User CBBAM

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1 answer

321 views

Why does QFT require operator-valued distributions? [duplicate]

asked Sep 28, 2022 at 20:24

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1 answer

104 views

Unclear on spacetime vectors

asked Nov 4, 2022 at 21:50

1 vote

1 answer

104 views

Why is particle creation and annihilation not observed on a macro scale?

asked Dec 10, 2022 at 8:08

1 vote

2 answers

461 views

How does a field $\phi(x,t)$ have infinite degrees of freedom and why are its inputs labels not variables?

asked Dec 13, 2022 at 7:53

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2 answers

81 views

What does it mean for two quantities on equal footing?

asked Dec 7, 2022 at 8:09

1 vote

1 answer

81 views

How does $\langle 1/t\rangle$ denote a rate?

asked Feb 7, 2021 at 7:34

1 vote

1 answer

325 views

Why must we take the orthogonal projection to determine the probability distribution for measuring a self-adjoint operator?

asked Jun 29, 2022 at 5:25

0 votes

1 answer

301 views

As written, how is the spectral theorem useful?

asked Jul 6, 2022 at 2:21

0 votes

1 answer

75 views

Motivation behind defining new measures?

asked Jul 16, 2022 at 18:53

0 votes

2 answers

728 views

Navier-Stokes Equations in Einstein Notation and its relation to Poisson's Equation

asked Jul 28, 2022 at 20:43

0 votes

2 answers

283 views

In an $n$ particle system, why is the Hamiltonian summed over $n$?

asked Jun 17, 2022 at 6:07

0 votes

1 answer

206 views

Integration by Parts in Liouville's Theorem

asked Jun 18, 2022 at 4:06

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2 answers

211 views

Why are Hamilton's equations sometimes written with a gradient?

asked Jun 21, 2022 at 23:08

0 votes

1 answer

58 views

Physical interpretation of negative total energy

asked Jun 23, 2022 at 18:09

0 votes

2 answers

196 views

What makes the mixing of two fluids turbulent?

asked Aug 2, 2021 at 23:06

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2 answers

88 views

On the phase-invariance of vectors in quantum mechanics

asked Sep 10, 2022 at 20:06

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2 answers

127 views

Relationship between work and potential energy

asked Sep 21, 2022 at 5:56

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1 answer

401 views

Geometric interpretation of tensor product

asked Sep 22, 2022 at 20:02

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2 answers

325 views

How do we know that the operator $U(t) = e^{-itH/\hbar}$ corresponds to time?

asked Dec 18, 2022 at 9:14

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1 answer

549 views

How does the Klein-Gordon equation represent a classical field? [duplicate]

asked Dec 21, 2022 at 3:12

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1 answer

210 views

Calculation of one-loop diagram in $\phi^4$ theory

asked Mar 8, 2023 at 2:36

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0 answers

61 views

How is the dimension of the vector space we represent $SO(3)$ on determined when discussing the spin of a particle?

asked Jul 26, 2023 at 21:43

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0 answers

132 views

Calculating the contraction of a field operator and a creation operator

asked Dec 25, 2022 at 6:48

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1 answer

220 views

How do we determine momentum when going from position space to momentum space in Feynman diagrams?

asked Dec 28, 2022 at 0:22

0 votes

0 answers

101 views

Understanding Feynman parameterization

asked Jan 5, 2023 at 9:38

0 votes

1 answer

351 views

Generalized vs conjugate momenta

asked Jan 30, 2023 at 8:59

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1 answer

536 views

Why is the wave function of a particle with definite momentum $p$ given as $e^{ipx/\hbar}$?

asked Feb 2, 2023 at 6:20

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0 answers

72 views

How does rotation appear in the components of the angular momentum operator?

asked Feb 20, 2023 at 6:52

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0 answers

35 views

Why are gauge theories so significant? [duplicate]

asked Feb 11, 2023 at 19:07

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0 answers

68 views

What is the relationship between mass and the exponential decay of correlation functions?

asked Sep 17 at 18:24

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134 Questions

Why does QFT require operator-valued distributions? [duplicate]

Unclear on spacetime vectors

Why is particle creation and annihilation not observed on a macro scale?

How does a field $\phi(x,t)$ have infinite degrees of freedom and why are its inputs labels not variables?

What does it mean for two quantities on equal footing?

How does $\langle 1/t\rangle$ denote a rate?

Why must we take the orthogonal projection to determine the probability distribution for measuring a self-adjoint operator?

As written, how is the spectral theorem useful?

Motivation behind defining new measures?

Navier-Stokes Equations in Einstein Notation and its relation to Poisson's Equation

In an $n$ particle system, why is the Hamiltonian summed over $n$?

Integration by Parts in Liouville's Theorem

Why are Hamilton's equations sometimes written with a gradient?

Physical interpretation of negative total energy

What makes the mixing of two fluids turbulent?

On the phase-invariance of vectors in quantum mechanics

Relationship between work and potential energy

Geometric interpretation of tensor product

How do we know that the operator $U(t) = e^{-itH/\hbar}$ corresponds to time?

How does the Klein-Gordon equation represent a classical field? [duplicate]

Calculation of one-loop diagram in $\phi^4$ theory

How is the dimension of the vector space we represent $SO(3)$ on determined when discussing the spin of a particle?

Calculating the contraction of a field operator and a creation operator

How do we determine momentum when going from position space to momentum space in Feynman diagrams?

Understanding Feynman parameterization

Generalized vs conjugate momenta

Why is the wave function of a particle with definite momentum $p$ given as $e^{ipx/\hbar}$?

How does rotation appear in the components of the angular momentum operator?

Why are gauge theories so significant? [duplicate]

What is the relationship between mass and the exponential decay of correlation functions?