User John Dumancic

105 votes

2 answers

7k views

Is there such thing as imaginary time dilation?

asked May 9, 2016 at 1:04

19 votes

2 answers

2k views

Why do we not observe a greater Casimir force than we do?

electromagnetism quantum-field-theory standard-model higgs casimir-effect

asked Jan 23, 2021 at 18:01

18 votes

3 answers

4k views

Does Heat Cause Time Dilation?

special-relativity relativity

asked May 27, 2016 at 13:44

3 votes

2 answers

226 views

Wouldn't a photon disappear because of length contraction? [duplicate]

special-relativity photons

asked Jul 15, 2016 at 0:40

3 votes

2 answers

380 views

Standard Model Lagrangian and Euler-Lagrange Equations

quantum-field-theory lagrangian-formalism standard-model

asked Sep 24, 2019 at 19:37

3 votes

1 answer

130 views

Understanding Shankar's standard deviation: Is $\langle\psi|\Omega|\psi\rangle$ shorthand for $\langle\psi|\Omega|\psi\rangle I$?

quantum-mechanics operators hilbert-space notation

asked Jul 20, 2019 at 2:16

2 votes

2 answers

288 views

Discretizing the Action for Feynman Path Integral

quantum-mechanics lagrangian-formalism harmonic-oscillator path-integral action

asked Nov 5, 2019 at 23:46

2 votes

3 answers

3k views

The electromagnetic field tensor in curvilinear coordinate systems

electromagnetism general-relativity tensor-calculus

asked Feb 21, 2017 at 0:15

2 votes

3 answers

752 views

The physical meaning of the cross-term of Kerr metric

general-relativity black-holes angular-momentum kerr-metric frame-dragging

asked Mar 1, 2017 at 18:03

1 vote

1 answer

139 views

$g^{\mu\nu}g_{\alpha\beta}$=?

metric-tensor relativity

asked Jun 25, 2019 at 20:39

1 vote

1 answer

111 views

Embedding manifold equipped with FLRW metric

general-relativity cosmology differential-geometry metric-tensor

asked Dec 2, 2019 at 17:48

1 vote

0 answers

35 views

Simple Pendulum with Arbitrary Velocity

classical-mechanics oscillators

asked Dec 13, 2019 at 21:25

1 vote

1 answer

132 views

Quantum Harmonic Oscillator- Solving the Differential Equation at a Limit

quantum-mechanics harmonic-oscillator differential-equations asymptotics

asked Sep 10, 2019 at 17:03

1 vote

1 answer

110 views

How does one add matter coupling terms to the linearized Lagrangian for General Relativity?

general-relativity perturbation-theory stress-energy-momentum-tensor linearized-theory

asked Sep 22, 2020 at 17:48

1 vote

0 answers

284 views

Deriving the effective potential from the Schwarzschild metric

homework-and-exercises general-relativity metric-tensor orbital-motion geodesics

asked Sep 23, 2020 at 1:29

1 vote

3 answers

553 views

Recommended Textbook for Heisenberg Picture

quantum-mechanics resource-recommendations

asked Jan 16, 2017 at 2:35

1 vote

1 answer

94 views

How to compute normalization of one-particle states for Klein-Gordon field quantization

quantum-field-theory hilbert-space klein-gordon-equation normalization

asked Jan 12, 2021 at 2:16

0 votes

1 answer

102 views

In an accelerating reference frame, does the angular acceleration of a rolling wheel change?

newtonian-mechanics rotational-kinematics

asked Mar 19, 2021 at 16:45

0 votes

0 answers

66 views

Why does this method of deriving the classical free particle Lagrangian not work?

special-relativity classical-mechanics lagrangian-formalism metric-tensor action

asked Nov 17, 2020 at 21:18

0 votes

1 answer

119 views

Dimensionality of a Hilbert Space: Countable or Uncountable? [duplicate]

quantum-mechanics hilbert-space

asked Jun 14, 2020 at 2:22

0 votes

1 answer

42 views

What is the function for the magnitude of air resistance/drag?

forces fluid-dynamics drag viscosity turbulence

asked Jun 25, 2020 at 13:20

0 votes

3 answers

6k views

Are light waves sinusoidal functions? [duplicate]

visible-light waves

asked Jun 1, 2016 at 17:00

0 votes

0 answers

54 views

Negative Mass's Effect on Gravitational Time Dilation [duplicate]

general-relativity gravity time-dilation

asked May 9, 2016 at 13:50

-1 votes

2 answers

137 views

Understanding Conservation of Momentum in Multiple Particle Systems

newtonian-mechanics forces momentum conservation-laws

asked Oct 26, 2016 at 23:40

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24 Questions

Is there such thing as imaginary time dilation?

Why do we not observe a greater Casimir force than we do?

Does Heat Cause Time Dilation?

Wouldn't a photon disappear because of length contraction? [duplicate]

Standard Model Lagrangian and Euler-Lagrange Equations

Understanding Shankar's standard deviation: Is $\langle\psi|\Omega|\psi\rangle$ shorthand for $\langle\psi|\Omega|\psi\rangle I$?

Discretizing the Action for Feynman Path Integral

The electromagnetic field tensor in curvilinear coordinate systems

The physical meaning of the cross-term of Kerr metric

$g^{\mu\nu}g_{\alpha\beta}$=?

Embedding manifold equipped with FLRW metric

Simple Pendulum with Arbitrary Velocity

Quantum Harmonic Oscillator- Solving the Differential Equation at a Limit

How does one add matter coupling terms to the linearized Lagrangian for General Relativity?

Deriving the effective potential from the Schwarzschild metric

Recommended Textbook for Heisenberg Picture

How to compute normalization of one-particle states for Klein-Gordon field quantization

In an accelerating reference frame, does the angular acceleration of a rolling wheel change?

Why does this method of deriving the classical free particle Lagrangian not work?

Dimensionality of a Hilbert Space: Countable or Uncountable? [duplicate]

What is the function for the magnitude of air resistance/drag?

Are light waves sinusoidal functions? [duplicate]

Negative Mass's Effect on Gravitational Time Dilation [duplicate]

Understanding Conservation of Momentum in Multiple Particle Systems