User DJA - Physics Stack Exchange

34 votes

5 answers

16k views

Heisenberg Uncertainty Principle Applied to an infinite square well

asked May 24, 2017 at 20:52

3 votes

2 answers

2k views

Question regarding the frequency of a cyclotron:

asked May 9, 2017 at 15:45

3 votes

2 answers

4k views

Direction of spin of a particle after parity transformation

asked Jan 5, 2018 at 21:18

3 votes

1 answer

2k views

Decay width of the tau lepton

asked Apr 8, 2019 at 7:27

3 votes

2 answers

250 views

Understanding the density operator in quantum mechanics for a joint system

asked Nov 28, 2020 at 22:49

2 votes

0 answers

95 views

Difference between Fixed Nuclei approximation, Born-Oppenheimer approximation, adiabatic nuclei approximation

asked Jan 24, 2021 at 1:35

2 votes

1 answer

2k views

Quantum Mechanics Spectral decomposition misunderstanding

asked Sep 17, 2020 at 10:56

2 votes

1 answer

254 views

Heisenberg uncertainty principle meaning and using it to determine approximate sizes confusion

asked Jan 17, 2019 at 22:52

1 vote

0 answers

158 views

Derive the virial theorem from hydrostatic equikibrium

asked Feb 20, 2019 at 15:33

1 vote

1 answer

356 views

Clausius Inequality application to engine

asked Apr 13, 2018 at 18:58

1 vote

4 answers

1k views

Momentum of an ultrarelativistic electron

asked Oct 24, 2018 at 15:07

1 vote

2 answers

671 views

Feynman diagram for semileptonic decay of neutral kaon

asked Mar 26, 2019 at 19:57

1 vote

2 answers

7k views

Hermitian operator followed by another hermitian operator – is it also hermitian?

asked Dec 17, 2017 at 20:54

1 vote

2 answers

348 views

Two field form of the Maxwell equations: Why are effects due to polarisation ignored.

asked Apr 23, 2018 at 10:16

1 vote

1 answer

305 views

Proper time Relativity

asked May 30, 2017 at 0:35

1 vote

1 answer

532 views

Why do relativistic effects that cause contraction of the $s$ and $p$ orbitals impact the $s$ and $o$ orbitals further away from the nucleus?

asked Feb 1, 2021 at 4:58

1 vote

2 answers

7k views

Converting energy from units of joules into units of wavenumber

asked Feb 1, 2021 at 21:30

1 vote

1 answer

1k views

Determining the probability of measuring a particular eigenvalue for angular momentum given the angular wave function

asked Feb 1, 2021 at 22:41

1 vote

2 answers

111 views

Finding the trace of a system explicitly

asked Nov 29, 2020 at 2:28

1 vote

1 answer

159 views

Calculating the reduced density matrix of two separate experiments

asked Nov 30, 2020 at 19:41

1 vote

2 answers

124 views

Rate of change of position coordinate with respect to proper time for a particle moving in the Schwarzschild spacetime

asked Dec 5, 2020 at 4:29

1 vote

1 answer

181 views

Understanding where all the equations from a covariant derivative of a tensor come from

asked Dec 6, 2020 at 1:58

1 vote

1 answer

129 views

WKB approximation difficulty - deciding what term to neglect

asked Oct 8, 2020 at 19:36

1 vote

1 answer

186 views

Turning a bra made up of a tensor product of two bras into a ket (and vice-versa)

asked Oct 18, 2020 at 16:40

1 vote

1 answer

283 views

Finding the probability of measuring a particular eigenvalue of an operator for a system after time evolution

asked Oct 28, 2020 at 0:12

1 vote

2 answers

626 views

If two operators are related to each other by a unitary operator, are their eigenvalues the same?

asked Nov 6, 2020 at 22:00

1 vote

2 answers

2k views

Finding the Full width half maximum of a function

asked Nov 19, 2020 at 1:44

1 vote

2 answers

2k views

Understanding the density matrix for systems in thermal equilibrium

asked Dec 25, 2020 at 1:55

1 vote

2 answers

1k views

Derivative of unitary time evolution operator

asked Apr 7, 2021 at 18:46

1 vote

2 answers

855 views

How does the tranpose conjugate of an operator act on a bra and a ket in the context of annihilation and raising operators?

asked Apr 8, 2021 at 19:25

Stack Exchange Network

73 Questions

Heisenberg Uncertainty Principle Applied to an infinite square well

Question regarding the frequency of a cyclotron:

Direction of spin of a particle after parity transformation

Decay width of the tau lepton

Understanding the density operator in quantum mechanics for a joint system

Difference between Fixed Nuclei approximation, Born-Oppenheimer approximation, adiabatic nuclei approximation

Quantum Mechanics Spectral decomposition misunderstanding

Heisenberg uncertainty principle meaning and using it to determine approximate sizes confusion

Derive the virial theorem from hydrostatic equikibrium

Clausius Inequality application to engine

Momentum of an ultrarelativistic electron

Feynman diagram for semileptonic decay of neutral kaon

Hermitian operator followed by another hermitian operator – is it also hermitian?

Two field form of the Maxwell equations: Why are effects due to polarisation ignored.

Proper time Relativity

Why do relativistic effects that cause contraction of the $s$ and $p$ orbitals impact the $s$ and $o$ orbitals further away from the nucleus?

Converting energy from units of joules into units of wavenumber

Determining the probability of measuring a particular eigenvalue for angular momentum given the angular wave function

Finding the trace of a system explicitly

Calculating the reduced density matrix of two separate experiments

Rate of change of position coordinate with respect to proper time for a particle moving in the Schwarzschild spacetime

Understanding where all the equations from a covariant derivative of a tensor come from

WKB approximation difficulty - deciding what term to neglect

Turning a bra made up of a tensor product of two bras into a ket (and vice-versa)

Finding the probability of measuring a particular eigenvalue of an operator for a system after time evolution

If two operators are related to each other by a unitary operator, are their eigenvalues the same?

Finding the Full width half maximum of a function

Understanding the density matrix for systems in thermal equilibrium

Derivative of unitary time evolution operator

How does the tranpose conjugate of an operator act on a bra and a ket in the context of annihilation and raising operators?