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184 votes
7 answers
224k views

How do moving charges produce magnetic fields?

  • 6,685
117 votes
4 answers
12k views

The Role of Rigor [closed]

  • 1,943
109 votes
3 answers
19k views

Why are some people are claiming that the Big Bang never happened?

  • 1,378
79 votes
4 answers
26k views

Is the Planck length the smallest length that exists in the universe or is it the smallest length that can be observed?

61 votes
5 answers
6k views

What exactly is regularization in QFT?

  • 54.5k
54 votes
4 answers
4k views

Is there an underlying physical reason why the Coriolis force is similar to the magnetic component of the Lorentz force?

  • 2,253
31 votes
1 answer
3k views

Sympletic structure of General Relativity

  • 8,369
29 votes
3 answers
2k views

Why does non-commutativity in quantum mechanics require us to use Hilbert spaces?

24 votes
5 answers
2k views

Dependence of spin on classical vs non-classical physics?

21 votes
2 answers
5k views

Can any rank tensor be decomposed into symmetric and anti-symmetric parts?

  • 1,056
18 votes
1 answer
1k views

How do symmetries “define” physical laws?

17 votes
5 answers
670 views

Can I swap quantum mechanical ground state for some classical trajectory distribution and have it sit still after the swap?

14 votes
2 answers
30k views

Fundamental equation(s) of string theory?

  • 185
14 votes
4 answers
22k views

How to construct the radial component of the momentum operator?

  • 4,532
12 votes
2 answers
1k views

Is Liouville's equation an axiom of classical statistical mechanics?

  • 3,016
9 votes
2 answers
931 views

Subgroup of Lorentz Group Generated by Boosts

  • 91
9 votes
3 answers
406 views

How to do quantum mechanics if the Schrödinger equation was a Sturm-Liouville equation?

  • 10.9k
9 votes
5 answers
1k views

Microcanonical ensemble, ergodicity and symmetry breaking

  • 1,664
8 votes
1 answer
3k views

Maxwell's equation in curved spacetime - how come? And experimental evidence?

7 votes
3 answers
6k views

Noether's theorem in general relativity

7 votes
2 answers
910 views

Why isn't the anticommutativity of spinors sufficient as "spin-statistics-theorem"?

  • 9,221
6 votes
2 answers
131 views

Possible mechanics based on the known symmetries in the nature (investigating rumor)

  • 7,839
5 votes
1 answer
456 views

Legendre transform for non-local Lagrangians, or Hamiltonian of non-local Lagrangian and their properties

  • 371
5 votes
1 answer
366 views

Representations of Lie group symmetries on Hilbert space

  • 141
4 votes
1 answer
2k views

What is the partial differential equation expansion of the Einstein Field Equations?

  • 163
3 votes
1 answer
211 views

Is the continuity equation valid for a diffusion current?

  • 9,221
2 votes
1 answer
205 views

A question on the functional dependence of the Lagrangian density

  • 2,773
2 votes
1 answer
175 views

How do you know when you need to use distributions to represent charge densities? [closed]

0 votes
4 answers
852 views

Does big bang have really any justification while we are living within a huge chaos?

  • 241