User Wild Feather

4 votes

3 answers

630 views

Is the parity operator an observable?

asked Jun 12, 2020 at 8:23

4 votes

3 answers

98 views

Why do free-falling particles converge onto the Hubble flow?

asked Jan 8 at 13:39

2 votes

1 answer

95 views

Why is cosmological time unique?

asked Jan 12 at 10:12

2 votes

1 answer

84 views

Concept of distance in cosmology

asked Jan 13 at 14:23

2 votes

2 answers

3k views

Expected value of linear momentum with real wave function

asked Feb 1, 2021 at 9:40

1 vote

1 answer

81 views

Dimensionless power spectrum

asked Oct 6, 2022 at 19:10

1 vote

2 answers

2k views

Variation of resistance with temperature in semiconductors

asked Oct 18, 2017 at 16:46

1 vote

1 answer

52 views

Different definitions of recession velocity

asked Jan 19 at 9:50

1 vote

2 answers

123 views

Continuity equation for the conservation of energy from the conservation of the energy-momentum tensor

asked Jan 27 at 10:24

1 vote

2 answers

133 views

Upper index covariant derivative $\nabla^\mu$

asked Feb 2 at 18:39

1 vote

1 answer

164 views

Compute density of states in momentum space and in phase space

asked Feb 11 at 19:54

1 vote

0 answers

51 views

Contraction of distances in explanation of relativity of simultaneity in special relativity

asked Mar 9 at 10:09

1 vote

1 answer

54 views

How to express symmetry of a mixed (1,1) tensor with upper and lower index?

asked Mar 15 at 10:24

1 vote

0 answers

32 views

Spatial and temporal derivatives of a perturbation

asked Apr 18 at 10:13

1 vote

0 answers

38 views

Gravitational potential for concentric spherical shells

asked May 17 at 18:13

0 votes

1 answer

30 views

Calculation about two-point correlation function in Fourier space

asked May 8 at 18:11

0 votes

1 answer

55 views

Calculating distance from the FRW metric

asked Jan 17 at 18:54

0 votes

1 answer

28 views

Elementary calculation of the critical density

asked Apr 4 at 14:52

0 votes

1 answer

39 views

Integration constant in $a(t)$ for the Einstein-de Sitter universe

asked Apr 9 at 18:48

0 votes

1 answer

72 views

Explanation for the value of the Hubble radius

asked Apr 10 at 9:15

0 votes

2 answers

63 views

Prove expression for center of mass of a curve [closed]

asked Feb 5, 2018 at 16:57

0 votes

1 answer

62 views

Variational method when the Hamiltonian commutes with the parity operator

asked Jul 6, 2020 at 9:54

0 votes

2 answers

64 views

Elementary question about the Euler-Lagrange equation

asked Nov 24, 2022 at 11:58

0 votes

1 answer

51 views

Elementary question about charge of doublet

asked Nov 27, 2022 at 18:19

0 votes

1 answer

75 views

Elementary question about Einstein notation

asked Dec 19, 2022 at 19:40

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25 Questions

Is the parity operator an observable?

Why do free-falling particles converge onto the Hubble flow?

Why is cosmological time unique?

Concept of distance in cosmology

Expected value of linear momentum with real wave function

Dimensionless power spectrum

Variation of resistance with temperature in semiconductors

Different definitions of recession velocity

Continuity equation for the conservation of energy from the conservation of the energy-momentum tensor

Upper index covariant derivative $\nabla^\mu$

Compute density of states in momentum space and in phase space

Contraction of distances in explanation of relativity of simultaneity in special relativity

How to express symmetry of a mixed (1,1) tensor with upper and lower index?

Spatial and temporal derivatives of a perturbation

Gravitational potential for concentric spherical shells

Calculation about two-point correlation function in Fourier space

Calculating distance from the FRW metric

Elementary calculation of the critical density

Integration constant in $a(t)$ for the Einstein-de Sitter universe

Explanation for the value of the Hubble radius

Prove expression for center of mass of a curve [closed]

Variational method when the Hamiltonian commutes with the parity operator

Elementary question about the Euler-Lagrange equation

Elementary question about charge of doublet

Elementary question about Einstein notation