User SRS

73 votes

3 answers

10k views

Idea of Covering Group

asked Jan 31, 2014 at 1:31

72 votes

5 answers

12k views

Why does a system try to minimize its total energy?

asked May 11, 2016 at 20:27

39 votes

4 answers

5k views

Scattering, Perturbation and asymptotic states in LSZ reduction formula

asked Oct 1, 2015 at 13:30

30 votes

3 answers

4k views

In what sense is the proper/effective action $\Gamma[\phi_c]$ a quantum-corrected classical action $S[\phi]$?

asked Jun 7, 2017 at 7:34

27 votes

2 answers

4k views

Relation between Wilsonian renormalization and Counterterm Renormalization

asked Feb 17, 2017 at 15:41

27 votes

3 answers

32k views

Constructing Lagrangian from the Hamiltonian

asked Jun 20, 2015 at 17:26

27 votes

4 answers

9k views

Symmetry Breaking And Phase transition

asked Mar 26, 2014 at 10:20

27 votes

5 answers

5k views

Newton's law requires two initial conditions while the Taylor series requires infinite!

asked Jun 25, 2018 at 12:48

26 votes

1 answer

7k views

Self-adjoint and unbounded operators in QM

asked Mar 7, 2014 at 18:19

24 votes

2 answers

3k views

What is the conclusion from Aharonov-Bohm Effect?

asked Feb 17, 2014 at 11:32

22 votes

2 answers

9k views

What does a $\rm SU(2)$ isospin doublet really mean?

asked Feb 2, 2014 at 3:05

19 votes

1 answer

6k views

Does the number density of photons $n_\gamma\approx 10^8 \:\mathrm m^{-3}$ refer to CMB photons only?

asked Jul 28, 2015 at 8:37

19 votes

2 answers

1k views

Why is Higgs particle detected much later than top quark when it's lighter? [duplicate]

asked Jul 9, 2017 at 13:20

18 votes

2 answers

4k views

Rest mass of phonon: is this concept definable?

asked May 19, 2016 at 17:25

17 votes

4 answers

1k views

Why do we take two different approaches to the "meaning of causality" in quantum mechanics and quantum field theory?

asked Sep 24, 2017 at 15:31

16 votes

3 answers

2k views

Are the first order phase transitions always associated with a latent heat?

asked Jul 27, 2017 at 19:00

16 votes

7 answers

6k views

Why the electrons below the Fermi level do not conduct electricity?

asked Jan 28, 2017 at 15:08

16 votes

1 answer

2k views

QED and anomaly

asked Jul 19, 2015 at 14:59

16 votes

2 answers

4k views

Boosts are non-unitary!

asked Feb 13, 2014 at 15:09

16 votes

1 answer

2k views

Localized field quanta?

asked Feb 11, 2014 at 12:32

16 votes

2 answers

5k views

What is the orbital angular momentum (OAM) of individual photons?

asked Feb 13, 2014 at 9:24

15 votes

2 answers

3k views

Uncertainty principle in quantum field theory

asked Jun 24, 2015 at 8:33

15 votes

2 answers

4k views

Does classical electrodynamics have $U(1)$ symmetry? If yes, how?

asked Aug 19, 2017 at 7:48

14 votes

1 answer

757 views

What are the minimal postulates to do quantum mechanics in path-integral formulation without knowing the operator formulation?

asked Jun 5, 2017 at 3:36

14 votes

6 answers

6k views

How do we prove that the 4-current $j^\mu$ transforms like $x^\mu$ under Lorentz transformation?

asked Mar 19, 2018 at 15:14

14 votes

4 answers

3k views

Temperature of electroweak phase transition

asked Dec 17, 2014 at 7:34

14 votes

3 answers

11k views

Dirac spinor and Weyl spinor

asked Jan 27, 2014 at 4:58

14 votes

1 answer

18k views

Majorana mass vs Dirac Mass

asked Mar 1, 2014 at 5:31

14 votes

2 answers

4k views

What is wrong with a nonrenormalizable theory?

asked Nov 28, 2016 at 12:41

13 votes

6 answers

1k views

Charged particle as observed from an inertial and a non-inertial frame of reference

asked Oct 15, 2016 at 3:56

Stack Exchange Network

782 Questions

Idea of Covering Group

Why does a system try to minimize its total energy?

Scattering, Perturbation and asymptotic states in LSZ reduction formula

In what sense is the proper/effective action $\Gamma[\phi_c]$ a quantum-corrected classical action $S[\phi]$?

Relation between Wilsonian renormalization and Counterterm Renormalization

Constructing Lagrangian from the Hamiltonian

Symmetry Breaking And Phase transition

Newton's law requires two initial conditions while the Taylor series requires infinite!

Self-adjoint and unbounded operators in QM

What is the conclusion from Aharonov-Bohm Effect?

What does a $\rm SU(2)$ isospin doublet really mean?

Does the number density of photons $n_\gamma\approx 10^8 \:\mathrm m^{-3}$ refer to CMB photons only?

Why is Higgs particle detected much later than top quark when it's lighter? [duplicate]

Rest mass of phonon: is this concept definable?

Why do we take two different approaches to the "meaning of causality" in quantum mechanics and quantum field theory?

Are the first order phase transitions always associated with a latent heat?

Why the electrons below the Fermi level do not conduct electricity?

QED and anomaly

Boosts are non-unitary!

Localized field quanta?

What is the orbital angular momentum (OAM) of individual photons?

Uncertainty principle in quantum field theory

Does classical electrodynamics have $U(1)$ symmetry? If yes, how?

What are the minimal postulates to do quantum mechanics in path-integral formulation without knowing the operator formulation?

How do we prove that the 4-current $j^\mu$ transforms like $x^\mu$ under Lorentz transformation?

Temperature of electroweak phase transition

Dirac spinor and Weyl spinor

Majorana mass vs Dirac Mass

What is wrong with a nonrenormalizable theory?

Charged particle as observed from an inertial and a non-inertial frame of reference