User AccidentalFourierTransform - Physics Stack Exchange

98 votes

What is a complete book for introductory quantum field theory?

answered Jan 20, 2018 at 0:22

64 votes

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Why do excited states decay if they are eigenstates of Hamiltonian and should not change in time?

answered Nov 28, 2016 at 14:55

45 votes

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I'm missing the point of renormalization in QFT

answered Feb 9, 2022 at 11:30

44 votes

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Lorentz invariance of the Minkowski metric

answered Jan 19, 2016 at 17:14

41 votes

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What is the issue with interactions in QFT?

answered May 2, 2017 at 21:06

37 votes

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Why are relativistic quantum field theories so much more restrictive than non-relativistic ones?

answered Mar 31, 2018 at 17:52

37 votes

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Systematic way to draw all inequivalent Feynman diagrams

answered Mar 26, 2018 at 0:19

36 votes

How can we see an atom now? What was the scale of this equipment?

answered Feb 14, 2018 at 15:55

31 votes

Highly nonlinear equations

answered Dec 5, 2016 at 11:40

29 votes

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Quantum Field Theory in position space instead of momentum space?

answered Dec 20, 2016 at 15:19

27 votes

Books for particle physics and the Standard Model

answered Jan 6, 2018 at 13:46

26 votes

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Feynman diagram and uncertainty

answered Dec 6, 2016 at 17:38

26 votes

What are the next generation physics experiments?

answered Apr 18, 2016 at 16:20

24 votes

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What is the physical importance of topological quantum field theory?

answered Mar 31, 2021 at 22:38

23 votes

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Why is Fourier space called as momentum space?

answered Jan 2, 2018 at 19:23

23 votes

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Where does the $i$ come from in the Schrödinger equation?

answered Feb 19, 2016 at 13:54

22 votes

In a universe with four spatial dimensions would there be elementary particles with intrinsic isoclinic spin?

answered Aug 10, 2018 at 14:51

21 votes

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Locality in QFT vs "non-local" in QM

answered Nov 6, 2017 at 19:15

21 votes

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First quantization vs second quantization

answered May 2, 2017 at 12:54

21 votes

How is the Schroedinger equation a wave equation?

answered May 17, 2017 at 13:35

20 votes

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How does $\epsilon \mu = 1/c_m^2$ change when $\mu$ or $\epsilon$ (permeability or permittivity) is a tensor?

answered Dec 26, 2016 at 19:43

20 votes

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What does the identity operator look like in Quantum Field Theory?

answered Jan 31, 2018 at 15:29

19 votes

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Does a non-lagrangian field theory have a stress-energy tensor?

answered Dec 26, 2020 at 21:27

19 votes

Haag's comment on the relation between fields and particles

answered Aug 4, 2020 at 19:32

18 votes

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QED and anomaly

answered Feb 27, 2017 at 15:32

18 votes

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Born Interpretation of Wave Function

answered Jul 20, 2015 at 14:25

17 votes

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A question on using Fourier decomposition to solve the Klein-Gordon equation

answered Nov 2, 2015 at 17:05

17 votes

What is known about the hydrogen atom in $d$ spatial dimensions?

answered May 15, 2016 at 10:14

17 votes

Non-Perturbative Feynman diagrams?

answered Sep 27, 2017 at 18:21

16 votes

Accepted

Form of Schrödinger equation for the probability density

answered Dec 7, 2017 at 10:57

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506 Answers

What is a complete book for introductory quantum field theory?

Why do excited states decay if they are eigenstates of Hamiltonian and should not change in time?

I'm missing the point of renormalization in QFT

Lorentz invariance of the Minkowski metric

What is the issue with interactions in QFT?

Why are relativistic quantum field theories so much more restrictive than non-relativistic ones?

Systematic way to draw all inequivalent Feynman diagrams

How can we see an atom now? What was the scale of this equipment?

Highly nonlinear equations

Quantum Field Theory in position space instead of momentum space?

Books for particle physics and the Standard Model

Feynman diagram and uncertainty

What are the next generation physics experiments?

What is the physical importance of topological quantum field theory?

Why is Fourier space called as momentum space?

Where does the $i$ come from in the Schrödinger equation?

In a universe with four spatial dimensions would there be elementary particles with intrinsic isoclinic spin?

Locality in QFT vs "non-local" in QM

First quantization vs second quantization

How is the Schroedinger equation a wave equation?

How does $\epsilon \mu = 1/c_m^2$ change when $\mu$ or $\epsilon$ (permeability or permittivity) is a tensor?

What does the identity operator look like in Quantum Field Theory?

Does a non-lagrangian field theory have a stress-energy tensor?

Haag's comment on the relation between fields and particles

QED and anomaly

Born Interpretation of Wave Function

A question on using Fourier decomposition to solve the Klein-Gordon equation

What is known about the hydrogen atom in $d$ spatial dimensions?

Non-Perturbative Feynman diagrams?

Form of Schrödinger equation for the probability density