have all his books. I remember the BBC Horizon documentary when it came out and have a VHS copy somewhere. But thanks to KZbin anyone can see this extraordinary man talk about jiggling atoms and flowers.
@kiers19709 ай бұрын
I agree totally too. I'm not daft or particularly intelligent.. I can think like this now too, appreciate possibly more than understand incredibly brighter minds more than ours. I wonder how many possible, probable almost genius minds have been missed, shunned or ignored at schools? Young men especially, develop and mature intelligently years after Girls...
@stephenbarrette6109 ай бұрын
Actually I totally agree with you being an old person, very old person.
@robertwood99849 ай бұрын
Wow!!!👍 Thank you!!!
@BikeArea9 ай бұрын
You are fully blown away by this guy's rhetorical talent and the uninterrupted talk. He never stutters, hangs or uses filler words. By the way: Great to hear a german word he uses (Ansatz). 😀
@daxramdac71949 ай бұрын
This was the best presentation I've seen on this subject. And I'm not at all surprised that it was given by Sean Carrol with his brilliant ways of explaining things, his clear voice, and keeping your attention. The historical context shown behind the equation, and the motivation behind its construction over time was not only fascinating, but so excellently and expertly presented, without having to go off on any tangents or use too many analogies. And without insulting the intelligence of the audience with things like "imagine the swing you played on as a kid" or "imagine the strings on a guitar", just straight build up of the logic behind going from the Newtonian formulation up to the final Einstein equation, and all the players involved along the way. Perfect.
@pokerman89103 ай бұрын
Sean Carroll is like John Mulaney for science.
@migfed9 ай бұрын
This is clearly the next step: start explaining the math in a friendly way. Sean Carroll at his best. Thank you so much.
@stylis6669 ай бұрын
The step that follows is teaching the basics of relativity and quantum mechanics to 10 year olds. And start teaching the accompanying maths at about 14yo, when there's a little algebra and geometry knowledge. Maybe :) And maybe that's not for all children, but my youngest nephew of 10yo loves it and has a very quick understanding of complex abstract physics because of his intuitive and creative mind that has no problems with thinking of spacetime as four dimensional curving geometry or how probability would lead to a particle to potentially end up on the other side of a barrier. He just sees the barrier as a wall that holds back part of the probability wave as it would a water wave, but if the wall is thin enough some of it might leak through, especially if you consider that most of the wall is empty space. But the point is that children can understand a lot more than we think they can. I'm guessing that we think that they can't because the maths is difficult and we're usually taught such things when we can understand the accompanying equations and maths, but that's entirely unnecessary for the basics of physics. You can easily show a relation between push and acceleration without making a child calculate it. If you push harder, there's a larger acceleration. A child can see that easily. We don't have to know the exact ratio to understand the principle.
@Chaobai9 ай бұрын
I really like the way Sean Carroll presents all the scientific concepts. He always explains how they evolve over time and that really helps me understand how we get where we are in science for a certain topic. Most worthy membership I have ever had.
@TheRoyalInstitution9 ай бұрын
Thanks so much for joining as a member! We're very glad you liked Sean's latest video, he's definitely one of the best when it comes to explaining scientific concepts.
@gordonspond9 ай бұрын
Agree. I wish my college professors would have spent a bit more time on the history of science as well, rather than endless formulas. It (1) would have helped put things in perspective / allowed me to connect the dots better and (2) I would have realized that certain concepts didn't just pop up one day in someone's super-smart brain, but literally took centuries to be developed / discovered.
@MI-qj6xr9 ай бұрын
There’s a certain similarity between Sean Carroll and James woods. James woods has a 180 iq (or so the internet says) and I would bet Sean Carroll is near that . He’s great at illustrating his point on complex subjects in a simple and understandable way.
@JohnnyComelately-eb5zv9 ай бұрын
I agree. He's great. Fantastic communicator and such a nice guy with a sense of humour. Pity he's wrong about quite a lot! For example, his Many Worlds Interpretation is complete nonsense.
@joje869 ай бұрын
@@MI-qj6xrJames Woods definitely does not have an IQ of 180 (at least not in any meaningful sense). This for a multitude of reasons. Mainly because no well established IQ tests have any reliability in that range and a score that high on a typical IQ test (which are unreliable outside 2 standard deviations of the mean, i.e. outside 70-130) is basically meaningless. Part of the same rumors was that he was a member of MENSA, or that MENSA was the source of this oft quoted score, something that MENSA quickly denied (they were also stonewalled by Woods and his publicist when they tried to reach them about the rumors, since some sources implied that Woods himself might be the original source of the claims). He did supposedly score very high on his SAT, but his score was not on par with the 1 in 20 million that an IQ of 180 is (I couldn't verify his SAT score either, but it's a far less extreme claim and the guy did supposedly get into MIT based on his SAT and I couldn't find any repudiation of this from MIT). Basically, nobody seems to know where the 180 figure really comes from (and it's often quoted as 184 or 160 as well). It seems to have started as tabloids, gossip bloggers, and clickbait sites bouncing the rumor back and forth, though the rumor also seems to have had a resurgence in right-wing media in the last couple of years. The guy might at some point in time have taken a test that gave him a score of 180, but so did most everyone who has access to the web in the early 2000s. I remember that I scored over 200 on some of those ridiculous tests floating around the web back then. Another popular claim is that Woods has an IQ higher than Leonardo Da Vinci, and this one might actually be true. However, this is not really a meaningful claim either. If we extrapolate the Flynn effect that far back, a lot of us probably have an IQ higher than Leonardo, maybe most of us. And even if we ignore the Flynn effect, there is basically no reliable way to estimate the IQ of someone living that far back. And since we do know that the Flynn effect is at least true in the last century and thus that IQ scores change significantly over time, someone living that far back can't be meaningfully compared with someone living today. Don't get me wrong, the guy might be super smart. There's just no reason to believe any specific claims that high unless there is very strong evidence from a reputable source.
@andrewgormley29589 ай бұрын
Always fantastic to see a Sean Carroll lecture, especially at the RI. Day one of the membership has started well!
@TheRoyalInstitution9 ай бұрын
This is great to hear! And a huge thank you to you for joining our KZbin channel membership and supporting science 😀
@myopenmind5279 ай бұрын
One of the best communicators in science. I’ve never failed to be equally entertained and educated by listening to his talks.
@250txc9 ай бұрын
Maybe on your words but 99.99% of us did not understand ANYTHING he said ... Most of us were just amazed any human could dream this up...
@kwimms9 ай бұрын
One of the best liars in Science.
@erikfinnegan9 ай бұрын
Prof. Carroll is the only science communicator who can pull off this feat of educating the general public about Maths. So vivid. So approachable.
@cougar18619 ай бұрын
And so profoundly desperately needed!!!
@phillupson85619 ай бұрын
Always love a Sean Carroll lecture, just think without the Internet we'd have to smart enough to get into his class and I suspect many of us wouldn't make it, what a time to be alive.
@paulscott25029 ай бұрын
Sean Carroll has an astounding gift for explaining very complex concepts into much simpler terms.
@miinyoo9 ай бұрын
Sean is a great communicator and a sweetheart. I think equations are fun but they often look misleading largely for short hand reasons. Unpacking equations and looking at all the knobs hidden by symbols really is the only way to understand them. Having Sean break them open and show their inner working bits is an enormous help.
@joestitz2399 ай бұрын
Indeed. On the enterprise in engineering they turned knobs =ing the short hand way to communicate to the computer the shorthand of what to do; as the computer could read the equation showing also people who built it knew from us today that Eventually, man did figured how to be as smart as the equation itself :)
@grahamwilson88439 ай бұрын
This is perhaps my favorite RI lecture I've seen yet. I really love getting a better look at these more complex ideas about physics, and I hope to see now like this. Really nice work, Sean and RI!
@beln335 ай бұрын
You're wright. A well deserved 'excellent too' second is the one on quantum fields. Try it.
@willemvdk48869 ай бұрын
Yes! A new Sean Carroll lecture! This man is such a good presenter and spokesperson for science.
@meacadwell9 ай бұрын
He is, hands down, one of my favorite presenters. He can make a droll topic interesting.
@IvanMorenoPlus9 ай бұрын
Sean Carroll is a joy to read, but he is way funnier and more to the point in a lecture! Perhaps the best explanation of Einstein's field equations I have seen. Thank you!
@marcosfreijeiro87639 ай бұрын
Fantastic talk as usual from Sean Carroll and his books are worth reading. Great content thanks RI
@amritsharma53739 ай бұрын
What a great lecture. Thanks to Sean and the Royal Institute for making it accessible.
@andremaccarini16569 ай бұрын
Wish we had more professors like this guy.
@davidwilder75429 ай бұрын
One of the best lecturers on KZbin. Makes me want to study physics again. On a note, his books are great 👍. Thank you.
@rayoflight629 ай бұрын
This is the best lesson on General Relativity I have attended, ever. Compliments to Prof. Carroll for his unequalled ability in explaining such complex matter with simple words. Regards Anthony
@everythingisalllies21419 ай бұрын
A bit too simple.. He forgot to explain why the theory, like all Einsteins theories are nonsensical. He forgot to mention that little gem.
@candidobertetti279 ай бұрын
@@everythingisalllies2141 A "little gem" that only science deniers could say, which he's not.
@everythingisalllies21419 ай бұрын
@@candidobertetti27 I'm not "denying science", that is real science, I'm calling out liars who spread nonsense dressed up as science.
@candidobertetti279 ай бұрын
@@everythingisalllies2141 Yeah, because of course you know better than Einstein.
@everythingisalllies21419 ай бұрын
@@candidobertetti27 I don't need to be "better" than Einstein or anyone else, I only need to examine his claims in his hypothesis and weight them up to the accepted standards of rational analysis and Logic. And unfortunately for Einstein his claims do not make the grade in any way. In fact, it would be fair to say that he seems to have based his hypothesis in a purposeful deception, in other words he lied by telling half truths mixed in with truths in order to deceive. It worked well on you is seems, because you have never bothered to read his hypothesis with a scientific mind set, that of being skeptical. If you did read his paper, it would have been form the point of view of a fawning, awe struck worshiper.
@cyclonasaurusrex15259 ай бұрын
Absolutely stunning. To be a master both of the subject AND of how to convey it is remarkable.
@Anime_games-_-XUnknown9 ай бұрын
Equations are too special I remember in highschool gauging at the Archimedes' principle for quite a lot of time and when you finally understand the mathematical realations between the symbols / quantities, it's amazing
@JamesSarantidis9 ай бұрын
That happened to me almost 10 years ago when I finally figured out what the symbols of differential equations meant. remember solving the same physics problems again and again in that summer at the beach struggling with all the d's and coming up with my own boundary condition problems. Up until then I was performing terrible at math courses. Then, it finally clicked. From that moment I fell in love with math again.
@deanmindock50209 ай бұрын
Sean's enthusiasm and deep knowledge is what makes his talks informative and entertaining. Never disappoints.
@GrouchierThanThou9 ай бұрын
Sean Carroll truly is one of the greatest treasures of science communication.
@littleboy4375 ай бұрын
Gravity is NOT a Force at All Einstein Said Sean is totally lost Very disappointing He says Gravity is a Universal force🤣🤣🤣
@conradleonard9 ай бұрын
This is really one of the best RI lectures available on KZbin! Great stuff.
@as-qh1qq9 ай бұрын
What an accessible lecture! Brilliant exposition - simple, no simpler.
@Haroldus09 ай бұрын
Absolutely first rate explanation . thanks so much. Much better than my professor in 1969. I get it!! I must say I bought Hawkins book about black holes and that made a lot of sense at the time, but this whole subject does require a light touch, otherwise is so easy to get lost in the woods. Your introduction of the various tensors was brilliant. [6 months later - re-watched - got so much more. I cant thank you enough]
@Epoch119 ай бұрын
I would love to see a similar lecture by Sean explaining the Schrodinger equation in the same level of complexity and detail. Not everyone is a physicist but many people have an interest in the equations used and how they are attained.
@maxproph9 ай бұрын
Definitely check out his biggest ideas in the universe podcast series, it's excellent
@anonymes28849 ай бұрын
That'll be the next book (this lecture is based on his latest book in case you weren't aware, with the second book in the series, "Quanta and Fields", due in May of 2024). And as @maxproph says, the books themselves are based on a set of KZbin videos he did over the pandemic called "The Biggest Ideas in the Universe" - a bit less polished but still utterly fascinating (and available now on his KZbin channel). (or if you're comfortable with some not _too_ crazy maths you could also check out either "A Student's Guide to the Schrodinger Equation" by Daniel Fleisch or "The Quantum Cookbook" by Jim Baggott in the meantime)
@kkandola90729 ай бұрын
8:22 to me the fact that gravity acts equally on different mass objects was actually quite intuitive. Not that I’m some genius who intuited the math lol. But the way I saw it, gravity was acting on each bit of mass equally, so regardless if it’s 100K atoms or 100 trillion atoms, each atom is accelerating at the same rate so more mass doesn’t change how fast something falls.
@tahititoutou38028 ай бұрын
The simplest and easiest explanation of Einstein's tensors I have ever seen. Crystal clear exposé by someone who not only masters this stuff but has integrated it into a unified coherent concept. Kudos!
@vitormartins57422 ай бұрын
Sean Carroll is probably the best advanced science communicator in the world because even though he has profound knowledge of the things he's saying, he still manages to retain the perspective of someone who knows nothing about those things. It's remarkable.
@stewiesaidthatКүн бұрын
Sean Carroll has no intelligence on what he is talking about. The earth is not a stationary frame but is in motion around the sun. That's more than his brain cells can deal with. Newton's gravity? Try the 3rd law of motion. Gravity is a Reactionary force, the resistance of the mass to being accelerated by an outside force. There is no gravitational attraction but mass is not an actionable force. F=ma. Acceleration is the actionable force. E=mc. Energy comes from Acceleration of the mass. Not the mass itself. Mass is not an actionable force as proven by numerous drop tests in a vacuum. The earth is ROTATING on its axis as it ORBITS the sun. Two frames of reference. That's why you have 2 tides a day. One being accelerated clockwise and the other, counterclockwise. That's what flat earthers like Carroll and Greene, and Cox, Neil deGrasse Tyson, Stephen Hawkings, Albert Einstein, even Isaac Newton himself. Gravitational attraction is incompatible with the laws of motion. F=ma. Mass or Acceleration. E=mc. Mass or Acceleration. F=ma = ma=ma = m=m and a=a. Mass is just mass. Matter that takes up space.
@thisisfyne9 ай бұрын
A new appearance from Sean Carroll is always welcome! Love this guy
@as-qh1qq9 ай бұрын
He is a phenomenal orator.
@stephenbarrette6109 ай бұрын
I so wanted to get a ticket for this lecture. The RI is such a special place and Sean Carroll is always brilliant and engaging and witty. But it’s great to see the video. Science is cool!
@TheRoyalInstitution9 ай бұрын
We've got some incredible lectures coming up, that can be watched online from anywhere in the world - www.rigb.org/whats-on?type=6
@stephenbarrette6109 ай бұрын
@@TheRoyalInstitution Thank you so much for your reply and the link. I really appreciate that. Yours truly, a 70-year-old science geek!
@AdrianBoyko9 ай бұрын
15:46 I don’t think that “t” is a “universal time coordinate”, as stated in the video. It is just the time axis of the frame of reference we’re working with. The “t” of one frame is, in general, different than the “t” of another frame.
@JRush3749 ай бұрын
More of this, please. It would be great to have a quantum mechanics version of this, maybe to understand the Schrodinger equation.
@mondop52709 ай бұрын
Meow
@jakeduff56778 ай бұрын
He's done on on this channel before exploring and explaining that
@walnutclose52109 ай бұрын
Absolutely brilliant, inspirational lecture. Thank you RI and Sean Carrol.
@cstruble2Ай бұрын
Bravo! What a delight. At some point I noticed I had a big grin on my face. It stayed there till the end, at which point I also had a tear in my eye. I think I have a nerdcrush!
@sethjchandler5 ай бұрын
One of the best lectures I have ever heard. A fantastic mixture of math, science history and humor.
@joyecolbeck44909 ай бұрын
Thoroughly enjoyable.
@Syncoda9 ай бұрын
Sean is the best. I was so happy to see you guys with a new video! Time for me to watch it and I am sure ir’a gonna be epic. Thanks for sharing :)
@allenaxp62596 ай бұрын
This is the best presentation I have ever seen that explains General Relativity in very straight forward manner. Excellent!
@mollylundquist91458 ай бұрын
Whenever I feel discouraged about the U.S. and our mess...seeing/hearing/watching Sean Carroll gives a boost to the spirit. Thank you RI for hosting him...again.
@temptemp5639 ай бұрын
Good to see Sean Carroll again. He used to be everywhere. Then he went quiet. Now he's back.
@ishaansingh69739 ай бұрын
He runs his own podcast: Sean Carrolls Mindscape, where he comes to speak every week.
@TheAlienPodcastKS9 ай бұрын
Heck yeah!!! Always love listening to Sean Carroll.
@MRods479 ай бұрын
This is beautiful, the way Sean arrives at the Schwarzschild radius got me. Wonder how many got inspired here to have a look at the math deeper.
@arunenquiryАй бұрын
One of the most exciting lectures I have seen on youtube! Thank you Prof. Carroll!
@garydecad62339 ай бұрын
Brilliant as usual
@PalmBalms9 ай бұрын
This guy is good
@photografr79 ай бұрын
I began as a physics major in college and immediately changed majors. I eventually graduated with a degree in mathematics, with a 3.95/4.0 in math classes, and loved every minute of it.
@stewiesaidthat9 ай бұрын
Physics is just mathematical nonsense now. Nobody understands physics. Just a bunch of equations. F=ma? What's you frame of reference. E=mc^2? What does it say? Don't ask me, just shut up and calculate is the response now.
@alexwilli9 ай бұрын
This is by far the most beautiful lecture featuring tensors that I’ve ever seen.
@TheWeatherbuff9 ай бұрын
Hi Sean! Since listening to a few of your lectures and podcasts, this stuff doesn't seem quite so scary to me anymore. Keep in mind, I am just a lowly meteorologist... but it's still useful to hear your explanations, which help put these concepts into perspective for me. Question... Is any of this going to be on the test? 😊
@DrDeuteron9 ай бұрын
Weather is pretty hard.
@TheWeatherbuff9 ай бұрын
@@DrDeuteron Yes, it can be. But for some reason I understand weather way better than this material. Which is one reason I enjoy Sean's presentations so much.
@User-jr7vf9 ай бұрын
@@TheWeatherbuff "for some reason"--- the reason is that you haven't been exposed to it enough. Once you get familiar with all the stuff, it becomes easy.
@thomasmogensen19 ай бұрын
What a great lecture and what a great teller he is 👍🏻👌🏻 Great work.
@PlanetXMysteries-pj9nm9 ай бұрын
Your videos have ignited a passion for science and the mysteries of the universe within me. Thank you for being such an incredible source of inspiration.
@Roddy19659 ай бұрын
Very good presenter for general public on a profound subject. That's a real art.
@RubALamp9 ай бұрын
Was there a Q&A for this talk? Could you share it please if that's the case? Thank you! And great talk!
@TheRoyalInstitution9 ай бұрын
So glad you enjoyed the talk! The Q&A for this event is available as a KZbin channel member exclusive here - kzbin.info/www/bejne/qYCYkpeYi8Sgq5o
@RubALamp9 ай бұрын
@@TheRoyalInstitution Got it. Thank you.
@Erik-rp1hi9 ай бұрын
He is great at explaining. Was fun to watch his home series during covid lock down.
@User-jr7vf9 ай бұрын
I remember that
@user-om6kd6mp3r9 ай бұрын
Melina meric 1:25
@user-om6kd6mp3r9 ай бұрын
Maliva meric 2:09
@wafikiri_9 ай бұрын
The mathematical symbology of equations is just a way to avoid long, verbose natural language statements. You can think faster with equations. An added benefit is that new equations can easily follow.
@thomassag9 ай бұрын
Mr. Carroll is on fire in this one. Excellent lecture
@dreamingwolf83829 ай бұрын
So I'm slightly confused anytime someone refers to gravity as a "force", because it was my understanding that gravity is merely an emergent property of the geometry of space-time being warped locally by mass.
@LordMarcus9 ай бұрын
Yeah, it seems like that we call "gravity" has more to do with how we are given the illusion of acceleration through each 3D "slice" or "moment" we experience, even though the universe described would seem to indicate a static 4D spacetime where everything has already "happened".
@BlazeOrangeDeer9 ай бұрын
It's the same way centrifugal force and coriolis force are not technically forces. We still call them forces sometimes because they act like forces if your reference frame is spinning. Likewise, gravity looks like a force if your reference frame is accelerating. A reference frame fixed to the ground is really accelerating upwards, so it looks like there is gravity accelerating downwards. It's useful to think of it as a force because it's useful to use a reference frame fixed to the ground, it matches how we usually experience the world.
@thstroyur9 ай бұрын
The confusion lies within GR's particular framework, and the way Newton is 'carved out' of the geodesic equation and Poisson's law out of the EFE; however, this is far from an universal necessity: yours truly, for instance, has constructed a theory in which gravity is simply viewed as a force in the traditional sense, and yet one can still draw observational conclusions comparable to GR's. Oh, and before you dismiss that as some ramblings from a rando who doesn't know what they're talking about: currently under peer-review - in a fancy journal and everything 😉
@DrDeuteron9 ай бұрын
@@BlazeOrangeDeerthe coriolis and centrifugal forces are just gravity in GR.
@dreamingwolf83829 ай бұрын
@@thstroyur Ooooh neat! What's the journal, I wanna read it when it comes out!
@ryanbaker74049 ай бұрын
I love it any time Sean Carroll lectures, and most especially when he does so at the RI! His wife publishes some of my favorite articles on Ars Technica as well!
@martineastburn36799 ай бұрын
Fifty Five years ago or so We worked with this concept and the nasty calculations with slide Rules and paper. I was predominantly in E&M, but particle was the expanding field. Physics in the 60's was an exciting time. Famous professors talked about basic and advanced physics. So May it Be.
@Albeit_JordanАй бұрын
A lecture in 2023 and the powerpoint isn't in dark mode? Cmon Carroll.
@beardcat9 ай бұрын
Sean Carrol is a genius. I can listen him for hours and hours. Wish I had him as a teacher ❤. PS. Thank you Royal Institute
@AradijePresveti9 ай бұрын
He's a clown that believes there are more than two sexes in humans.
@MaarioneteSR9 ай бұрын
As someone who studied General Relativity from Prof. Carroll's excellent book 'Spacetime and Geometry', it feels like betrayal seeing the (+ - - -) metric signature! And excellent lecture as always!
@DrVolkerRedder4 ай бұрын
One of the best lectures I've ever seen on these topics. Sean Carroll is a great teacher. Thank you very much.
@glarynth9 ай бұрын
Me learning general relativity: "This little maneuver's gonna cost me 51 years"
@themcchuck84009 ай бұрын
Most of the weirdness of spacetime comes from the more basic principle that time (the fourth dimension, at 90 degrees to all others) is imaginary. You still use the Pythagorean theorem, but when you square the imaginary time element, it becomes negative, converting the Euclidean function (a^2 + b^2 = c^2) into a hyperbolic one (a^2 - b^2 = c^2). The principle is simple. The implications are profound.
@alexleibovici48349 ай бұрын
> basic principle that time ... is imaginary It is not, in fact.
@themcchuck84009 ай бұрын
@@alexleibovici4834 It is, in fact. That many don't know or understand it does not negate its truth.
@alexleibovici48349 ай бұрын
@@themcchuck8400 You confuse the nature of the time variable with the fact that a pseudo-Euclidean metrics can be transformed in an Euclidian one by substituting -t^2 with (it)^2
@themcchuck84009 ай бұрын
@@alexleibovici4834 And yet the math works out the same, while my version has explanatory power. I believe the equivalence principle applies to this discussion. If it walks like a duck and quacks like a duck...
@alexleibovici48349 ай бұрын
@@themcchuck8400 > And yet the math works out the same Oh, I see: you don't know what is a pseudo-Euclidean metrics !
@KennethiSlite9 ай бұрын
The rest of the world are really wondering why not Trump is in jail yet. So, for the best for US and the rest of the world, make that happen!
@gordonfraser54489 ай бұрын
Sean Carroll, Brian Greene and Neil Turok are great explainers. Love' em.
@Smitty.Bacall3 ай бұрын
One of the best educators out there always a joy to listen in.
@bronxbrothers1217 ай бұрын
i could sit in Sean's class and listen to him all day and feel like i understood it all when i know i dont.
@deanmindock50204 ай бұрын
Watching Sean do his stuff makes me feel like I am back at UW again. The prof would explain the subject using differential equations making it look simple. But aterwards I would spend hours trying to wrap my head around it what initially was shown to be "simple".
@Mocturnol9 ай бұрын
The legend himself.
@CHIBItheSPARROW8 ай бұрын
"I'm a down-to-earth kind of guy. I like to imagine people going at the speed of light." 🤣🤣
@lb88485 ай бұрын
I propose awarding Dr. Carroll the Sagan prize for science communications.
@LydellAaron6 ай бұрын
Equations are the blueprint, they speak louder and look like pictures and geometry the more you understand them. Thanks for helping me understand this compact notation.
@wayneyadams9 ай бұрын
F = ma is the way we remember the equation and indeed use it, I used to explain it my Physics students by rearranging it. In this arrangement, we add up all the forces acting on the body and if the sum is something other than zero, we know the body is accelerating. In some cases, like a book sitting on a desk the forces sum to zero, so there is no acceleration. To understand the equation a little better, rearrange it to a = F/m. F is the force trying to move the body while m, the mass, is the resistance to the force (inertia). Obviously the greater the force, the greater the acceleration, i.e., the harder you push on the car in his picture, the greater the acceleration. The greater the mass (weight) of the car the lower the acceleration, i.e., it is more difficult to push a more massive (greater weight) car than a less massive car. This is why this equation looks like this, and rearranged gives us the famous F = ma. An important point is that the acceleration is the result of the force acting on the mass, NOT that the force is the result of mass times acceleration as implied by F = ma. ma does not generate force, force acting on mass gives rise to acceleration. 9:00 The reason the mass of the body does not matter is very simple to understand. If you have a body B which has twice the mass of body A, it needs twice the force to have the same acceleration as body A since it has twice the resistance (inertia). However, the gravitational force on body B is twice the gravitational force acting on body A (body B weighs twice body A). So, body B needs twice the force, but gravity acts with twice the force so the mass of the body has no effect on its acceleration. 15:44 My favorite wording of this idea is one I read somewhere many decades ago. "As you travel faster and faster, you trade space for time." Time runs slower (time dilation) giving you more time while space shrinks (length contraction). The coolest thing is that the time gained is exactly equal to the space lost. For example, say you travel at a speed where one day on your spaceship is equal to two days back on Earth. You have doubled your time. However, the distance you measure between any two bodies will be half of what is measured by an observer on Earth. You doubled your time and halved your space. This means both sets of observers will always agree on the speed of the spaceship. The Earthbound observer will say you traveled a distance, d in time t, giving speed = d/t. You will say you traveled 1/2d in time 1/2t, giving speed = (1/2d)/(1/2t) = d/t.
@alexleibovici48349 ай бұрын
> To understand the equation a little better, rearrange it to a = F/m. I found too that this form is more useful in teaching: on the RHS is the cause (acting force), on the LHS is the effect - acceleration.
@andremouss25369 ай бұрын
17:40 there is one famous man missing in that exposé : Galileo Galilei, who was the first one to look for - and to actually find - any kind of "principle of equivalence". Galileo's principle of equivalence is the true basis of Eintein's.
@NandishA9 ай бұрын
Brilliantly explained. Thanks Professor . Kudos to KZbin which enables access to high quality education for free across the globe.
@axle.student5 ай бұрын
I am not a physicist, but I am attempting to study and understand the math to create programmed computer simulations. This placed a lot of the math into perspective for me. Thank you :)
@Testing_123_9 ай бұрын
19:52 You left out converging and diverging at non constant rates...
@der.Schtefan9 ай бұрын
"Ansatz" in this context would translate to "basic approach", not to "guess". "An initial, simplified attempt, which can be worked out or improved upon later"
@tigerhuey40519 ай бұрын
I’ve watched This three times now. It’s amazing to have this come into focus. Can’t wait to buy his book!
@Joseph-dd7iq9 ай бұрын
Sean Carroll's explanation of Einstein's equation makes reading about cosmology more exciting. I was always curious about how such a simple looking equation can be so foundational. ...feels like a grand epiphany. Thanks Sean😊
@schmetterling44779 ай бұрын
That is not a simple looking equation by any means. It just hides the complexity to those who don't know what the symbols mean. He pointed that out in the talk, by the way. Whether it's foundational is not known. It's just one version of an infinite number of similar equations that nature may also follow in the classical approximation. It just happens to be one of the most simple versions of all possibilities. We have, so far, not found any deviations from it, but that's mostly due to the measurement errors that we are limited by. The bigger issue is that it has a distinct thermodynamic form... which may be an indication that gravity is a thermodynamic remnant (rather than a quantum mechanical one). Or that's just coincidence. People have been wondering about that for the better part of a century. The limited success with direct quantization of gravity might be a hint that we are missing a thermodynamic layer there.
@BlackHermit9 ай бұрын
I love Einstein so much! ❤ The secrets of his equations are forever mine, and mine alone.
@robertingliskennedy9 ай бұрын
best hour I've spent in ages sublime chapeau
@true.is.around8 ай бұрын
The big bang means that when there was little mass at the beginning, there may have been a lot of anti-mass. the sum of the amounts of matter and anti-matter must be equal to zero. If the amount of metri is variable, so is anti-matter.
@teugene58509 ай бұрын
You know what? I appreciate Dr. Carroll's willingness to test our ability and willingness to learn these most fundamental equations (regardless of our affinity for... infinity... lol)
@d3vilman699 ай бұрын
Sean's lectures are always entertaining and informative, never makes one fall asleep. Too bad I am not intelligent enough to study particle physics or cosmology else I will be very blessed to have him as my lecturer.
@KetilDuna9 ай бұрын
If you can present stuff like this you are also a hero of that science!
@DeadlyKiss0003 ай бұрын
I came up with a formula for thermodynamic radiation envelopment for interstellar photon retraction. It is ¥ -6 = 5 x speed of light. It works a treat. Nobel thingy prize for sure next year! Thank you
@apngeram9 ай бұрын
Absolutely fantastic! Looking forward to his quantum mechanics talk next!
@Aengus429 ай бұрын
Sean is an excellent explainer. He does imaginary calculus on complex subjects. Zooming in until each point becomes simple enough to explain to enquiring, intelligent people. But people who didn't do years and years in college or uni. So I'm following along, I'm holding quite a few balls in the air waiting for the net that'll catch them and hold them together so I can relax. That is, when I think about the subject again I see a net but I know about the balls it contains. (Sorry, best analogy I could think of to describe it) Anyway, then Sean's voice does this thing that... Well, all I can say is that Sean & Kermit must've been neighbours in their formative years! Great lecture! I failed maths at C.S.E & G.C.S.E. in 19i level but I now have a basic, working knowledge of Einstein's General Theory of Relativity. Thanks Sean, much appreciated :o)