User yuggib

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Why isn't the path integral rigorous?

answered Mar 11, 2015 at 9:25

17 votes

Electromagnetic field and continuous and differentiable vector fields

answered Sep 1, 2014 at 8:26

14 votes

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How to determine the observables rigorously?

answered Sep 4, 2015 at 9:10

13 votes

What is going on in the photon-photon scattering Feynman diagram?

answered Sep 7, 2015 at 12:55

13 votes

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Infinite dimensional vector spaces vs. the dual space

answered Dec 14, 2014 at 11:17

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Non-separable solutions of the Schroedinger equation

answered May 11, 2016 at 8:41

13 votes

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Is the usage of the Fock space a postulate in QFT?

answered Jun 23, 2016 at 12:23

12 votes

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How do you go from quantum electrodynamics to Maxwell's equations?

answered Aug 29, 2014 at 14:14

11 votes

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$p^4$ in radial coordinates not Hermitian

answered Apr 5, 2015 at 8:50

11 votes

Can a physical wavefunction be non-smooth or even discontinuous?

answered Jun 15, 2016 at 7:23

11 votes

Why is a Hermitian operator a "quantum random variable"?

answered Jun 14, 2016 at 1:31

11 votes

Logarithm of Operators in Quantum Mechanics

answered Dec 3, 2018 at 14:50

11 votes

Why is an operator the quantum mechanical analogue of an observable?

answered Apr 24, 2019 at 13:17

11 votes

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Does every ray in the Hilbert space of a system correspond to one and only one physical state and vice versa?

answered Feb 4, 2020 at 8:23

10 votes

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Uniqueness of bra-ket correspondence

answered Oct 22, 2019 at 6:51

10 votes

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Classical field limit of the electron quantum field

answered Mar 24, 2016 at 8:35

10 votes

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States in QM and in the algebraic approach

answered Feb 9, 2018 at 18:29

10 votes

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Can a perfectly mathematically describable universe exist in a multiverse?

answered Apr 29, 2015 at 12:06

10 votes

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Physical reason why the derivative of a wavefunction has to be continuous?

answered May 28, 2015 at 13:25

10 votes

What exactly is a bound state and why does it have negative energy?

answered Jun 21, 2014 at 23:20

9 votes

Is a "third quantization" possible?

answered Jun 16, 2014 at 9:53

9 votes

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Does Heisenberg equation of motion imply the Schrodinger equation for evolution operator?

answered Jul 2, 2014 at 8:45

9 votes

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Is the Klein-Gordon Hamiltonian unbounded below?

answered Jul 3, 2015 at 14:25

9 votes

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Physics journals that focus on expository work

answered Jul 16, 2015 at 7:46

9 votes

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Realistic interacting QFT construction

answered May 6, 2015 at 10:56

9 votes

If an isolated quantum system consists of only one particle, is it possible for it to be in a mixed state?

answered Jun 13, 2016 at 10:17

9 votes

Newton's law requires two initial conditions while the Taylor series requires infinite!

answered Jun 25, 2018 at 13:53

8 votes

Domains of $H$ and $U(t) = \exp(-iH t )$

answered Dec 14, 2018 at 9:42

8 votes

How can dimensional regularization "analytically continue" from a discrete set?

answered May 5, 2016 at 7:06

8 votes

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Is it possible to go from the Master Equation formalism to Heisenberg-Langevin equations

answered Jun 19, 2015 at 15:14

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268 Answers

Why isn't the path integral rigorous?

Electromagnetic field and continuous and differentiable vector fields

How to determine the observables rigorously?

What is going on in the photon-photon scattering Feynman diagram?

Infinite dimensional vector spaces vs. the dual space

Non-separable solutions of the Schroedinger equation

Is the usage of the Fock space a postulate in QFT?

How do you go from quantum electrodynamics to Maxwell's equations?

$p^4$ in radial coordinates not Hermitian

Can a physical wavefunction be non-smooth or even discontinuous?

Why is a Hermitian operator a "quantum random variable"?

Logarithm of Operators in Quantum Mechanics

Why is an operator the quantum mechanical analogue of an observable?

Does every ray in the Hilbert space of a system correspond to one and only one physical state and vice versa?

Uniqueness of bra-ket correspondence

Classical field limit of the electron quantum field

States in QM and in the algebraic approach

Can a perfectly mathematically describable universe exist in a multiverse?

Physical reason why the derivative of a wavefunction has to be continuous?

What exactly is a bound state and why does it have negative energy?

Is a "third quantization" possible?

Does Heisenberg equation of motion imply the Schrodinger equation for evolution operator?

Is the Klein-Gordon Hamiltonian unbounded below?

Physics journals that focus on expository work

Realistic interacting QFT construction

If an isolated quantum system consists of only one particle, is it possible for it to be in a mixed state?

Newton's law requires two initial conditions while the Taylor series requires infinite!

Domains of $H$ and $U(t) = \exp(-iH t )$

How can dimensional regularization "analytically continue" from a discrete set?

Is it possible to go from the Master Equation formalism to Heisenberg-Langevin equations