User Wein Eld

19 votes

2 answers

2k views

How to understand "analytical continuation" in the context of instantons?

asked Apr 4, 2017 at 16:18

14 votes

2 answers

801 views

When can we handle a quantum field like a classical field?

asked Feb 10, 2018 at 9:13

14 votes

0 answers

447 views

How to perform a derivative of a functional determinant?

asked Mar 4, 2021 at 12:09

10 votes

2 answers

1k views

Why is $p_y$ conserved in the Landau gauge when we know the electron moves in circles?

asked Sep 22, 2016 at 8:51

9 votes

3 answers

852 views

Is the free Bose field a conformal field?

asked Sep 5, 2016 at 7:58

9 votes

1 answer

754 views

How to verify this statement in optical theorem?

asked Mar 28, 2017 at 14:39

9 votes

1 answer

893 views

Is there any physical meaning for such a correlation function?

asked Mar 8, 2018 at 9:24

8 votes

2 answers

824 views

Does the Coleman-Weinberg mechanism belong to the dynamical symmetry breaking or the anomaly?

asked Sep 5, 2016 at 8:30

8 votes

1 answer

490 views

Why do we think that the $U(1)$ problem is solved by instantons?

asked Dec 20, 2019 at 14:14

7 votes

1 answer

2k views

How can I understand the tunneling problem by Euclidean path integral where the quadratic fluctuation has a negative eigenvalue?

asked Nov 17, 2015 at 20:13

7 votes

1 answer

1k views

Do the position-momentum uncertainty and time-energy uncertainty really exist in QFT?

asked Dec 9, 2015 at 18:09

7 votes

3 answers

3k views

Does the entanglement depend on the basis?

asked Jul 10, 2016 at 8:25

6 votes

2 answers

2k views

The relation between critical surface and the (renormalization) fixed point

asked Jul 18, 2016 at 6:52

6 votes

1 answer

2k views

What's the difference between the diffeomorphism invariance and reparametrization invariance?

asked Apr 5, 2016 at 20:11

6 votes

1 answer

311 views

Would quantum fluctuations cause problems for scalar-field inflation?

asked Dec 6, 2015 at 23:32

6 votes

2 answers

986 views

How to interpret the field configuration in quantum field theory?

asked Dec 7, 2015 at 12:51

6 votes

1 answer

2k views

What is the physical meaning of a primary field?

asked Aug 7, 2016 at 21:29

6 votes

1 answer

344 views

Which inverse of $-(\partial^2 + m^2)$ should be used in the path integral?

asked Jul 7, 2016 at 8:33

6 votes

1 answer

791 views

A question on large-N limit?

asked Jun 3, 2017 at 17:02

6 votes

1 answer

936 views

How is scale invariance broken in QCD?

asked Dec 12, 2017 at 12:09

5 votes

1 answer

258 views

A question from cosmological perturbation theory

asked Apr 22, 2018 at 22:04

5 votes

1 answer

402 views

Does the ABJ anomaly for the Abelian gauge field have a topological argument?

asked Jun 4, 2018 at 15:10

5 votes

3 answers

521 views

Quantum symmetries which are not described by groups

asked Aug 11, 2016 at 12:46

5 votes

1 answer

292 views

A question about the two-dimensional Ising model

asked Sep 16, 2016 at 14:50

5 votes

1 answer

710 views

On the Euclidean action for QCD

asked Dec 23, 2019 at 10:52

5 votes

1 answer

672 views

How to define energy density and pressure for a scalar condensate?

asked Mar 8, 2021 at 20:14

4 votes

1 answer

195 views

Why do not we consider the topological term in Abelian gauge theory?

asked Apr 3, 2020 at 10:26

4 votes

2 answers

450 views

Can Higgs potential provide a cosmological constant?

asked Apr 21, 2020 at 8:53

4 votes

0 answers

203 views

A question from Coleman's "aspects of symmetries''

asked Oct 25, 2016 at 11:14

4 votes

1 answer

1k views

Hamiltionian spectrum in unstable systems

asked Dec 15, 2016 at 19:15

Stack Exchange Network

92 Questions

How to understand "analytical continuation" in the context of instantons?

When can we handle a quantum field like a classical field?

How to perform a derivative of a functional determinant?

Why is $p_y$ conserved in the Landau gauge when we know the electron moves in circles?

Is the free Bose field a conformal field?

How to verify this statement in optical theorem?

Is there any physical meaning for such a correlation function?

Does the Coleman-Weinberg mechanism belong to the dynamical symmetry breaking or the anomaly?

Why do we think that the $U(1)$ problem is solved by instantons?

How can I understand the tunneling problem by Euclidean path integral where the quadratic fluctuation has a negative eigenvalue?

Do the position-momentum uncertainty and time-energy uncertainty really exist in QFT?

Does the entanglement depend on the basis?

The relation between critical surface and the (renormalization) fixed point

What's the difference between the diffeomorphism invariance and reparametrization invariance?

Would quantum fluctuations cause problems for scalar-field inflation?

How to interpret the field configuration in quantum field theory?

What is the physical meaning of a primary field?

Which inverse of $-(\partial^2 + m^2)$ should be used in the path integral?

A question on large-N limit?

How is scale invariance broken in QCD?

A question from cosmological perturbation theory

Does the ABJ anomaly for the Abelian gauge field have a topological argument?

Quantum symmetries which are not described by groups

A question about the two-dimensional Ising model

On the Euclidean action for QCD

How to define energy density and pressure for a scalar condensate?

Why do not we consider the topological term in Abelian gauge theory?

Can Higgs potential provide a cosmological constant?

A question from Coleman's "aspects of symmetries''

Hamiltionian spectrum in unstable systems