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I used to check every question here but not any more. Physics Overflow, which was built from the archives of a defunct "Theoretical Physics Stack Exchange", seems more promising as a place for advanced physics Q&A.


Mar
31
comment Form of the S matrix for interacting scalar field
Why are people voting to close?
Mar
30
comment 2 + 1 dimensional gravity as an exactly soluble system
P.S. I just saw Arnold Neumaier's link above - it will help.
Mar
30
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.
Mar
30
comment 2 + 1 dimensional gravity as an exactly soluble system
3) Understand how infinitesimal translations, rotations and boosts, act on the new matrix variable.
Mar
30
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.
Mar
30
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.
Mar
30
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:
Mar
29
answered Are The Quantum Assumptions of MBT Theory Correct?
Mar
29
answered 2 + 1 dimensional gravity as an exactly soluble system
Mar
29
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.
Mar
29
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
19
answered Is Physics being formally documented somewhere?
Mar
16
comment How to make a string theory without gravity?
See "little string theory".
Mar
9
answered multiverse fabric of reality
Mar
8
answered Why are right hand neutrinos unaffected by all forces except gravity
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.