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seen Oct 22 at 13:54

Jun
27
answered Exercise QFT and CFT
Jun
26
revised What's the distinctions between Yang-Mills theory and QCD?
edited body
Jun
26
answered What's the distinctions between Yang-Mills theory and QCD?
Jun
21
revised Space-time in String Theory
added 94 characters in body
Jun
21
revised Space-time in String Theory
added 232 characters in body
Jun
21
answered Space-time in String Theory
Jun
17
revised Bell states entanglement
added 25 characters in body
Jun
17
comment Where do I start with Non-Euclidean Geometry?
@RonMaimon: I agree with you that unlike QFT and String theory the fundamental facts about general relativity are explained well in some text books, but that does not mean that there are no difficult questions left. To just give one example: Although one knows special solutions to the Einstein equations, there are no general existence theorems. Even a priori estimates are extremely hard.
Jun
16
answered Bell states entanglement
Jun
9
asked Helium Fusion and the Origin of Elements
May
30
answered Crash course on algebraic geometry with view to applications in physics
May
27
comment Derivation of the supergravity action in 11D
@LuboŇ°Motl : Is the procedure of beginning from the free spectrum and adding interactions trial and error, or does it follow some algorithm? I imagine that you begin by postulating some supersymmetry transformation between the fields, compute and find what terms do not cancel, add those and so on. At some point you find that the remainder can be written as a total derivative and you are done. I think that is more or less what was done in the original paper. Given that there are many of those miraculous actions I feel that there should be a systematic way.
May
27
comment Physical Explanation of Being Able to “Think”
Physics alone will probably never give an explanation of why we are able to think. There is the subdiscipline of neurophysics (i.e. the study/modelling of neurons/neural networks in the brain). There are already semi-realistic models for the behaviour of individual neurons and there are methods of simulating networks of those. This is however a far way from understanding how cognitive functions arise from "similiar" networks in the brain. In other words up to now there is some model of the "hardware" but almost no understanding how those lead to cognitive functions.
May
24
comment How can/does calculus describe the movement of a particle?
@OllyPrice I think Khan Academy is overly verbose, there are many good books on calculus. More important than any resources is that you try to learn actively: I.e. as soon as you think you understood something try it out on lots of examples.
May
22
comment Derivation of the supergravity action in 11D
A counting argument can only give a neccessary condition not a sufficient one. I would be satisfied if there were a theorem that stated, that there is a (unique?) supersymmetric action, without exhibiting it explicitly. Ideally the theorem should give an algorithm to compute the action. This would be the situation one is in the case of General Relativity or Yang-Mills.
May
21
asked Derivation of the supergravity action in 11D
May
21
comment Give a description of M-theory your grandmother can understand
Explain M-Theory to a grandmother, who was a graduate student in theoretical physics after 1980 :).
May
20
answered The Faddeev-Popov Lagrangian
May
19
revised What areas of physics should a mathematician study to understand TQFT?
fixed link
May
18
answered What areas of physics should a mathematician study to understand TQFT?