User SRS

31

65

votes

6

answers

9k

views

Why does a system try to minimize its total energy?

Nov 12 '18 at 8:43 Joce 3,261

79

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 51k

21

24

votes

2

answers

2k

views

Scattering, Perturbation and asymptotic states in LSZ reduction formula

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

Dec 25 at 14:25 Frederic Thomas 4,464

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 6,393

23

24

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 51k

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♦ 146k

17

22

votes

2

answers

2k

views

Relation between Wilsonian renormalization and Counterterm Renormalization

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

Mar 24 at 21:42 Abdelmalek Abdesselam 4,879

19

22

votes

3

answers

6k

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

6k

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 8,334

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

7

15

votes

7

answers

4k

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 371

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 202k

15

votes

2

answers

833

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 22k

14

votes

1

answer

1k

views

QED and anomaly

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

Apr 9 at 14:32 Mauro Giliberti 2,305

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 '19 at 11:51 pela 9,788

9

14

votes

3

answers

1k

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 1,911

12

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 22k

8

13

votes

3

answers

11k

views

Constructing Lagrangian from the Hamiltonian

classical-mechanics lagrangian-formalism mathematical-physics hamiltonian-formalism hamiltonian

Dec 2 at 5:58 Ciano K 1

5

13

votes

6

answers

3k

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 9,524

9

13

votes

4

answers

3k

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

7

13

votes

2

answers

295

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 15.6k

7

13

votes

3

answers

443

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 41k

7

13

votes

1

answer

830

views

Localized field quanta?

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

Jun 22 '17 at 10:24 SRS 22k

5

13

votes

1

answer

503

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 14.5k

21

13

votes

1

answer

12k

views

Majorana mass vs Dirac Mass

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

Mar 1 '14 at 6:25 Luboš Motl 167k

3

12

votes

2

answers

390

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 3,340

16

12

votes

3

answers

2k

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♦ 146k

5

12

votes

3

answers

7k

views

Dirac spinor and Weyl spinor

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

Nov 21 '19 at 8:01 Qmechanic♦ 146k

8

11

votes

3

answers

3k

views

Do gamma matrices form a basis?

linear-algebra dirac-matrices clifford-algebra

Mar 27 '20 at 14:08 fra_pero 569

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769 Questions

Why does a system try to minimize its total energy?

Idea of Covering Group

Scattering, Perturbation and asymptotic states in LSZ reduction formula

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?

Relation between Wilsonian renormalization and Counterterm Renormalization

Symmetry Breaking And Phase transition

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

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?

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

QED and anomaly

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

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

Boosts are non-unitary!

Constructing Lagrangian from the Hamiltonian

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?

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

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

Localized field quanta?

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

Majorana mass vs Dirac Mass

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

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

Dirac spinor and Weyl spinor

Do gamma matrices form a basis?