User SRS

24

61

votes

6

answers

7k

views

Why does a system try to minimize its total energy?

Nov 12 at 8:43 Joce 2,991

59

54

votes

3

answers

4k

views

Idea of Covering Group

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

Jul 1 '16 at 15:34 Valter Moretti 38.6k

8

24

votes

5

answers

4k

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 4,211

8

20

votes

1

answer

2k

views

What is the conclusion from Aharonov-Bohm Effect?

quantum-mechanics electromagnetism quantum-field-theory gauge-theory topology

Dec 25 at 19:17 Michael Lucas Monterey 1

18

20

votes

1

answer

4k

views

Self-adjoint and unbounded operators in QM

quantum-mechanics mathematical-physics operators hilbert-space

Mar 8 '14 at 18:40 Valter Moretti 38.6k

14

18

votes

3

answers

4k

views

Symmetry Breaking And Phase transition

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

Nov 2 '17 at 13:19 Wilson Ko 71

15

18

votes

2

answers

4k

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 6,051

10

17

votes

2

answers

1k

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 741

3

16

votes

2

answers

2k

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

10

15

votes

2

answers

1k

views

Scattering, Perturbation and asymptotic states in LSZ reduction formula

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

May 8 '18 at 10:16 Arnold Neumaier 35.9k

4

14

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

14

votes

2

answers

779

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 6,690

8

13

votes

3

answers

763

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 1,685

12

13

votes

1

answer

930

views

QED and anomaly

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

Mar 2 '17 at 14:57 AccidentalFourierTransform 26.5k

9

13

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 6,690

5

12

votes

1

answer

2k

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

May 3 at 13:11 pela 8,926

4

12

votes

6

answers

1k

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 6,349

7

12

votes

2

answers

2k

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 167k

6

12

votes

2

answers

244

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 13.9k

6

12

votes

3

answers

343

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 26.5k

5

12

votes

1

answer

386

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 11.5k

7

11

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

4

11

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 Lorenzo Donati 357

6

11

votes

1

answer

600

views

Localized field quanta?

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

Jun 22 '17 at 10:24 SRS 6,690

7

11

votes

3

answers

2k

views

Do gamma matrices form a basis?

linear-algebra dirac-matrices clifford-algebra

Jun 2 '17 at 3:32 Qmechanic♦ 112k

2

11

votes

1

answer

196

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

10

11

votes

2

answers

1k

views

$(\frac{1}{2},\frac{1}{2})$ representation of $SU(2)\otimes SU(2)$

quantum-field-theory special-relativity group-theory group-representations lorentz-symmetry

Jan 16 '17 at 17:57 Community♦ 1

5

11

votes

6

answers

640

views

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

electromagnetism electromagnetic-radiation classical-electrodynamics equivalence-principle classical-field-theory

Dec 29 '16 at 16:42 Community♦ 1

4

11

votes

2

answers

506

views

Ambiguity in number of basis vectors [duplicate]

quantum-mechanics mathematical-physics operators hilbert-space

Jan 19 '15 at 12:06 SRS 6,690

16

11

votes

1

answer

9k

views

Majorana mass vs Dirac Mass

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

Mar 1 '14 at 6:25 Luboš Motl 156k

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701 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

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?

Scattering, Perturbation and asymptotic states in LSZ reduction formula

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

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

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

QED and anomaly

Boosts are non-unitary!

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

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

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

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?

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

temperature of electroweak phase transition

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

Localized field quanta?

Do gamma matrices form a basis?

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

$(\frac{1}{2},\frac{1}{2})$ representation of $SU(2)\otimes SU(2)$

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

Ambiguity in number of basis vectors [duplicate]

Majorana mass vs Dirac Mass