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user26143
  • Member for 9 years, 9 months
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45 votes
4 answers
3k views

Does quantum mechanics violate the equivalence principle?

24 votes
2 answers
13k views

Differences between symmetric, Hermitian, self-adjoint, and essentially self-adjoint operators

22 votes
7 answers
14k views

Why was quantum mechanics regarded as a non-deterministic theory?

21 votes
1 answer
1k views

LSZ reduction vs adiabatic hypothesis in perburbative calculation of interacting fields

17 votes
1 answer
2k views

Is non-relativistic quantum field theory equivalent with quantum mechanics?

16 votes
2 answers
2k views

A question about causality and Quantum Field Theory from improper Lorentz transformation

14 votes
2 answers
947 views

Curved spacetime as a coherent state in string theory

12 votes
1 answer
3k views

Why Weyl invariance is important for consistent string theory?

12 votes
1 answer
684 views

A question about the higher-order Weyl variation for the geodesic distance

11 votes
2 answers
2k views

Semantic problem about renormalizability

11 votes
2 answers
449 views

From representations to field theories

10 votes
6 answers
2k views

Schrödinger's cat and the difficulty of macroscopic superposition state

9 votes
1 answer
902 views

How to understand the Lagrangian of the standard model, effective or "fundamental"?

9 votes
1 answer
289 views

About the stability of the ground state of the bosonic string

8 votes
2 answers
2k views

What is the most general expression for the coordinate representation of momentum operator?

8 votes
1 answer
345 views

A question about conformal transformation in Polchinski's string theory

8 votes
2 answers
2k views

Deriving the transformation under Weyl rescaling in Polchinski eq. (1.2.31)

8 votes
2 answers
1k views

Compute the central charge of $bc$ conformal field theory

8 votes
1 answer
496 views

Could dark matter be a kind of Goldstone boson?

8 votes
0 answers
367 views

Is that possible to derive Landau-Fermi liquid theory from microscopic equation?

7 votes
1 answer
231 views

Where do $X_0^{-d}$ and $G'_r$ come from in Polchinski Eq. (6.2.13)?

7 votes
2 answers
1k views

Time-dependent Schrodinger equation from variational principle

7 votes
1 answer
787 views

What is the motivation for introducing "ontological state" in 't Hooft's deterministic quantum mechanics

7 votes
2 answers
201 views

Has the possibility of Higgs boson being a composite particle excluded already?

6 votes
1 answer
922 views

Is entangled state after measurement still an entangled state?

6 votes
2 answers
1k views

What is the analogy of $|x\rangle$ in quantum field theory?

6 votes
1 answer
551 views

Causality in QFT from vanishing commutator and the EPR paradox

6 votes
0 answers
405 views

A question about spontaneous symmetry breaking at macroscopic limit

6 votes
1 answer
227 views

A question about the coupling between string and gauge field $A_{\mu}$

6 votes
1 answer
912 views

A question about BRST current in bosonic string theory