Quantum Gravity In 8 Minutes

Lee Smolin discusses loop quantum gravity, string theory, and condensed mattered.

NOTE: The perspectives expressed by guests don't necessarily mirror my own. There's a versicolored arrangement of people on TOE, each harboring distinct viewpoints, as part of my endeavor to understand the perspectives that exist.

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#science #physics #stringtheory

[glamdrag]

The video is about two different approaches to quantum gravity: string theory and loop quantum gravity.

String theory is a theory that tries to unify all the forces of nature, including gravity, by describing all the elementary particles as tiny vibrating strings. Loop quantum gravity is a theory that tries to unify all the forces of nature by describing spacetime as a network of tiny loops.

The speaker of the video, Carlo Rovelli, is a proponent of loop quantum gravity. He believes that loop quantum gravity is a more fundamental theory than string theory, and that it will eventually be able to explain all of the phenomena that string theory can explain, plus more.

One of the main arguments in favor of loop quantum gravity is that it is background independent. This means that it does not require a fixed background spacetime, such as the Minkowski spacetime of special relativity. String theory, on the other hand, does require a background spacetime.

Another argument in favor of loop quantum gravity is that it is more general than string theory. String theory is only applicable to a certain type of spacetime, called a Calabi-Yau manifold. Loop quantum gravity, on the other hand, is applicable to any type of spacetime.

However, there are also some challenges facing loop quantum gravity. One challenge is that it is not yet as well-developed as string theory. String theory has been around for much longer, and there has been much more research done on it. As a result, string theory is better understood than loop quantum gravity.

Another challenge facing loop quantum gravity is that it is not yet clear how to recover the results of general relativity, the current theory of gravity. General relativity is a very successful theory, and it is important to be able to recover its results from any new theory of gravity.

Overall, loop quantum gravity is a promising new approach to quantum gravity, but it still faces some challenges. It is not yet clear whether loop quantum gravity will eventually be able to replace string theory as the leading theory of quantum gravity.

[gwills]

7:55 I love his supposition that time is fundamental and space is not. It runs so against human instincts which is exactly why it’s a great place to look

[brandonb]

Nice! Now add an infinitely collapsing, fractal toroidal field around the “equator”. This could be what is manifesting MAGIC within the system.
Thank you Dr. Smolin and Curt!✌🏼😊

[jjcooney]

To sit in this room for this interview would be quite a moment.

[tedgunderson]

I can’t keep up, thanks for the opportunity though.

[richardfinlayson]

I just clicked on this because the thumbnail background looks like a torus, im obsessed by the torus since i saw one in my head on psychedelics, it blew me away, it felt like someone was trying to tell me something, lol.

[JAYMOAP]

The explanation at the beggining of frozen magnetic and electric field was nice. He could of expand more on the confinement section I am sure more people would of appreciate it. Was nice interview regardless

[Paul_Marek]

In your thumbnail the unoccupied space around the plasma is actually a toroid. Awesome.

[lukekowa]

How to Spend 20 minutes watching a 9 minute video haha then the 🤜🤛

[vanikaghajanyan]

7:58 A full-fledged representation of the concept of time, it seems, can be the history, the age of the system under study.
"This new type of universe in its other properties resembles Einstein's cylindrical world." (A. Friedmann, "On the curvature of space", 1922).}
Developing Einstein's hypothesis of a cylindrical world, Einstein's theory of gravity "migrates" into phase space where k*=[1-g(00)]=πr/L, L is the length of the phase trajectory: L=πct’, t’ the age of the system. It is clear that then, variably accelerated motion-evolution of the system along the phase trajectory: |a|=g=πc^2/L=c/t', where g - field strength; where it follows that oscillations of the phase trajectory cause relative 4-accelerations of test bodies (as well as displacement along the time coordinate).
Due to this, it is quantized, and predicts a new physical effect: w/w(pl)=k; expression for gravitational radiation from a test body, where w - the frequency of the quanta of the gravitational field [and finally writes the quantum expression (as vibration field) for the Newtonian gravitational potential: Ф(G)=(-1/2)[Għ/c]^½(w) =
The gravitational field is characterized by a spontaneous flow: J(G)= (v'/π )(1/4π) g^2/G, where v'/π- phase velocity of field (time) evolution: v’=r(pl)w.
Can be tested experimentally in the laboratory at the moment.

*) - As a fundamental theory, GR has the ability with just one parameter: r(G)/r=k to predict, explain new physical effects, and amend already known one, where the parameter r(G)/r is a measure of the deviation of the metric from the pseudo-Euclidean one.
Photon frequency shift in gravitational field Δw/w(0)=k; the angle of deflection of a photon from a rectilinear propagation path =2k, the Newtonian orbit of the planet shifts forward in its plane: during one revolution, a certain point of the orbit is shifted by an angle =3πk, for a circular orbit (eccentricity е=0); in the case of an elliptical orbit - for example, for perihelion displacement, the last expression must be divided by (1-е^2).

[richardfinlayson]

This guy is the Joe Cocker of physics...sorry not trying to be offensive, i love JoeCocker.

[billschwandt]

I wrote a paper the other day that was inspired by this video about using the lorentz effect to explain gravity. It's on my subs tack if you would like to read it. Loop quantum gravity and his explanation is what kicked the idea in my head.

[sunroad]

It cannot be right that our outgoing 20th Century physics has discovered the bulk for how the universe works but failed to acknowledge the fact that "No matter how highly mechanised and fossil fuels self-powered, fossil fuels extraction requires a number of people - as if the process is executed by hands using buckets and ropes - by physics".
And, today, this number is 8 billion people - working flat out 24/7 - strong - including Lee Smolin and his peers.
20th Century physics has been no more than a tool to delay the realisation by humans of that:
"In any system of energy, Control is what consumes energy the most.
Time taken in stocking energy to build an energy system, adding to it the time taken in building the system will always be longer than the entire useful lifetime of the system.
No energy store holds enough energy to extract an amount of energy equal to the total energy it stores.
No system of energy can deliver sum useful energy in excess of the total energy put into constructing it.
This universal truth applies to all systems.
Energy, like time, flows from past to future"(2017).

[ltandrepants]

Does he have als or something causing his movements?

[djclarity]

lol if I become a patron will you please get another tripod

[paaao]

After many years of studying electrical processes and phenomena, as well as quantum physics. I'm %100 convinced that the reason modern day science is off track is because they mostly fail to treat space as something that truly is emptiness or nothingness. Meaning, space can give rise to time and distance scales, but time and distance, like space, are not real things. They are the measures of the inbetween nothingness of actual vibrating matter.

The magnetic field is very intangible much like space. You can't hold it, you can't create it, see it, etc... It's also not something that performs one action. When it constructively interferes with itself, it gets stronger at pulling, but it also gets stronger at repelling. Large massive objects like the planets orbiting our sun are also pushing and pulling. If curved space were %100 accurate and that's what gravity was, our solar system would have collapsed into the sun or never been formed long ago. There's more to it than just the attraction.

[mayukhsen]

The good gentleman burns a lot of calories while talking. All that head movement.

[seraph]

@8:10 reverse it.. (?) 👍!
It felt atheistic..

[Nonconceptuality]

Can you please point me to the place where the explanation is?

There are NEVER any conclusions to these discussions.

I know why

[maeton-gaming]

But what is a field... nobody can answer the elephant in the room.