Brian Cox - Traversable Wormholes as Time Machines

Brian Cox - Traversable Wormholes as Time Machines
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Physicist Brian Cox explains the science behind time machines and wormholes and whether it's theoretically possible to use traversable wormholes for time travel. Brian Cox gives details about our understanding of time and the seemingly asymmetric passage of time known as the "arrow of time" and why it flow only in one direction.
Brian Cox also explains known paradoxes that might arise when dealing with time travel such as the grandfather paradox.
It occurs when the past is changed in any way that creates a contradiction in causality. For example, if you travel into the past and intervene with the conception of your ancestors (such as causing the death of the parent beforehand), you would be affecting the conception of yourself. If you as the time traveller were not born, then it would not be possible for you to undertake such an act in the first place.
Scientifically speaking, Time travel is the concept of movement between certain points in time, analogous to movement between different points in space by an object or a person, typically with the use of a hypothetical device known as a time machine.
So is time travel possible? Without any cliffhangers, the answer is absolutely, YES...Time travel into the future that is.
However, time travel to the past, is a different story entirely.
Some theories, most notably special and general relativity, suggest that suitable geometries of spacetime or specific types of motion in space might allow time travel into the past.
If wormholes exist, a type 3 civilization on the Kardashev scale could use them for intergalactic space travel and also, time travel.
#wormhole #ProfBrianCox #timemachine
Sources: • Brian Cox explains why...
• Multiverses & Wormhole...
• Is time travel possibl...
"Professor Brian Cox" by University of Essex is licensed under CC BY 2.0.

[@markblackman2542]

Fantastic information , the harder i try to understand the harder it is to be confused

[@sahttr_5097]

I think so too, like Quantum phisics

[@racookster]

If Hugh Everett's many-worlds interpretation of QM is correct, then going back in time and killing one of your parents wouldn't have any effect on your original timeline. You'd just cause a "new" timeline (as if "new" has any meaning in this context) to fork off in which you never existed. You'd be a visitor from a parallel universe in it, and probably stuck there.

[@2000mihai]

Killing one of your parents ????? I wana go back to time in order to prevent my mother death !!!!!! So don t tell me i can not go in to the past ! With latest news in quantum time travel i MUST CAN !!!!! Got it ?????

[@trevorbailey2431]

I believe that time travel to the past is possible and it will be proved true very soon.

[@Givemeproofkid]

😂

[@mjolnir4639]

Thanks Nostradamus

[@2000mihai]

Of course îs posible ! Look at QUANTUM COMPUTER entanglement !

[@bojanmilojkovic3770]

If no one comes back from the future to stop you, how bad an idea can it be ?

[@drsawfish7562]

the past and future can only be viewed,never travelled to

[@SteveJian]

But for this video clip, I'd forget that I have subscribed this channel.

[@dirtyminerapparel]

What was the Philadelphia experiment and can you please use it in a sentence. We are traveling forward in spacetime right this second.

[@user-jc2we4sn1i]

Should Biran Cox portray "Dr. Who" for BBC?

[@susanogranados5892]

If time travel is possible then everything else is possible! Simply, not everything is possible!

[@frankarevalo5343]

So if someone traveled to the past then that time traveler’s past is the future from which he came. And at that time to which he traveled the other people there would regard his “past” as their “future.” Does that make any kind of sense? If so, are there any consequences scientifically or philosophically? Just wondering if there are any other ways around the grandfather paradox other than just postulating that time traveler would be somehow be prevented from killing his grandfather. Is it possible he could kill his ancestor without eliminating his own existence at that past point? And what about the notion of the block-universe or eternalism? If the past is just as real as the present how, if at all, would it be possible to change the past?

[@susanogranados5892]

I understand exactly what you’re saying… this time travel idea is just not possible! There’s so many errors in the idea… we human have this beautiful functions and abilities in the brain but just because we can think it or imagine it doesn’t make it possible!

[@paresmohan]

If time travel possible in theories of Einstein and Stephen hawking it automatically means that past , present and future exist simultaneously ( means that beginning of universe and end of universe happening same time , right now )and that means dramatically that the universe have no end , it's static ( hence no big rip , no big crunch or no cold death) because it's like stuck in time loop , for example what if we are the sons of those encestors who are born in the end of the universe and came back to middle age of the universe so they can safely save their seeds before universe ended , and this loops becomes infinite

[@nrolling7192]

Time travel into the past seems to violate the paradox of the same dimension but could it be possible to time travel into the past of a different one?🤔

[@jeffs6090]

I've always felt that the moment you travel to the past, it immediately creates a different dimension or time line. This eliminates the grandfather paradox and others. You could kill your grandfather before your parents are born, but this is now in a different time line or dimension from which you came. So now, you and your parents won't exist later as you know in this time line but still do in the other time line which is why you can still roam around after killing your grandfather because your matter came from the time line where you exist. Now, being able to get back your time and dimension might be a different story. Maybe you can't do that, it's probably going to be a one way trip, and you live out your life in the new time line/dimension. It would make more sense to do something more pressing than killing your grandfather, obviously, like killing Hitler or knowing the billion dollar lottery numbers the drawing before it was hit. However, that time line will be just for you to experience. The original time line will go on in that time line as if nothing is different (just without you), but you and the other people in this new time line will experience the change that you made happen and never know anything different. However, if you go back recent enough to where you exist, you may have to kill that you so you both don't exist. Especially if you're doing it for the lottery reason.

[@nrolling7192]

@@jeffs6090 exactly, I feel like that's the only way it could be possible and won't conflict with your own timeline, that movie "everything, everywhere all at once " went over this theory with the cris/crossing Multiverses.

[@susanogranados5892]

Time travel is not possible! That idea only exist in the human mind! Just because we humans have the ability to think and imagine stuff doesn’t mean is always possible!

[@John-ir2zf]

@@susanogranados5892 only partly true. Forward time travel is very possible, even with today's technology. If you sent a ship to orbit close to a black hole for 2 years (two years for the ship and crew), when they returned to earth many many years will have passed on earth but the ship and crew only aged 2 years. Those people would have technically traveled in to the future. Go backward creates FAR more problems than was covered in this video and is impossible without the addition of unknown, possibly non existent matter.

[@susanogranados5892]

@@John-ir2zf in theory (mathematically) it does..! In real life, mathematics doesn’t always work out as expected!

[@4dmost991]

What if the granpa paradox is like quantum suicide?

[@theMightywooosh]

Cool

[@forest2150]

Nice! Your videos should be seen by more watchers. Can I repost your channel without changing anything on the clean platform named Ganjing World? Thank you!

[@Ghozer]

But no, we generally overthink time travel.. if you go back and prevent yourself being conceived, you already have been and already exist - so you will continue to do so.... If you travel to the past, then you are doing just that.... you travelling to the past is part of your future, so you will travel there, or at-least a universal representation of, changing anything doesn't affect anything else, because those things have already happened, and already exist to you, regardless if you go to the past or not...

[@susanogranados5892]

In conclusion, time travel is simply not possible!

[@sahttr_5097]

I think it's possible travel to the past, it's just we don't know how

[@jimgraham6722]

Thanks, you can certainly observe the past, you do this everytime you look in a mirror. Intervening is another issue.

[@theobserver9131]

I have this nagging thought that if we could find some sort of anomaly in space that functions as a mirror, many light years away, we could look at its reflection and observe our distant past as if it were the present.

[@Metal73Mike]

You technically ALWAYS observe the past, not just when looking in a mirror. Photons will always need a certain time to reach your eyes, no matter the distance.

[@davidkiss6624]

First step; The Space-Time Young-modulus from David Izabel! 🤓

[@broskidigs149]

How would we create a wormhole next to Earth without it sucking Earth into the wormhole and it destroys Earth, just like how a black hole directly next to Earth would? (Aka why wouldn’t Earth fall through the wormhole immediately if the wormhole was created near it, would the wormhole suck anything near it in like a black hole or stay vacant and wait for something to come in? (I just feel like a wormhole would probably destroy Earth due to warping space too harshly but that’s just me…so if we could create a wormhole, maybe we shouldn’t…) What do u guys think?

[@blueskies6367]

Tbh I’ve never thought of that LOL

[@yeetleet2368]

Omg this is the moment where I realize we left out a huge portion of this wormhole theory.

[@aidanchavez1135]

@Broski Digs ur a genius my dude.

[@bloodtopaz8816]

I'm sure there would a lot of math involved but they would figure out a safe distance where a wormhole could be opened and used.

[@broskidigs149]

@@bloodtopaz8816 that would be dope

[@denstontjackson6279]

Even if even if time travel is possible using a wormhole or a black hole we haven't designed anything that can withstand pressures of the bottom of the ocean much less pressure of a collapsing star or an unstable star black holes over gravitational pull that is where we stronger than that of the gravitational pull of a celestial body such as a planet so how do we survive in such an environment

[@kurtasee2314]

What if you can travel so far into the future that it effects the past. Think there's a Futurama episode about this lol

[@pablomorada7199]

What if Dejabu is time travel

[@shmackydoodRon]

It’s much more fun as a sci-fi writer to use the Novikov self-consistency principle. You can’t change the past because you didn’t, and everything you do in the past is inevitable, because it happened.

[@kaellum4260]

Kewl to think I beat Brian Cox to this.

[@jeffs6090]

We're already time traveling into the future....at one second per second.

[@theobserver9131]

True that, but we also have the ability to change that velocity. We can slow down to a crawl, or we can speed up. Every time we change our velocity through space, or our proximity to massive objects, we change our velocity through time.

[@Leon-hv4tf]

Sean connerys back handed remarks

[@gaemlinsidoharthi]

Did the narrator say _casual future_ and _casual past_ instead of _causal future_ and _causal past?_

[@armpitwigs]

Yep, got me too. Thought I'd heard a new term relating to the time-line of events!

[@philshorten3221]

Surely travelling into "The Past" by definition renders your destination no longer "The Past" because the definition of "The Past" must include "where stuff was" like 1 hour ago the hand on the clock was say 4 now its 5 and the position of the Earth relative to the Sun was different. This applies to every particle, photon etc. So surely regardless of the maths or theory of physics, anything that tried to go "back in time" would either create a different time thread or loop OR crash into an un-altererable and therefore impenetrable configuration of where "stuff".

[@arcadealchemist]

time travel would be more like booting up a save state of your current reality and the individual will advance along a new path. it's not impossible to do it's just HARD to Prove. Quantum tunnels would be a way to prove it but essentially it would also allow for Euclidian space time warping which could have MORE practical applications such as FTL and Space compression. i mean we could already be living in a universe where space time is only relative to the order on Earth and the chaos of the heavens

[@williamgorsich150]

Looking forward is possible and infinite,,the past is gone and finite, to know the past you can try and alter future but is difficult d ok to mitigating factors and more

[@seriousbutfunny2]

Spooky Action at a distance is real.

[@YouTubeH8sMe]

No paradox if You travel to past in another universe. Or here, if You did not originate from this universe.

[@user-jc2we4sn1i]

Nuclear isotopic materials and equipment are restricted not so much for hysterias about weapons since real main reason is they want to keep you from escaping to other dimensions of parallel universes and FTL to other galaxies.

[@markblackman2542]

I suppose if you can only travel forward in time , then you can't go back to where you Started ,keep going forward for ever ?

[@andressolar517]

is it possible NOT to travel through time?

[@jeannytse2654]

Yes, when you die , you stop traveling.

[@fluentpiffle]

‘Time’ is really the motions of existence, so the answer is…. No!

[@andressolar517]

@@fluentpiffle then it's not even possible not to be a timetraveler.

[@emilyhopemeechem4183]

Time travel to past advice: You can possibly help or save other people Do not kill grandpa when he was a lot younger!

[@vryusvin3905]

Just my thoughts, BUT- if time travel to the past is possible (which I do not think it is, even with the "branching" hypothesis), then we would live in a very different universe. Think about all the others ideas out there about alien races that evolved to technological significance thousands or millions of years ago. If any one of them, just one, could travel to the past- then they probably would have by now, and changed things. My more important point is this: If a vastly advanced society could travel to the past at will, then what would prevent them from shuttling matter or energy from one point to another within time? How would that affect things? What if, at the end of the universe from heat death, those aliens used time travel to funnel in massive amounts of matter so that the universe changed from heat death to stability or the big crunch? I just think the problems caused by travel into the past through normal, stable means is not possible. At least, not possible unless you have more energy than within our entire universe. And I don't think any other species in the universe has done it yet.

[@space1commander]

I love the cockpit of the space ship and it crew astronauts and the aliens. Our minds are in the caveman stage and it does not have the ability to understand the Universe and it wonders.

[@2000mihai]

😂

[@antonio12544]

Everyone wants to know whether past travel is possible but nobody wants to know if we are able to travel to Macdonald’s and get a working ice cream machine. It could contradict Einsteins relative theory but it could be possible to get a macflury.

[@eddylebrun9717]

So does that mean if I slow down my watch does that mean I slow down time so inferior I live longer

[@bbouchan1]

So the question I always ask is.....If we are travelling through time how long does the present last for....1 sec....1/2 sec....a nano second??....It must have a measurement.

[@John-ir2zf]

Depends on the "reference frame".... to the person traveling FORWARD (the only direction possible) their seconds would pass just as normal, one second at a time. To a observer watching the travelers clock somehow, the seconds on the clock would take years to pass. That's why ANY talk of motion at relativistic speeds has to be based on either the relative frame (the person moving) or the inertial frame (the non moving observer) because different frames show different qualities.

[@hyper_dragon6302]

I wish Adolph best of luck 🍀 to save my foster father

[@robertmolldius8643]

Traveling back in time goes against the first law of thermodynamics.

[@2000mihai]

Ýeah, sure, but quantum mecanics, quantum entanglement are above !!!

[@Johndoe-ob1]

What's the math that says a wormhole is a time machine too the future seriously

[@yeetleet2368]

Basically nothing. It’s probably just wishful thinking.

[@marrz8244]

🤔✌️🤘

[@bathin813]

There isn't one. But even if there is an equation for that doesn't mean it can be reality.

[@mse501]

Einstein-Rosen bridge. Theoretically proven for almost 90 years. No flaw in the solutions, but no experiment to support that.

[@hunterwitt2343]

General theory of relativity

[@burt3498]

Awesome! Why are "The Grey" aliens always nekkid? Put a space suit on already hahahaha!

[@eerotarik2567]

I suspect whenever you travel in time, you don't do so in your own timeline, you move into a new multiverse(as you do anytime you make a decision - quantum physics). Therefore it would be possible to move forwards or backwards in time as your movement does not affect your multiverse of origin - 'you' are no longer there. And perhaps, as every single point in every multiverse in both time and space has a specific co-ordinate, perhaps one could jump to any specific co-ordinate if you knew how to do that.

[@michaellillis9897]

It seems to me that the entire notion of time travel to the past comes from a basic misunderstanding about what the equations of physics actually are. Maths describes our understanding of the universe, it isn't the universe itself. 2 apples plus 2 apples gives you 4 apples, so 2+2=4 is valid and useful, but it isn't reality. mathematically it is valid to subtract 10 apples from both sides, but I cannot have negative apples no matter how many times I prove that I can with maths. In the same way I find it absurd that the past has to "exist". The past is just the way things were, and you would need to entirely reverse causality to go back to any previous state of the universe.

[@AlmostEthical]

Even if you could go back in time you would have to also move in space or you would end up floating in space, with the Earth millions of kms away. Not to mention the travel of the sun and the galaxy.

[@justdata3650]

If I was to make a conjecture on time travel I would say that: "Since we have no choice but to travel into the future (time stops for no man as they say), that to maintain symmetry that you cannot travel into the past", drawing on of course just how much symmetry there is in physics acknowledging of course it's not a guarantee or law, just an observation that seems to hold true an arguably unreasonable amount of the time.

[@michaelstary3463]

...we can only see in three dimensions. Whats a hole in 3D? A sphere. If the wormhole takes us to another dimention, we probably wouldnt be able to see it.. like a dog that can only see in two dimensions... however the physical aspect would remain. It would probably just look like bright lights and colors.

[@kurtasee2314]

Would have to have some intelligent single cell organism to be able to go through the wormhole

[@Aum_shantishantishanti111]

Are you talking about me again . Theoretically.

[@Molatov_Cockatiel]

Time flies like an arrow. Fruit flies like a banana. - Groucho Marx

[@thedriver133]

😂😂

[@thesoundsmith]

"If wormholes exist..." If you want a wormhole big enough to handle your time/spacecraft, isn't that up to YOU to create? You have the parameters, you have the collider resources. And when you're totally stuck - ask Elon. 😉

[@thesoundsmith]

...The Quantum Borer Comp[any...

[@stefanmajzel6963]

Star gate 😅😅😅❤❤❤ koeficient 2 konštanta vesmíru je v-1 počiatočná ďalej rýchlosť hmoty je einstanova teória v max. Dálej skrátenie priestoru a prenos hmoty cez ňu do iného času je Ne -1 neutrál kde nekonci musíte zadať východiskový bod exit z Ne -1 +1 čiže mame hviezdnu bránu 😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅😅

[@pacmech100]

It sounds like Jim Al-Khalili has done much of the narration,.

[@John-ir2zf]

This video leaves out the part where physicists can distort a Penrose diagram however they like to achieve a closed world line.......that DOES NOT mean that we can ever create such a curvature in spacetime.

[@seanspartan2023]

If we discover a dark energy particle wouldn't that be a candidate for exotic matter? Dark energy acts as a repulsive force, counteracting gravity. Isn't that a property of negative mass?

[@greensombrero3641]

stewie did it

[@richardsylvanus2717]

Aliens!

[@Metal73Mike]

"casual future" 😂😂😂Epic fail, but funny AF

[@princeindrajitlawlaha7027]

! 💝 💯 👏 🎉 🙏 🚀 👍 🤖 🎅 ✝ 🌝 !

[@eddylebrun9717]

I have to say no we live in time

[@MasterDayTrader]

lol, did you say Kardashian scale?

[@theobserver9131]

Nope.

[@epicswirl]

Didn’t watch the video but I know mathematics he probably said Cartesian.

[@myphonyaccount]

You can on psychedelics.

[@ChrisHall123]

Black holes are time machines into another universe where we exist but in another state.

[@brettemurphy]

Sorry but I had to click stop when you pronounced "Causal" as "Casual". This video is indeed a casual effort.

[@christinablakley7261]

No.

[@glennschiffer1742]

a lot of speculation

[@HugoTron]

Anything is possible, the mind is the trigger and the blocker in addition the body is the action tool

[@Richard-ox6zk]

no, I did not like this video. It only shows 'maybe possible' stuff. Useless.

[@arcticbliss2330]

Look up to the night sky and select a star as a destination. Can any human reach this star by just walking few steps? General relativity explained a mechanism to contract huge distances into few meters. Albert Einstein called this mechanism 'bridges' in space-time. Today scientists call them wormholes. A wormhole acts as a shortcut connecting two distant regions in the universe. God gave this method of transportation to his angels throughout the universe. The Quran calls them 'Ma'arej' (معارج) and describes how angels use them for long distance travel. Today Muslims know that these 'Ma'arej' is what scientists call wormholes. Physicists know how a wormhole works but have never actually used one. Do you remember how a frictionless roller coaster works? That is, you start high and slow then you go down and fast but when you come back up again to your previous height you return to your previous slow speed? Well, the wormhole is the most efficient roller coaster you can imagine. Energy is not required to move through the wormhole, that is, you can simply switch off your rockets. Gravity accelerates you and pulls you through and then expels you the other side. You will feel like being swept by waves at the beach; nothing more. On your way through, gravity causes your clock to run slower and your ruler to shrink. Distant observers see you accelerating to relativistic speeds; as a result, your energy (and mass) increase dramatically in their view; but when you get out the other side everything returns back to normal (your clock, ruler...). Quran 70:3-4 (a penalty) from Allah (who owns) wormholes [Ma'arej in Arabic] The angels and the Spirit ascend to Him in a day, the measure of which is fifty thousand years. Any object passing through this wormhole will also experience this same time dilation (one day inside wormhole vs. 50,000 years on Earth) and not just those angels. This time dilation does not say how long it takes you to cross the wormhole, it just says that when you pass through the wormhole you age by this ratio. Muslims also believe that wormholes are not strictly for the use of angels. Their prophet used a wormhole once in the 'Israa & Mi'raj' (Mi'raj معراج is singular of Ma'arej). Any object passing through this wormhole will also experience this same time dilation (one day inside wormhole vs. 50,000 years on Earth) and not just those angels. This time dilation does not say how long it takes you to cross the wormhole, it just says that when you pass through the wormhole you age by this ratio. Muslims also believe that wormholes are not strictly for the use of angels. Their prophet used a wormhole once in the 'Israa & Mi'raj' (Mi'raj معراج is singular of Ma'arej). Quran 15:13-17 They do not believe the Message, like those who preceded them; Even if We [Allah] opened upon them from the heaven a door and they continued passing through it they would say 'Our sight is intoxicated, rather we have been bewitched'. It is We [Allah] who have made towering structures in the heavens and made them beautiful for beholders. And We protected them from every evil spirit accursed. Here they wouldn't believe their own eyes thinking that what they see is not real. They wouldn't believe that they got to those heavenly structures by simply walking few steps. But God insists that what they see is real and not illusions (that is, they really got there). The Quran says believers will go to Paradise via wormhole; however the doors of those wormholes will not open for disbelievers. Quran 7:40 Those who reject Our revelations and are too arrogant to uphold them, the doors of Heaven will not be opened for them, nor will they enter Paradise, until the camel passes through the eye of the needle. Thus We repay the guilty. "Camel passes through the eye of the needle" this is the length contraction inside the wormhole. The Quran describes length contraction, time dilation and transportation but they are strictly characteristics of wormholes.

[@Stringandsealingwax]

Unspeakable drivel.

[@upupuptheziggurat.liketysplit]

I'm not an expert, but the way I figure it, it is strange for how often the word relativity gets bounded around. Lets take the wormhole example. Sure from a specific point of view, it messes with time and relativity, but if one existed and you used it. You still always always exit point B, after you have entered, there's no getting back to point A before you went. Though it may very well not look this way to a separate third party if it remained fixed, but as soon as third party starts investigating, this will collapse. It wont mean you never travelled the wormhole, just third party probably is never going to find you again. Anyone still reading? well, time travel; grandfather paradox; I've travelled back in time and I am going to going to shoot my grandfather in the head. At that specific point in space-time, if it is possible to be there again, the moment the bullet is fired, some of my historical timeline should collapse. I would argue, as outlined above, it would still happen, it would just happen in a way under our perception, like the space wormhole and light example is over ours, we cant see faster than light can we?

[@CovertMessiah]

Time travel, into The Past, would mean, that time is reversible. If so, then, if one, could isolate ones self, from Space-Time, and reverse Space-Time, externally, and then reenter Space-Time, after having been rewound. Easy Peasy... You just need to find a way to warp Space-Time, into a vortex extending into, and beyond the Higgs Field sub-matrix, so that it reaches, and connects with GODs' remote control, and hit the rewind button.

[@atmanbrahman1872]

Bullshit.

[@theobserver9131]

Sounds like something you can relate to.