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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.


5h
comment Questions about the formalism of Quantum Mechanics
Anyway, I was going to say: Bohmian mechanics is actually easier to explain that quantum mechanics, because it's still just a mathematical state evolving over time. Quantum mechanics has observables and operators and expectation values, the same or similar mathematical formalism takes on different and more complicated meanings.
6h
comment Questions about the formalism of Quantum Mechanics
For some reason, comment editor is stripping OP's name from previous comment. @David
6h
comment Questions about the formalism of Quantum Mechanics
you've relabelled the question as about quantum mechanics, but question 5 is definitely only Bohmian, and questions 4 and 6 have a quite different character if they are read as being about quantum mechanics...
18h
comment What happens in a universe with only two electrons?
I think I saw, in a comment that may have been deleted, @Sharon Salmon say that many of the answers about quantum reality were manifestly statements of opinion rather than knowledge. I just wanted to establish that it is true of the responses here too.
18h
comment What happens in a universe with only two electrons?
@Asher I see from one of your answers physics.stackexchange.com/questions/159308/… that you think electrons don't have a location until they are measured; and I see from your profile that you consider yourself an amateur physicist at best?
1d
comment What happens in a universe with only two electrons?
@Asher, but do you think that the electron has a definite position or definite momentum before you measure it?
2d
comment Physical meaning of quantum interpretations
Apparently based on this Physics Overflow question physicsoverflow.org/29793
2d
comment Are atoms bad and good?
Some atoms, like carbon, are better at making life. So you might call them good if you think that is good. But almost all types of atom have a use somewhere in life. Toxicity is contextual. And even death is used by life (e.g. apoptosis).
Apr
20
comment Where is all the Dark Matter? Theoretical Question
Dark matter is usually thought to form a big sphere around a galaxy, called a halo. The DM particles are everywhere inside the sphere, all the way through. They aren't hiding, but they don't interact much with visible matter, except via gravity.
Apr
9
comment why does string theory require holography?
OK! Holography does help with calculations. Sometimes the alternative description it offers is the only known way. I'll think about what to say about this.
Apr
9
comment why does string theory require holography?
That's like saying "why does arithmetic need prime numbers?" The existence of prime numbers is not a starting point, but it follows logically from the definitions of counting, multiplication, etc. The point is that string theory was not designed with holography in mind, it was built step by step according to other criteria, but the resulting theory turned out to have the holographic property.
Apr
8
comment why does string theory require holography?
@John Peterson - Sorry, I don't follow... Holography is not a choice in string theory. You can't have string theory and then decide to add holography, they believe holography is already implied. But it took several decades before this was discovered to be an implication of the theory.
Apr
6
comment Form of the S matrix for interacting scalar field
@Amara, if you ever see this- try asking at Physics Overflow.
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: