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Mar
30
reviewed Approve What is the problem with quantizing GR in the Effective Field Theory approach?
Feb
17
comment Quadrupole and Multipoles in Physics
It's not Taylor expansion. It's expansion in the basis for function space given by spherical harmonics.
Feb
11
comment Why is the detection of gravitational waves so significant?
Also, it's a breathtaking technological achievement.
Feb
9
awarded  Guru
Jan
21
awarded  Yearling
Dec
23
awarded  Necromancer
Dec
17
comment What, to a physicist, are instantons and the Donaldson invariants?
The point of constructing the Euclidean path integral is that it gives you a way of taking expectation values of observables. There is a certain class of observables in N=2 supersymmetric Yang-Mills theories for which the path integral degenerates to an integral over the space of instantons; the integral over the fluctuations around the instantons doesn't contribute to the expectation value. These expectation values are the Donaldson invariants.
Dec
17
comment What, to a physicist, are instantons and the Donaldson invariants?
This is a great answer, and I encourage you to extend it all the way to the Donaldson invariants. In case, you don't feel like doing so, I'll add the following terse explanation.
Dec
17
answered In M theory, what size are the branes/D branes?
Dec
16
revised Wick rotation in field theory - rigorous justification?
added 176 characters in body
Dec
11
answered Nahm's theorem and related with SYM ;other theories
Dec
10
answered Electro magnetic duality, Strong weak duality and N=4 super Yangmils
Dec
8
comment Electro magnetic duality, Strong weak duality and N=4 super Yangmils
Electric-Magnetic duality is a large subject. Have you tried reading the original Montonen & Olive paper?
Dec
3
answered Non-abelian gauge covariant derivative acting on non-algebra-valued quantities
Nov
29
answered Does quark confinement imply indivisibility of quarks?
Nov
29
comment Does quark confinement imply indivisibility of quarks?
@innisfree I agree with the ideals you are promoting, but you look a bit strange lecturing a scientist about what scientists are like.
Nov
13
answered Why is this proof that all $\overline{\psi}\psi\overline{\psi}\psi$ interactions are trivial incorrect?
Nov
13
revised Why is the Yang–Mills existence and mass gap problem so fundamental?
added 139 characters in body
Nov
12
answered Why is the Yang–Mills existence and mass gap problem so fundamental?
Nov
10
awarded  Good Answer