User rainman

31 votes

3 answers

12k views

How to derive the formula for the quantum Hamiltonian $\hat H(\hat P,\hat Q)$ in terms of the classical $H(q,p)$, via Weyl Ordering?

asked Mar 19, 2013 at 8:30

27 votes

1 answer

17k views

Lorentz Invariant Integration Measure [closed]

asked Nov 3, 2013 at 13:09

20 votes

4 answers

11k views

How to derive source-free Maxwell's equations from the electromagnetic Lagrangian?

asked Jul 19, 2013 at 18:39

10 votes

1 answer

5k views

Generators of Poincare Groups

asked Feb 10, 2014 at 18:17

8 votes

2 answers

2k views

Number of the Generators of Poincare Group

asked Feb 22, 2014 at 8:11

8 votes

5 answers

3k views

$m$ in Klein-Gordon Equation

asked Jan 18, 2019 at 8:51

8 votes

4 answers

2k views

Hamiltonian Field Theory in Peskin & Schroeder

asked Sep 21, 2021 at 16:50

7 votes

2 answers

1k views

Rotation Group and Lorentz Group

asked Feb 17, 2014 at 18:42

7 votes

2 answers

2k views

Parallel Transport of a 4-vector

asked Sep 27, 2013 at 21:54

6 votes

1 answer

1k views

Reason behind canonical quantization in QFT?

asked Jul 8, 2013 at 18:36

6 votes

1 answer

2k views

$(1/2, 0)$ representation of the Lorentz Group $SO(1,3)$

asked Jul 21, 2016 at 16:03

5 votes

1 answer

2k views

Definition of Local Function

asked Feb 22, 2013 at 19:35

5 votes

3 answers

4k views

Square bracket notation for anti-symmetric part of a tensor

asked Sep 30, 2013 at 20:13

5 votes

1 answer

926 views

Quantization surface in QFT

asked Sep 17, 2013 at 22:26

5 votes

3 answers

789 views

Poincare Generators in terms of Position and Momentum

asked Jul 15, 2014 at 18:36

4 votes

1 answer

272 views

Vacuum Structure of Schwinger Model

asked Feb 13, 2015 at 19:22

4 votes

2 answers

7k views

Light-cone coordinates

asked Sep 17, 2013 at 8:47

4 votes

3 answers

205 views

Reason for considering the positive root

asked Feb 24, 2013 at 17:10

4 votes

2 answers

2k views

Definition of Free field or Noninteracting field

asked Feb 26, 2013 at 9:24

4 votes

2 answers

2k views

Unitary spacetime translation operator

asked Jun 29, 2013 at 18:41

4 votes

1 answer

1k views

Most general Feynman diagram

asked Jun 10, 2013 at 15:43

4 votes

1 answer

419 views

Relation between symmetry factors

asked Jun 13, 2013 at 18:37

4 votes

1 answer

475 views

Confusion with Newton's Second Law : Position & Time Dependence of Force

asked Oct 2, 2014 at 11:08

4 votes

1 answer

575 views

Pole of a free-particle propagator

asked Aug 25, 2017 at 3:55

4 votes

1 answer

626 views

Generating Functional for Scalar Fields

asked Jul 29, 2017 at 19:09

4 votes

0 answers

770 views

Normalization of One-Particle States for Klein-Gordon Field Quantization

asked Nov 8, 2021 at 4:06

3 votes

2 answers

226 views

Unit of pion-decay constant

asked Jan 29, 2019 at 8:54

3 votes

1 answer

3k views

Parity and the Dipole Operator for a Two-Level System

asked May 12, 2020 at 2:21

3 votes

1 answer

4k views

Formula for Symmetry Factor

asked Jun 15, 2013 at 10:45

3 votes

0 answers

738 views

Vacuum to vacuum transition amplitude [duplicate]

asked Apr 2, 2013 at 15:28

Stack Exchange Network

77 Questions

How to derive the formula for the quantum Hamiltonian $\hat H(\hat P,\hat Q)$ in terms of the classical $H(q,p)$, via Weyl Ordering?

Lorentz Invariant Integration Measure [closed]

How to derive source-free Maxwell's equations from the electromagnetic Lagrangian?

Generators of Poincare Groups

Number of the Generators of Poincare Group

$m$ in Klein-Gordon Equation

Hamiltonian Field Theory in Peskin & Schroeder

Rotation Group and Lorentz Group

Parallel Transport of a 4-vector

Reason behind canonical quantization in QFT?

$(1/2, 0)$ representation of the Lorentz Group $SO(1,3)$

Definition of Local Function

Square bracket notation for anti-symmetric part of a tensor

Quantization surface in QFT

Poincare Generators in terms of Position and Momentum

Vacuum Structure of Schwinger Model

Light-cone coordinates

Reason for considering the positive root

Definition of Free field or Noninteracting field

Unitary spacetime translation operator

Most general Feynman diagram

Relation between symmetry factors

Confusion with Newton's Second Law : Position & Time Dependence of Force

Pole of a free-particle propagator

Generating Functional for Scalar Fields

Normalization of One-Particle States for Klein-Gordon Field Quantization

Unit of pion-decay constant

Parity and the Dipole Operator for a Two-Level System

Formula for Symmetry Factor

Vacuum to vacuum transition amplitude [duplicate]