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user26143
  • Member for 10 years, 10 months
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46 votes
4 answers
4k views

Does quantum mechanics violate the equivalence principle?

28 votes
2 answers
15k views

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

24 votes
7 answers
16k views

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

21 votes
1 answer
1k views

LSZ reduction vs adiabatic hypothesis in perturbative calculation of interacting fields

17 votes
2 answers
3k views

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

17 votes
1 answer
3k views

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

14 votes
2 answers
1k views

Curved spacetime as a coherent state in string theory

13 votes
1 answer
3k views

Why Weyl invariance is important for consistent string theory?

12 votes
2 answers
2k views

Semantic problem about renormalizability

12 votes
1 answer
714 views

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

11 votes
2 answers
471 views

From representations to field theories

10 votes
6 answers
2k views

Schrödinger's cat and the difficulty of macroscopic superposition state

10 votes
1 answer
331 views

About the stability of the ground state of the bosonic string

9 votes
2 answers
2k views

Compute the central charge of $bc$ conformal field theory

9 votes
1 answer
996 views

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

8 votes
1 answer
517 views

Could dark matter be a kind of Goldstone boson?

8 votes
0 answers
401 views

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

8 votes
2 answers
2k views

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

8 votes
1 answer
374 views

A question about conformal transformation in Polchinski's string theory

8 votes
2 answers
3k views

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

7 votes
1 answer
232 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
864 views

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

7 votes
2 answers
204 views

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

6 votes
1 answer
968 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
583 views

Causality in QFT from vanishing commutator and the EPR paradox

6 votes
0 answers
419 views

A question about spontaneous symmetry breaking at macroscopic limit

6 votes
1 answer
255 views

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

6 votes
1 answer
969 views

A question about BRST current in bosonic string theory