User SRS

24

61

votes

6

answers

8k

views

Why does a system try to minimize its total energy?

Nov 12 '18 at 8:43 Joce 3,021

59

54

votes

3

answers

5k

views

Idea of Covering Group

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

Jul 1 '16 at 15:34 Valter Moretti 39.2k

9

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 4,522

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 39.2k

10

18

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

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

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 6,051

11

16

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 36.1k

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

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

785

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 6,750

9

13

votes

3

answers

777

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

948

views

QED and anomaly

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

Mar 2 '17 at 14:57 AccidentalFourierTransform 27.2k

10

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 6,750

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 9,019

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 6,509

5

12

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

7

12

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 169k

6

12

votes

2

answers

249

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 14k

7

12

votes

3

answers

355

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 27.2k

5

12

votes

1

answer

390

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

6

11

votes

1

answer

619

views

Localized field quanta?

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

Jun 22 '17 at 10:24 SRS 6,750

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♦ 115k

2

11

votes

1

answer

202

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

660

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

513

views

Ambiguity in number of basis vectors [duplicate]

quantum-mechanics mathematical-physics operators hilbert-space

Jan 19 '15 at 12:06 SRS 6,750

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 157k

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710 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

Relation between Wilsonian renormalization and Counterterm Renormalization

Symmetry Breaking And Phase transition

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

Scattering, Perturbation and asymptotic states in LSZ reduction formula

Rest mass of phonon: is this concept definable?

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

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

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