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user26143
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43 votes
4 answers
3k views

Does quantum mechanics violate the equivalence principle?

24 votes
2 answers
12k views

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

21 votes
1 answer
930 views

LSZ reduction vs adiabatic hypothesis in perburbative calculation of interacting fields

20 votes
7 answers
12k views

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

16 votes
1 answer
2k views

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

15 votes
2 answers
2k views

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

13 votes
2 answers
885 views

Curved spacetime as a coherent state in string theory

11 votes
2 answers
2k views

Semantic problem about renormalizability

11 votes
2 answers
415 views

From representations to field theories

11 votes
1 answer
640 views

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

11 votes
1 answer
2k views

Why Weyl invariance is important for consistent string theory?

10 votes
6 answers
2k views

Schrödinger's cat and the difficulty of macroscopic superposition state

9 votes
1 answer
858 views

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

9 votes
1 answer
256 views

About the stability of the ground state of the bosonic string

8 votes
1 answer
334 views

A question about conformal transformation in Polchinski's string theory

8 votes
2 answers
1k views

Compute the central charge of $bc$ conformal field theory

8 votes
1 answer
491 views

Could dark matter be a kind of Goldstone boson?

8 votes
0 answers
353 views

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

7 votes
1 answer
224 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
2 answers
2k views

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

7 votes
2 answers
2k views

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

7 votes
2 answers
194 views

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

6 votes
1 answer
879 views

Is entangled state after measurement still an entangled state?

6 votes
2 answers
915 views

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

6 votes
1 answer
1k views

Divergence theorem in complex coordinates

6 votes
1 answer
879 views

How to derive Eq. (2.1.24) in Polchinski's string theory book

6 votes
2 answers
3k views

Proof for the completeness of eigenfunctions of a self-adjoint operator

6 votes
1 answer
496 views

A question about Lorentz invariance of the Polyakov action

6 votes
1 answer
741 views

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