User wrb98

3 votes

1 answer

73 views

Sound Speed in Cosmological Perturbation Theory

asked May 14, 2021 at 14:55

2 votes

1 answer

135 views

Derivation of scaled Richardson number and speed of internal gravity waves for density stratified fluid

fluid-dynamics fluid-statics

asked Oct 24, 2019 at 20:43

2 votes

1 answer

79 views

Adjoint operators and the method of variation for the Orr-Sommerfield problem

fluid-dynamics variational-principle variational-calculus

asked Nov 28, 2019 at 16:32

1 vote

0 answers

66 views

Quantum solitons: derivation of $ \int {\phi^\prime}^2 dx = M$ using Lorentz invariance

quantum-mechanics quantum-field-theory classical-mechanics classical-field-theory solitons

asked Jan 8, 2020 at 17:38

1 vote

1 answer

97 views

Questions relating to stability of plane Couette flow

fluid-dynamics

asked Nov 21, 2019 at 19:41

1 vote

1 answer

224 views

Comoving frames and peculiar velocity in cosmology

cosmology reference-frames velocity

asked Apr 11, 2021 at 12:50

1 vote

1 answer

116 views

Raising and lowering indices in line elements - why do we raise and lower them in line elements?

cosmology metric-tensor tensor-calculus notation

asked Apr 8, 2021 at 18:55

1 vote

0 answers

265 views

Ricci tensor for FRW Metric [closed]

homework-and-exercises general-relativity cosmology metric-tensor curvature

asked Apr 23, 2021 at 17:50

1 vote

2 answers

99 views

Cosmology - Confusion About Visualising the Universe as the Surface of a 3-Sphere

cosmology spacetime metric-tensor universe topology

asked Apr 25, 2021 at 13:02

1 vote

0 answers

27 views

Total number of observable light sources in cosmology

cosmology astrophysics

asked Apr 25, 2021 at 20:26

1 vote

0 answers

34 views

Four Momentum in an Isotropic and Homogeneous Universe

cosmology astrophysics astronomy space-expansion

asked Jun 3, 2021 at 11:37

1 vote

1 answer

29 views

Antiplane shearing: singularities of $\vert\nabla\Phi\vert$

complex-numbers solid-mechanics

asked Sep 17, 2018 at 18:19

0 votes

1 answer

20 views

Energy density of a neutrino species

energy particle-physics cosmology integration neutrinos

asked Jun 10, 2021 at 0:20

0 votes

0 answers

34 views

Lorentz Transformation - Representation for Rotations, the Scalar Product and Kronecker Delta

special-relativity dirac-equation dirac-matrices

asked Nov 16, 2021 at 20:28

0 votes

0 answers

14 views

Ratio of specific entropy after a particle decay

cosmology radiation big-bang nucleosynthesis

asked Mar 28 at 21:15

0 votes

1 answer

93 views

Comoving Hubble radius in terms of expansion scale factor

cosmology space-expansion cosmological-inflation space

asked May 4, 2021 at 17:21

0 votes

1 answer

164 views

Visualising the Comoving Hubble Sphere

cosmology cosmological-inflation

asked May 4, 2021 at 17:27

0 votes

0 answers

24 views

Confusing index notation in cosmological perturbation theory

cosmology space-expansion notation cosmological-inflation

asked May 11, 2021 at 22:59

0 votes

2 answers

58 views

Gravitational Time Dilation and Equivalence Principle

general-relativity gravity spacetime time time-dilation

asked Apr 10, 2021 at 20:54

0 votes

1 answer

44 views

Cosmological models of the expansion of the universe for different curvatures

cosmology astrophysics cosmological-inflation

asked Jun 2, 2021 at 15:34

0 votes

2 answers

72 views

Cosmology and Spherical Coordinates

general-relativity cosmology differential-geometry coordinate-systems

asked Apr 12, 2021 at 22:37

0 votes

0 answers

77 views

Cosmology - The Geodesic Equation Derivation

general-relativity cosmology geodesics

asked Apr 14, 2021 at 15:26

0 votes

1 answer

54 views

Isotropic Universe and the mean of a 3-vector

cosmology

asked Apr 15, 2021 at 13:47

0 votes

1 answer

230 views

Four-Vector For Number Flux of Particles

special-relativity cosmology vector-fields

asked Apr 15, 2021 at 15:43

0 votes

1 answer

44 views

Four-vector formulation of electromagnetic quantities

electromagnetism special-relativity

asked Apr 15, 2021 at 17:00

0 votes

1 answer

42 views

Extensional flow of a long thin thread

fluid-dynamics

asked Apr 6, 2021 at 21:21

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26 Questions

Sound Speed in Cosmological Perturbation Theory

Derivation of scaled Richardson number and speed of internal gravity waves for density stratified fluid

Adjoint operators and the method of variation for the Orr-Sommerfield problem

Quantum solitons: derivation of $ \int {\phi^\prime}^2 dx = M$ using Lorentz invariance

Questions relating to stability of plane Couette flow

Comoving frames and peculiar velocity in cosmology

Raising and lowering indices in line elements - why do we raise and lower them in line elements?

Ricci tensor for FRW Metric [closed]

Cosmology - Confusion About Visualising the Universe as the Surface of a 3-Sphere

Total number of observable light sources in cosmology

Four Momentum in an Isotropic and Homogeneous Universe

Antiplane shearing: singularities of $\vert\nabla\Phi\vert$

Energy density of a neutrino species

Lorentz Transformation - Representation for Rotations, the Scalar Product and Kronecker Delta

Ratio of specific entropy after a particle decay

Comoving Hubble radius in terms of expansion scale factor

Visualising the Comoving Hubble Sphere

Confusing index notation in cosmological perturbation theory

Gravitational Time Dilation and Equivalence Principle

Cosmological models of the expansion of the universe for different curvatures

Cosmology and Spherical Coordinates

Cosmology - The Geodesic Equation Derivation

Isotropic Universe and the mean of a 3-vector

Four-Vector For Number Flux of Particles

Four-vector formulation of electromagnetic quantities

Extensional flow of a long thin thread