User SRS

24

60

votes

6

answers

7k

views

Why does a system try to minimize its total energy?

Nov 12 at 8:43 Joce 2,971

53

49

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 37.1k

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 at 15:32 Acccumulation 2,696

7

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

17

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 37.1k

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 5,951

14

17

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

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

4

15

votes

7

answers

2k

views

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

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

Jun 23 at 13:23 Jason Arthur Taylor 311

9

14

votes

2

answers

911

views

Scattering, Perturbation and asymptotic states in LSZ reduction formula

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

May 8 at 10:16 Arnold Neumaier 35.1k

14

votes

2

answers

761

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 6,543

10

13

votes

2

answers

924

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 636

8

13

votes

3

answers

701

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 1,635

4

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

Dec 12 at 0:37 pela 7,959

4

12

votes

6

answers

707

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 at 11:46 Frobenius 5,395

4

12

votes

4

answers

2k

views

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

kinematics acceleration terminology velocity vectors

May 5 at 12:15 Lorenzo Donati 352

6

12

votes

2

answers

237

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 13.7k

5

12

votes

3

answers

325

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 25.5k

11

12

votes

1

answer

863

views

QED and anomaly

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

Mar 2 '17 at 14:57 AccidentalFourierTransform 25.5k

10

12

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 6,543

7

11

votes

4

answers

2k

views

temperature of electroweak phase transition

cosmology electroweak baryogenesis leptogenesis thermal-field-theory

May 30 at 2:14 Gerry Schmitt 1

6

11

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 160k

5

11

votes

1

answer

530

views

Localized field quanta?

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

Jun 22 '17 at 10:24 SRS 6,543

2

11

votes

1

answer

183

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

974

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

4

10

votes

1

answer

739

views

What is the physical significance of the double connectivity of $\rm SO(3)$ group manifold?

quantum-mechanics mathematical-physics group-theory group-representations spin-statistics

Jul 18 '17 at 18:44 SRS 6,543

5

10

votes

1

answer

337

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 11.2k

6

10

votes

3

answers

2k

views

Do gamma matrices form a basis?

linear-algebra dirac-matrices clifford-algebra

Jun 2 '17 at 3:32 Qmechanic♦ 106k

5

10

votes

6

answers

546

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

3

10

votes

2

answers

481

views

Ambiguity in number of basis vectors [duplicate]

quantum-mechanics mathematical-physics operators hilbert-space

Jan 19 '15 at 12:06 SRS 6,543

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677 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

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

Symmetry Breaking And Phase transition

Rest mass of phonon: is this concept definable?

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

Scattering, Perturbation and asymptotic states in LSZ reduction formula

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

Relation between Wilsonian renormalization and Counterterm Renormalization

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

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 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?

QED and anomaly

Boosts are non-unitary!

temperature of electroweak phase transition

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

Localized field quanta?

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

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

What is the physical significance of the double connectivity of $\rm SO(3)$ group manifold?

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

Do gamma matrices form a basis?

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

Ambiguity in number of basis vectors [duplicate]