user avatar
user avatar
user avatar
Siva
  • Member for 11 years
  • Last seen more than a month ago
177 votes
2 answers
26k views

Why do we not have spin greater than 2?

  • 2,703
138 votes
28 answers
27k views

How can you weigh your own head in an accurate way?

  • 2,885
115 votes
1 answer
7k views

Superfields and the Inconsistency of regularization by dimensional reduction

  • 3,433
112 votes
5 answers
33k views

What is the actual significance of the amplituhedron?

  • 1,892
100 votes
8 answers
22k views

Why is the $S_{z} =0$ state forbidden for photons?

  • 1,566
90 votes
1 answer
9k views

Classical and quantum anomalies

  • 6,360
88 votes
12 answers
14k views

What is spontaneous symmetry breaking in quantum systems?

86 votes
10 answers
9k views

Is there a symmetry associated to the conservation of information?

  • 16.9k
85 votes
3 answers
77k views

First and second order phase transitions

  • 32.5k
85 votes
8 answers
26k views

Why is information indestructible?

  • 2,833
85 votes
0 answers
3k views

Orbits of maximally entangled mixed states

80 votes
4 answers
26k views

Physical meaning of Legendre transformation

  • 1,067
67 votes
1 answer
3k views

On the Coulomb branch of ${\cal N}=2$ supersymmetric gauge theory

  • 3,552
65 votes
3 answers
7k views

Idea of Covering Group

  • 24.2k
65 votes
4 answers
6k views

From where (in space-time) does Hawking radiation originate?

  • 32.5k
60 votes
8 answers
9k views

What are the various physical mechanisms for energy transfer to the photon during blackbody emission?

58 votes
2 answers
6k views

Why do we expect our theories to be independent of cutoffs?

56 votes
4 answers
5k views

How exact is the analogy between statistical mechanics and quantum field theory?

  • 3,222
56 votes
5 answers
19k views

What does it mean for a Hamiltonian or system to be gapped or gapless?

  • 1,423
52 votes
6 answers
8k views

Haag's theorem and practical QFT computations

  • 2,633
51 votes
4 answers
5k views

Hilbert space of harmonic oscillator: Countable vs uncountable?

  • 14.2k
50 votes
4 answers
9k views

What if the LHC doesn't see SUSY?

  • 3,286
48 votes
3 answers
10k views

Does black hole formation contradict the Pauli exclusion principle?

  • 1,827
44 votes
7 answers
4k views

Why fermions have a first order (Dirac) equation and bosons a second order one?

43 votes
6 answers
10k views

How to write a paper in physics?

39 votes
2 answers
3k views

Periodic vs Open boundary conditions

  • 7,581
39 votes
1 answer
7k views

Operator-state correspondence in QFT

  • 1,007
39 votes
6 answers
3k views

Is there a theorem that says that QFT reduces to QM in a suitable limit? A theorem similar to Ehrenfest's theorem?

38 votes
1 answer
25k views

Phase shifts in scattering theory

  • 1,005
37 votes
4 answers
3k views

When can a global symmetry be gauged?

1
2 3 4 5
9