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Physics Stack Exchange users whose comments are worth studying include Lubos Motl and Ron Maimon (now at http://www.quora.com/Ron-Maimon and http://www.physicsoverflow.org/user/Ron+Maimon). Also see http://arxiv.org/abs/hep-ph/0207124 for a review of physics since the standard model.


8h
comment 2 + 1 dimensional gravity as an exactly soluble system
P.S. I just saw Arnold Neumaier's link above - it will help.
9h
comment 2 + 1 dimensional gravity as an exactly soluble system
The last step should explain why the cosmological constant in the geometry becomes the structure constant in the algebra.
9h
comment 2 + 1 dimensional gravity as an exactly soluble system
3) Understand how infinitesimal translations, rotations and boosts, act on the new matrix variable.
9h
comment 2 + 1 dimensional gravity as an exactly soluble system
2) Understand the change of variables, first to spin connection and frame field, then their recombination into the new matrix.
9h
comment 2 + 1 dimensional gravity as an exactly soluble system
1) Understand general relativity in 2+1 dimensions, in a vacuum spacetime, for the three cases.
9h
comment 2 + 1 dimensional gravity as an exactly soluble system
@Ali rezaie I don't have a single reference, that understanding came from many different sources. But you can do it yourself, step by step:
1d
comment 2 + 1 dimensional gravity as an exactly soluble system
I will try to answer it, and maybe I will suggest a rewrite of the question too, but I can't do it right away.
1d
comment 2 + 1 dimensional gravity as an exactly soluble system
DON'T CLOSE THIS QUESTION! Rewrite it if necessary. There is a topic of real substance here, namely gauge theories corresponding to 2+1 gravity with various values of cosmological constant (that's the lambda).
Mar
16
comment How to make a string theory without gravity?
See "little string theory".
Feb
21
comment How do probabilities emerge in the many-worlds interpretation?
Individually, none of these MWI versions withstands much scrutiny as a complete coherent theory. But it's hell to show the overall bad state of the paradigm, because of the diversity.
Feb
21
comment How do probabilities emerge in the many-worlds interpretation?
But the larger truth is that when you probe for details of MWI, as you are doing, you get a dog's breakfast of mutually contradictory claims and attitudes in reply.
Feb
21
comment How do probabilities emerge in the many-worlds interpretation?
That poll is notorious, but that doesn't matter, MWI definitely has some adherents among good physicists, so we could just poll those ones and we'll learn that 100% of that group believe in MWI...
Feb
21
comment How do probabilities emerge in the many-worlds interpretation?
The probabilities emerge through a process technically known as "handwaving".
Feb
8
comment Is it worth reading The Elegant Universe?
A suggestion: read it, and then for a second opinion, read some crackpot theory-of-everything from vixra.org.
Feb
4
comment Does the fact that we cannot exactly solve the Standard Model undermine the validity of QFT?
physics.stackexchange.com/questions/3983/…
Jan
24
comment Dark matter, dark energy
Of all the questions that get closed here, "young future physicists daring to speculate" are a definite sub-type. And it's just bad that people like that should be shut down for daring to speak up, especially when their ideas actually make sense!
Jan
24
comment Dark matter, dark energy
@Kyle Kanos, don't you think these are probably the reflections of a rather young person, encountering these concepts of modern physics and thinking logically about them? And doesn't someone like that deserve better than to be told that their musings are "opinion based" and "non-mainstream"?
Jan
23
comment Dark matter, dark energy
I hope you get some intelligent answers, especially regarding your idea that the appearance of DM and DE is actually due to gravity of virtual particles in space.
Jan
6
comment The fine structure constant - can it genuinely be a random variable?
@Gil Kalai, the answer must be yes, but I need to study / think about the details more, before I can say more.
Dec
31
comment In Quantum mechanics, what is realism?
So state vector projection occurs when someone looks at the wall of Plato's cave... OK.