User Name YYY

31 votes

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Why there is no dipole gravitational wave?

answered Mar 1, 2016 at 17:08

16 votes

Is it possible to have a photon with -1 spin?

answered Jun 30, 2016 at 8:44

14 votes

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What are non-perturbative effects and how do we handle them?

answered Jan 30, 2016 at 16:06

12 votes

Mean field equations in the BCS theory of superconductivity

answered Jan 20, 2017 at 23:15

9 votes

How to calculate the charges of W and Z bosons?

answered Dec 1, 2016 at 15:05

9 votes

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Why is $\pi^0 \rightarrow \gamma \rightarrow e^-e^+$ forbidden but $\pi^+\rightarrow W^+ \rightarrow e^+ \nu_e$ allowed?

answered May 28, 2017 at 14:36

9 votes

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Restoration of spontaneously broken symmetry at high energy

answered Mar 5, 2016 at 15:03

8 votes

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Baryon number violation in the Standard Model

answered Feb 16, 2016 at 6:06

8 votes

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How do topological excitations of the pion field carry a baryon number?

answered Jan 19, 2017 at 20:03

7 votes

Theoretical Proof of Pauli's Exclusion Principle

answered Sep 30, 2017 at 23:18

7 votes

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How do we calculate the S-matrix using non-perturbative QFT?

answered Feb 16, 2016 at 6:21

7 votes

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What is "the scale at which a theory is defined"?

answered Mar 7, 2016 at 12:24

7 votes

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What is the matrix representation of the momentum operator (generator of translations) that is used in the commutators of the Poincaré Group?

answered Jun 30, 2016 at 18:33

6 votes

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Few basic questions about instantons

answered Jan 28, 2016 at 11:13

6 votes

How to arrive at the Dirac Equation from Poincaré Algebra?

answered Sep 9, 2017 at 15:20

6 votes

Motivation for the $\text{SU}_f(3)$ flavour symmetry of Gell-Mann and why did it work?

answered Jan 15, 2017 at 23:27

6 votes

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Why are both C and CP violation necessary for baryogenesis?

answered Jan 9, 2017 at 22:00

5 votes

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Mathematical description of Hubbard-Stratonovich transformation

answered Jan 9, 2017 at 13:01

5 votes

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Density of states and elliptic integral

answered Mar 17, 2016 at 18:45

5 votes

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Why is helicity important in quantum field theory?

answered Sep 14, 2017 at 10:13

5 votes

Interpretation of Dirac equation states for moving electron

answered Sep 16, 2017 at 23:04

5 votes

Is it the chiral anomaly which is solely responsible for having instanton effects (and therefore, the $\theta-$term) in the QCD action?

answered Oct 13, 2017 at 10:16

5 votes

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Chiral symmetry breaking and confusion with terminology

answered Feb 8, 2016 at 13:20

5 votes

Consequences of local and global anomaly

answered Jul 19, 2015 at 8:26

5 votes

Would the existence of more than 16 quark flavors make QCD deconfinning?

answered Feb 25, 2016 at 19:05

5 votes

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Why does $2\to 2$ scattering cross-section have $E_{CM}^2$ in denominator?

answered Oct 25, 2017 at 9:56

4 votes

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A question about the Dirac mass and Majorana mass

answered Feb 13, 2016 at 20:20

4 votes

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Why do we say that gluons carry color charge?

answered Feb 23, 2016 at 21:05

4 votes

Topological susceptibility

answered Dec 17, 2015 at 19:49

4 votes

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Can the effective vertex for $\gamma\to3\pi$ be derived directly from the anomaly?

answered Feb 13, 2016 at 18:28

Stack Exchange Network

156 Answers

Why there is no dipole gravitational wave?

Is it possible to have a photon with -1 spin?

What are non-perturbative effects and how do we handle them?

Mean field equations in the BCS theory of superconductivity

How to calculate the charges of W and Z bosons?

Why is $\pi^0 \rightarrow \gamma \rightarrow e^-e^+$ forbidden but $\pi^+\rightarrow W^+ \rightarrow e^+ \nu_e$ allowed?

Restoration of spontaneously broken symmetry at high energy

Baryon number violation in the Standard Model

How do topological excitations of the pion field carry a baryon number?

Theoretical Proof of Pauli's Exclusion Principle

How do we calculate the S-matrix using non-perturbative QFT?

What is "the scale at which a theory is defined"?

What is the matrix representation of the momentum operator (generator of translations) that is used in the commutators of the Poincaré Group?

Few basic questions about instantons

How to arrive at the Dirac Equation from Poincaré Algebra?

Motivation for the $\text{SU}_f(3)$ flavour symmetry of Gell-Mann and why did it work?

Why are both C and CP violation necessary for baryogenesis?

Mathematical description of Hubbard-Stratonovich transformation

Density of states and elliptic integral

Why is helicity important in quantum field theory?

Interpretation of Dirac equation states for moving electron

Is it the chiral anomaly which is solely responsible for having instanton effects (and therefore, the $\theta-$term) in the QCD action?

Chiral symmetry breaking and confusion with terminology

Consequences of local and global anomaly

Would the existence of more than 16 quark flavors make QCD deconfinning?

Why does $2\to 2$ scattering cross-section have $E_{CM}^2$ in denominator?

A question about the Dirac mass and Majorana mass

Why do we say that gluons carry color charge?

Topological susceptibility

Can the effective vertex for $\gamma\to3\pi$ be derived directly from the anomaly?