User SRS

31

65

votes

6

answers

8k

views

Why does a system try to minimize its total energy?

Nov 12 '18 at 8:43 Joce 3,231

73

61

votes

3

answers

6k

views

Idea of Covering Group

special-relativity group-theory lie-algebra representation-theory spin-statistics

Jul 1 '16 at 15:34 Valter Moretti 45.8k

9

24

votes

5

answers

5k

views

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

newtonian-mechanics classical-mechanics mathematical-physics differential-equations

Jun 26 '18 at 15:32 Acccumulation 5,735

12

23

votes

2

answers

2k

views

What is the conclusion from Aharonov-Bohm Effect?

quantum-mechanics electromagnetism gauge-theory topology aharonov-bohm

Aug 22 at 8:29 Qmechanic♦ 137k

22

23

votes

1

answer

5k

views

Self-adjoint and unbounded operators in QM

quantum-mechanics mathematical-physics operators hilbert-space

Mar 8 '14 at 18:40 Valter Moretti 45.8k

19

21

votes

2

answers

2k

views

Scattering, Perturbation and asymptotic states in LSZ reduction formula

quantum-field-theory hilbert-space scattering vacuum s-matrix-theory

Oct 23 '19 at 21:06 user1379857 4,782

17

21

votes

3

answers

5k

views

Symmetry Breaking And Phase transition

condensed-matter solid-state-physics phase-transition symmetry-breaking

Nov 2 '17 at 13:19 Wilson Ko 96

18

20

votes

2

answers

5k

views

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

nuclear-physics standard-model group-theory group-representations isospin-symmetry

Aug 14 '17 at 14:44 JeffDror 8,243

15

19

votes

2

answers

2k

views

Relation between Wilsonian renormalization and Counterterm Renormalization

quantum-field-theory field-theory renormalization effective-field-theory

Mar 21 '18 at 3:46 Spencer Tamagni 921

4

16

votes

2

answers

3k

views

Rest mass of phonon: is this concept definable?

quantum-field-theory special-relativity condensed-matter mass phonons

Nov 28 '16 at 5:08 Jan Fikacek 1

6

15

votes

7

answers

3k

views

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

solid-state-physics electrons electric-current semiconductor-physics metals

Jun 23 '18 at 13:23 Jason Arthur Taylor 341

7

15

votes

2

answers

3k

views

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

quantum-field-theory optics photons angular-momentum quantum-optics

Jan 21 '18 at 19:46 anna v 191k

5

14

votes

1

answer

3k

views

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

cosmology astrophysics cosmic-microwave-background baryogenesis leptogenesis

Dec 13 at 11:51 pela 9,686

14

votes

2

answers

811

views

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

particle-physics standard-model higgs large-hadron-collider particle-detectors

Jul 9 '17 at 21:30 SRS 20.9k

10

14

votes

1

answer

2k

views

Boosts are non-unitary!

quantum-field-theory special-relativity hilbert-space group-theory representation-theory

Dec 19 '16 at 18:28 SRS 20.9k

5

13

votes

6

answers

2k

views

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

electromagnetism special-relativity vectors inertial-frames lorentz-symmetry

Jul 2 '18 at 11:46 Frobenius 8,311

7

13

votes

4

answers

2k

views

temperature of electroweak phase transition

cosmology electroweak baryogenesis leptogenesis thermal-field-theory

May 30 '18 at 2:14 Gerry Schmitt 1

5

13

votes

4

answers

3k

views

What would qualify as a deceleration rather than an acceleration if speed is unchanged?

kinematics acceleration terminology velocity vectors

May 5 '18 at 12:15 Community♦ 1

9

13

votes

3

answers

961

views

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

statistical-mechanics condensed-matter phase-transition ising-model critical-phenomena

Feb 12 '18 at 9:41 AlQuemist 1,865

7

13

votes

2

answers

275

views

What is the physical implication(s) of the isomorphism between ${\rm SO}(2)$ and $\mathbb{R}/\mathbb{Z}$?

quantum-field-theory condensed-matter symmetry group-theory spacetime-dimensions

Jan 20 '18 at 13:32 Diracology 15.2k

7

13

votes

1

answer

747

views

Localized field quanta?

quantum-field-theory fourier-transform klein-gordon-equation point-particles

Jun 22 '17 at 10:24 SRS 20.9k

5

13

votes

1

answer

457

views

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

quantum-mechanics schroedinger-equation path-integral quantization

Jun 22 '17 at 1:42 user1504 13.7k

13

votes

1

answer

1k

views

QED and anomaly

quantum-field-theory quantum-electrodynamics unitarity quantum-anomalies ward-identity

Mar 2 '17 at 14:57 AccidentalFourierTransform 36.9k

21

13

votes

1

answer

11k

views

Majorana mass vs Dirac Mass

quantum-field-theory particle-physics mass dirac-equation majorana-fermions

Mar 1 '14 at 6:25 Luboš Motl 164k

3

12

votes

2

answers

296

views

Why don't we have a “Cooper pair” of two holes in a superconductor?

quantum-field-theory condensed-matter superconductivity many-body

Aug 26 at 12:04 sintetico 3,295

7

12

votes

3

answers

407

views

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

quantum-field-theory special-relativity causality

Oct 9 '17 at 19:10 AccidentalFourierTransform 36.9k

15

11

votes

3

answers

1k

views

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

quantum-field-theory lagrangian-formalism path-integral action 1pi-effective-action

Aug 6 at 19:09 Qmechanic♦ 137k

8

11

votes

3

answers

3k

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Do gamma matrices form a basis?

linear-algebra dirac-matrices clifford-algebra

Mar 27 at 14:08 fra_pero 557

5

11

votes

3

answers

6k

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Dirac spinor and Weyl spinor

special-relativity lorentz-symmetry dirac-equation group-representations spinors

Nov 21 '19 at 8:01 Qmechanic♦ 137k

2

11

votes

1

answer

310

views

Why there is no hole in Sommerfeld's model of free electrons?

condensed-matter solid-state-physics conductors electronic-band-theory metals

Feb 23 '17 at 1:13 Community♦ 1

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754 Questions

Why does a system try to minimize its total energy?

Idea of Covering Group

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

What is the conclusion from Aharonov-Bohm Effect?

Self-adjoint and unbounded operators in QM

Scattering, Perturbation and asymptotic states in LSZ reduction formula

Symmetry Breaking And Phase transition

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

Relation between Wilsonian renormalization and Counterterm Renormalization

Rest mass of phonon: is this concept definable?

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

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

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]

Boosts are non-unitary!

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

temperature of electroweak phase transition

What would qualify as a deceleration rather than an acceleration if speed is unchanged?

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

What is the physical implication(s) of the isomorphism between ${\rm SO}(2)$ and $\mathbb{R}/\mathbb{Z}$?

Localized field quanta?

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

QED and anomaly

Majorana mass vs Dirac Mass

Why don't we have a “Cooper pair” of two holes in a superconductor?

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

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

Do gamma matrices form a basis?

Dirac spinor and Weyl spinor

Why there is no hole in Sommerfeld's model of free electrons?