User Arnold Neumaier

13 votes

What is a mass gap?

answered Jun 22, 2012 at 12:29

13 votes

Accepted

EM wave function & photon wavefunction

answered May 21, 2012 at 12:22

13 votes

Are elementary particles actually more elementary than quasiparticles?

answered Mar 6, 2012 at 13:15

13 votes

Why Does Renormalized Perturbation Theory Work?

answered Jun 15, 2016 at 6:44

13 votes

Does non-conservation of number of particles imply zero chemical potential?

answered Jan 9, 2017 at 18:59

13 votes

Quantum Wave Mechanics

answered Mar 16, 2014 at 9:45

13 votes

In what sense is a scalar field observable in QFT?

answered Mar 21, 2014 at 16:20

12 votes

Are vacuum fluctuations really happening all the time?

answered Nov 8, 2016 at 17:27

12 votes

What's the difference between space and time?

answered Dec 6, 2012 at 21:12

12 votes

Accepted

What are distinguishable and indistinguishable particles in statistical mechanics?

answered Sep 16, 2012 at 10:43

11 votes

Accepted

Is there a difference between a postulate and a principle in physics?

answered Sep 5, 2012 at 8:45

11 votes

Crash course in classical thermodynamics

answered Sep 13, 2012 at 9:15

11 votes

How to get Planck length

answered May 21, 2012 at 15:00

11 votes

Is there any proof for the 2nd law of thermodynamics?

answered Mar 3, 2012 at 23:52

11 votes

Irreducible representation in physics

answered Mar 2, 2012 at 22:55

11 votes

Accepted

What is a general definition of the spin of a particle?

answered Mar 16, 2012 at 14:41

11 votes

Different kinds of S-matrices?

answered Mar 12, 2012 at 17:55

11 votes

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Operator that describes particle detector

answered Oct 31, 2013 at 13:00

11 votes

Classical limit of quantum mechanics

answered Nov 23, 2012 at 11:38

11 votes

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How to tell local and non-local in QFT?

answered Nov 8, 2012 at 17:51

11 votes

What equation of state is needed for liquid states?

answered Oct 15, 2012 at 12:11

11 votes

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How can I find a very old paper by W.L. Bragg from 1913?

answered Oct 10, 2012 at 15:47

11 votes

Relativity of temperature paradox

answered Jun 17, 2016 at 12:38

10 votes

Uniqueness of Yang-Mills theory

answered Jul 18, 2017 at 6:03

10 votes

Why are one-particle states called irreducible representations of Poincaré group?

answered Dec 30, 2015 at 11:51

10 votes

Are negative temperatures typically associated with negative absolute pressures?

answered Oct 3, 2012 at 9:42

10 votes

Accepted

What makes a Feynman diagram real or virtual?

answered Oct 23, 2012 at 9:20

10 votes

What really is Spacetime?

answered Oct 22, 2012 at 7:17

10 votes

In quantum field theory with a mass gap, why do states in the asymptotic future/past turn out to have a Fock space structure?

answered Oct 19, 2012 at 14:41

10 votes

Accepted

Is the structural similarity between atoms ( smallest) and universe (biggest) a conincidence. Or there can a reason for this beyond imaginations

answered Nov 15, 2012 at 15:33

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663 Answers

What is a mass gap?

EM wave function & photon wavefunction

Are elementary particles actually more elementary than quasiparticles?

Why Does Renormalized Perturbation Theory Work?

Does non-conservation of number of particles imply zero chemical potential?

Quantum Wave Mechanics

In what sense is a scalar field observable in QFT?

Are vacuum fluctuations really happening all the time?

What's the difference between space and time?

What are distinguishable and indistinguishable particles in statistical mechanics?

Is there a difference between a postulate and a principle in physics?

Crash course in classical thermodynamics

How to get Planck length

Is there any proof for the 2nd law of thermodynamics?

Irreducible representation in physics

What is a general definition of the spin of a particle?

Different kinds of S-matrices?

Operator that describes particle detector

Classical limit of quantum mechanics

How to tell local and non-local in QFT?

What equation of state is needed for liquid states?

How can I find a very old paper by W.L. Bragg from 1913?

Relativity of temperature paradox

Uniqueness of Yang-Mills theory

Why are one-particle states called irreducible representations of Poincaré group?

Are negative temperatures typically associated with negative absolute pressures?

What makes a Feynman diagram real or virtual?

What really is Spacetime?

In quantum field theory with a mass gap, why do states in the asymptotic future/past turn out to have a Fock space structure?

Is the structural similarity between atoms ( smallest) and universe (biggest) a conincidence. Or there can a reason for this beyond imaginations