WSU Master Class: Loop Quantum Gravity with Carlo Rovelli

Carlo Rovelli is the discoverer of a theory that attempts to bridge the divide between quantum mechanics and general relativity. Join him as he gives a detailed overview of loop quantum gravity.
This lecture was recorded on May 31, 2015, at the World Science Festival in New York City.
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[@dainezi]

Mr Rovelli is such a great teacher! Thanks for the class!

[@BlackHoleForge]

Thank you for providing this wonderful content online

[@purposebelieve4826]

More such videos and lecture even in live stream would be good!!Cosmos is always fascinating for sure ✨

[@das_it_mane]

Damn this was such a good overview for LQG! Thanks

[@wulphstein]

It would be nice to find some relationship between the expectation value that some particle is located at on the x-axis, and spacetime geometry itself. Did anyone notice if Rovelli mentioned that?

[@abhishekkumarsahu2813]

Very nice explanation sir , thanks for this lacture ❤️

[@Ben102g]

Been waiting for months for you to touch on this! I want all the newest info on loop quantum gravity.

[@MrJayPuff]

Great video!

[@frun]

It's the differentiability conditions in GR, that allow for the spacetime to be made of simplexes, right?(as in CDT)

[@wulphstein]

In order to unify wave mechanics with relativity, you have to use one "thing" that has characteristics of waves and expansion. A water ripple has a ripple which is the wave, and it expands. The big bang expands like a water ripple. In the two slit experiment, there are waves that interfere like water waves. The derivation of time dilation is actually the effect of one ripple moving past another ripple at some velocity v, while both ripples are expanding at the speed of light.

[@abhisheknegi7811]

Mathematics should be included in these talks

[@christinebradshaw9377]

lol

[@shikaarchander320]

Awesome video!

[@bloodyorphan]

Great lectures Carlo, I've been hearing / reading the same arguments from many for some time now. I'm not going to add a critique, there is nothing to critique in what you have said but I will add the following ... SUSY is only one way of creating particle mass in our Universe, any theory of everything has to allow for all three methods of particle creation that we currently observe, That is photonic interference, and Kinematic Compression by velocity or Temperatures over 2000 degrees Celsius. General Relativity postulates that interference is the dominant particle creation paradigm in our visible Universe, which satisfies the SUSY anti particles observed, and observed temperature/compressions of stars and their temperature outputs. So, here's some stuff I have written recently that I believe is pertinent ... Universe Expansion -------------------------------- As for expansion itself, there is a temperature based 2 directional tensor on every particle we have ever observed from plasma photons, up to any atomic weight we have encountered so far. If you consider a deeper weight particle lives at an interference point and is constantly being fed expressed heat from it's immediately (doubled depth and distance) deeper particle, or from ambient temperature at its' depth in the weight space. The deepest particle interferes a new weight and goes the summed interfered temperature C^3 or degree Celsius deeper in its' weight space, the internal "Cavendish" tensors from the particle depth SR monodimensional BB space, pulls the particle back "up" the temperature scale. The particle will shed two "half temperature" photons back up the atomic pipe causing interference in the half distance position of the atomic pipe and the same thing happens at that temperature scale, all the way back to the aperture of the atom and being expressed as a zero degree Celsius photon particle (No velocity at all). If you consider the temperature over distance equation, and add in the redshift of the exhibited photons you realise that the redshift of a "stable" atom by definition on the C^3 scale has to achieve a temperature of zero degrees Celsius as it finds its' position in the "visible space". So instead if the stacked atom we observe, we actually have a redshifted temperature pipet from the Big Bang , too our visible space, which is expressing a Big Bang instantaneous explosive energy at Zero Degrees Celsius and Zero Velocity! This is our visible aperture of space, and it (the Universe) simply started growing when the expression of the BB in its' GR'd observable frame of reference (i.e. expanding at C) , a C velocity time dilated by its' temperature and redshifted by the decreasing to zero degrees aperture space allowing zero degree Celsius photons to "simply appear" in our space, expanding our Universe one photon at a time multiplied the the "Skin Depth Aperture" of our observed universe. Atomic particle formation, is the other side of the BB energy cycle through our space, which means the atoms are slowly in comparison "swallowing" photons that are too hot for the zero degree space and their journey back to the Big Bang has started. When you consider the amount of matter that we observed versus the amount of empty space, it's easy to see why we are still expanding, and likely will continue to do so for ever. I have read Stephen Hawkings' paper "Properties of an Expanding Universe" and everything he postulates and describes fits in to the above theory. (C) M.B.Eringa; S Hawking; 1989 ------------------------------------------------------------------------------ Kinetic Mass and Low Density Plasma Bubbles!! ------------------------------------------------------------------------------ There have been reports of distribution plasma conduits exhibiting Kinetic Magnetic Moments (Causing earthquakes). I believe this is being caused by the plasma bubble being distorted by high magnetic field devices situated around the distribution conduit. This distortion is Kinetic mass and will cause the entire bubble to "recoil" along a line directly from the Magnetic source back to the point temperature of the conduit!. --------------------------------------------------------------------------------------------------- WIMPS - The space/gravitational weak interaction coefficient. ---------------------------------------------------------------------------------------------------- IF the speed of light is a factor of the proton distance into the weight space, and Gravity is flowing towards the temperature point source, this might add weight to why the weight space is on the C^3 scale and not the C scale (i.e. the temperature of the proton exhibits up through this weight space and achieves the speed of light because it is accelerating towards it's weight space). If you take a ratio of the speed of light versus the C^3 equivalent distance that the acceleration from zero to C takes place in, you might have an actual WISC* ratio for all spacial interactions. *Weakly interacting spacial constant, or maybe Frame grabbing constant. Note: This implies space actually can flow in both directions depending on the photonium density, there is some kind of tensor back to the correct weight space. If we can also add in the spacial expansion ratios of switch backs in the corona versus the cell formation size, that NASA has recently observed, we can start to integrate x,y,z compression into the temperature based compression, thus unifying the geometry space with the temperature space time dilation ratios. (C) M.B.Eringa Dec 2021. Skin theory is in progress, here's an intro ... ------------------------------------------------------------------------------------------------------- Skin theory - Quantum Entanglement Teleportation / Replication ------------------------------------------------------------------------------------------------------- There are two types of entanglement. 1. The entanglement for Qubits is information based, which means they are using simple Newtonian energies, like velocity, polarity and spin, and encoding those into one photon and then transmitting it or a primed version of it into two photons and transmitting them, this entanglement is information theory entanglement, and only encodes information at the transmission point, changing any one particles properties by "reading" it, breaks entanglement to all the other photons. (i.e. no spooky action at a distance) 2. The second type of entanglement is a particle skin theory, that postulates all particles are just compressed space skin apertures down to the SR plasma space, the visible aperture is a miniature black hole, and you can create a "Dark" particle like this using temperature dynamics (i.e. two interfered 50Watt lasers makes an electron). Any information that is transferred through this construct is relying on the plasma time dilation/compression being so high that you only have newtons cradle type energy transfer available, but the aperture skin information is in our visible space hence no time dilation for us the observer at the skin, so too transfer information you have to transfer whatever harmonic energy in the Photonium high temperature space that is creating the aperture in the first place, and being Newtonian if you aren't adding energy it will teleport the aperture to another observable space coordinate (i.e. teleportation), or if you add the equivalent energy into the transmitted harmonic the Newtons cradle effect can carry a duplicate of the aperture information to a new physical observable space coordinate (i.e Replication). (C) M.B.Eringa Dec 2021 I need to write a kinematic mass post but the plasma bubble one is the observation.

[@Tinker1950]

There's a well known law of online physics which recognises that however well qualified, however specialised, esoteric or gifted the speaker, that there is always a lonely, unrecognised member of the Dunning-Kruger fraternity desperate for respect and ready to demonstrate how they know better - even without the strictures of formal education, effort or experience they flood the medium with volcanic eruptions of laughable lava. So, as a fellow desperate dunce, let me claim the prize and back-slapping recognition and applause for spotting you - a true Dunning-Kruger exponent. You give us all the deepest occasion for mirth. P. S. I didn't read your diatribe, I didn't need to, I can spot a true loon at a thousand paces.....

[@goboy6882]

@@Tinker1950 In the early 20th century, there were many ideas being shared and rejected. These ideas included electro-magnetism causing Newtons Laws of Motion, electro-magnetism causing gravity, etc.. It seems that many of these ideas are being revisited one way or another. Everyone seems to have some insight that they are trying to share with the world. Many of today's physicists bury their insight in math and jargon. I read these comments in order to understand their insights. This works for published papers as well.

[@Tinker1950]

@@goboy6882 Yet another, keen to demonstrate how ignorance truly is bliss. Quod erat demonstrandum.

[@johnstfleur3987]

I ABSOLUTELY AGREE.

[@BiswajitBhattacharjee-up8vv]

Cool , even very cool when I have heard about something is planned in Antarctica. But the spin foam is truly spin or mathematical structure is open question for my quest.

[@jimmifoulis]

The problem with time space time and is you are looking at it all 2 or 3 dimensions when it is a lot more dimensions

[@ahmedlemin_dah]

brillant

[@HD.369]

Does quantum gravity bend space and time?

[@DocRobActual]

Taking this to be an earnest question, and in the broadest of terms, no. LQG doesn't bend space and time, it's a formulation of gravity that doesn't use time, it uses relations and events to describe gravity.

[@0.618-0]

It's not loop quantum gravity but imagine the earth is floating in spacetime like an air bubble floats in an ocean. Just the constituents of the interaction, of the earth-bubble in the space-ocean and the air bubble in an ocean on Earth as we observe are gravity and bouncy. General Relativistic laws remain the same, pressure tensor and space curvature emerge

[@HD.369]

Future predictions: Feynman graph👍

[@HD.369]

Space time is made up of quanta👌 interesting

[@ahmadthoha5616]

9:10

[@bojanicgoran]

Why have I watched this video. I had hope to learned quantum gravity, but with no success. In his book Mr. Rovelli went fine and then jumped into mathematics which I do not understand. Here he talked about lines and surfaces submerged into what? Quantum mechanic is black box which works well, but we do not know mechanism.Quantum field theory tells us that energy of the field is quantized and predicts mutual interactions between quanta of various fields and Feyman diagrams simplify that predictions. So I do not understand how that diagrams becomes real material lines and between are material surface. What about structure of other quantum fields(electromagnetic and etc.)?

[@DocRobActual]

Which of his books are you referring to? Generally, space-time is quantized at the Planck scale. That's a part of it. Old comment, happy to share with you any understanding I have that you might consider useful.

[@bojanicgoran]

Covariant Loop Quantum Gravity

[@NboOfficialAus]

If this is true wouldn't it mean that pie is finite but we just haven't found the end

[@schmetterling4477]

I can buy pie in my bakery. They also have baguette and donuts.

[@drdca8263]

Pi the number, no, But whatever ratios of lengths or areas or whatever at real physical locations, would I guess only be well approximated by expressions involving pi, and computing an estimate for pi from these kinds of ratios would maybe give a rational number? But I think which rational number would vary depending on what point in spacetime to use as the center? But like, this sort of thing already happens with GR? (not the discretization, but the measured value depending on location)

[@johnstfleur3987]

I AM ZERO.

[@kagannasuhbeyoglu]

Dear Mr. Brian Greene, let him not see or hear 🙋

[@gene8945]

loop gravity is an artificial theoretical construct that has little common with the universe we live in. Good attempt.

[@oldoddjobs]

You're helping!

[@wulphstein]

If you want to discover the warp drive, quantum gravity won't lead you to it.

[@johnstfleur3987]

L.

[@wulphstein]

Quantum gravity is not real physics. It's glamorous mathematics. :(

[@Gringohuevon]

Nonsense..

[@RichardKCollins]

Your intuition is right, but you have not put in the effort to make it into a workable tool that everyone can use. And I mean literally every human. Words and hand waving will not make a theory that people can use. The closest you came in your life is when you made the keyrings. But you did not make a computer animated version that would explore all parameter spaces in the real world, to find things that are useful. Things that help people. Things that are worth spending a whole lifetime on. Words do not move rockets, theories do not move rockets, wishing does not move rockets. You have to design, simulate, test and gather, retest and gather. And hope it converges in your lifetime. Try "hyperelastic solids". That should work for local gravity, and for the web that holds the universe together. Richard Collins, The Internet Foundation

[@chalcedonv6997]

LQG....just another mathematical pseudo mystic trick to attract .... clicks on the internet and myriad of invitations to seminars and online shows.

[@DocRobActual]

Interesting you view the world that way. Carlo Rovelli and Lee Smolin are brilliant and passionate. Clicks are the last thing Rovelli (and Smolin) would care about. And the math works. so....

[@tonyfernandes2342]

A final attempt to make sense with Spacetime, the Big Bang and Quantum Theories … Good try! Space is turning really wavy and Light is turning really black … What a mess! … Come-on, lets get back to square one!