User user26143

43 votes

4 answers

3k views

Does quantum mechanics violate the equivalence principle?

quantum-mechanics equivalence-principle

asked Aug 1, 2013 at 13:50

24 votes

2 answers

12k views

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

asked Jun 22, 2013 at 17:18

21 votes

1 answer

930 views

LSZ reduction vs adiabatic hypothesis in perburbative calculation of interacting fields

quantum-field-theory perturbation-theory correlation-functions wick-rotation

asked Sep 25, 2014 at 8:08

20 votes

7 answers

12k views

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

quantum-mechanics probability determinism bells-inequality

asked May 2, 2014 at 21:08

16 votes

1 answer

2k views

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

quantum-mechanics quantum-field-theory condensed-matter second-quantization

asked Mar 10, 2014 at 13:15

15 votes

2 answers

2k views

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

quantum-field-theory commutator causality

asked May 11, 2014 at 11:49

13 votes

2 answers

885 views

Curved spacetime as a coherent state in string theory

string-theory operators hilbert-space

asked Sep 8, 2013 at 22:24

11 votes

2 answers

2k views

Semantic problem about renormalizability

quantum-field-theory renormalization

asked Dec 3, 2013 at 19:51

11 votes

2 answers

415 views

From representations to field theories

quantum-field-theory group-theory group-representations poincare-symmetry lorentz-symmetry

asked Mar 7, 2014 at 12:45

11 votes

1 answer

640 views

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

string-theory geodesics

asked Aug 6, 2013 at 19:16

11 votes

1 answer

2k views

Why Weyl invariance is important for consistent string theory?

string-theory conformal-field-theory scale-invariance

asked Aug 16, 2013 at 16:46

10 votes

6 answers

2k views

Schrödinger's cat and the difficulty of macroscopic superposition state

quantum-mechanics superposition decoherence density-operator schroedingers-cat

asked Mar 2, 2014 at 14:26

9 votes

1 answer

858 views

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

quantum-field-theory lagrangian-formalism standard-model renormalization effective-field-theory

asked Sep 16, 2013 at 18:09

9 votes

1 answer

256 views

About the stability of the ground state of the bosonic string

string-theory research-level

asked Jul 14, 2013 at 16:35

8 votes

1 answer

334 views

A question about conformal transformation in Polchinski's string theory

homework-and-exercises string-theory conformal-field-theory

asked Jul 17, 2013 at 2:08

8 votes

2 answers

1k views

Compute the central charge of $bc$ conformal field theory

homework-and-exercises string-theory operators conformal-field-theory wick-theorem

asked Jul 22, 2013 at 0:59

8 votes

1 answer

491 views

Could dark matter be a kind of Goldstone boson?

dark-matter symmetry-breaking

asked Nov 3, 2013 at 8:01

8 votes

0 answers

353 views

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

condensed-matter many-body fermi-liquids

asked Jul 12, 2014 at 10:40

7 votes

1 answer

224 views

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

homework-and-exercises string-theory

asked Jul 6, 2014 at 19:37

7 votes

2 answers

1k views

Time-dependent Schrodinger equation from variational principle

quantum-mechanics schroedinger-equation path-integral variational-principle density-functional-theory

asked May 29, 2014 at 6:14

7 votes

2 answers

2k views

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

homework-and-exercises string-theory differential-geometry curvature

asked Jul 10, 2013 at 13:01

7 votes

2 answers

2k views

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

quantum-mechanics momentum operators commutator dirac-delta-distributions

asked Jul 6, 2013 at 23:56

7 votes

2 answers

194 views

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

large-hadron-collider higgs

asked Jul 27, 2014 at 19:13

6 votes

1 answer

879 views

Is entangled state after measurement still an entangled state?

quantum-mechanics quantum-entanglement

asked Aug 9, 2014 at 6:41

6 votes

2 answers

915 views

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

quantum-mechanics quantum-field-theory operators wavefunction hilbert-space

asked Jul 23, 2014 at 12:37

6 votes

1 answer

1k views

Divergence theorem in complex coordinates

homework-and-exercises string-theory conformal-field-theory

asked Jul 15, 2013 at 16:15

6 votes

1 answer

879 views

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

homework-and-exercises string-theory

asked Jul 15, 2013 at 21:18

6 votes

2 answers

3k views

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

mathematical-physics operators hilbert-space

asked Jun 22, 2013 at 16:48

6 votes

1 answer

496 views

A question about Lorentz invariance of the Polyakov action

string-theory symmetry

asked Aug 1, 2013 at 22:39

6 votes

1 answer

741 views

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

quantum-mechanics determinism cellular-automaton

asked Jun 12, 2014 at 7:19

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89 Questions

Does quantum mechanics violate the equivalence principle?

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

LSZ reduction vs adiabatic hypothesis in perburbative calculation of interacting fields

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

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

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

Curved spacetime as a coherent state in string theory

Semantic problem about renormalizability

From representations to field theories

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

Why Weyl invariance is important for consistent string theory?

Schrödinger's cat and the difficulty of macroscopic superposition state

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

About the stability of the ground state of the bosonic string

A question about conformal transformation in Polchinski's string theory

Compute the central charge of $bc$ conformal field theory

Could dark matter be a kind of Goldstone boson?

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

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

Time-dependent Schrodinger equation from variational principle

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

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

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

Is entangled state after measurement still an entangled state?

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

Divergence theorem in complex coordinates

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

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

A question about Lorentz invariance of the Polyakov action

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