User Astute Reader - Physics Stack Exchange

92 votes

Hypothetically, why can't we wrap copper wires around car axles and turn them into electromagnets to help charge the batteries?

answered Jan 23, 2021 at 1:12

28 votes

How do I interpret uncertainty in velocity greater than the speed of light?

answered Aug 5, 2020 at 15:50

11 votes

Does perfect knowledge of momentum of a free particle imply that there is a finite probability of finding free particle anywhere in the universe?

answered Jun 23, 2023 at 14:47

8 votes

How $[x,p]=i \hbar$ implies that $x$ and $p$ do not have simultaneous eigenstates?

answered Feb 24, 2021 at 14:20

8 votes

Accepted

Lagrangian potential for Newtonian gravity

answered Aug 3, 2020 at 19:45

8 votes

Accepted

Thought experiment with particle in a 1d potential well

answered Aug 15, 2020 at 21:41

7 votes

Accepted

LSZ reduction formula (Schwartz)

answered Sep 3, 2020 at 22:51

7 votes

Why does a body accelerate when there is a force applied to it?

answered Dec 5, 2021 at 2:08

6 votes

Is there a classical quantum mechanics?

answered Jun 5, 2021 at 22:56

6 votes

Accepted

What is the relationship between lattice field theory and grid-based numerical methods?

answered Sep 25, 2020 at 20:55

6 votes

An integral in Peskin & Schroeder's Quantum Field Theory p. 27

answered Jun 5, 2020 at 19:07

5 votes

What does $V(r)$ mean in the Schrodinger equation?

answered Sep 25, 2020 at 14:29

4 votes

Accepted

Does $L\cdot S$ commute with $J^2$?

answered Nov 29, 2020 at 17:42

4 votes

Accepted

Infinitesimal generator of change of basis (Fock Space)

answered Dec 19, 2020 at 20:39

4 votes

Why is curved space able to change an object's velocity (vector)?

answered Aug 17, 2020 at 2:14

4 votes

What is the source of light in Cherenkov radiation?

answered Aug 6, 2020 at 15:21

4 votes

Three integrals in Peskin's Textbook

answered Jun 5, 2020 at 18:37

4 votes

Why do the counterterms in renormalized $\phi^4$-theory with power two in fields give vertices and not propagators?

answered Jul 13, 2020 at 20:05

4 votes

What makes the electron, as an excitation in a field, discrete?

answered Aug 4, 2020 at 17:50

4 votes

Accepted

Understanding Quantum Spin as a Vector And Spin Operators

answered Aug 10, 2020 at 20:03

4 votes

Accepted

What happens if we suddenly change the potential in Schrodinger equation?

answered Dec 15, 2020 at 2:11

4 votes

Accepted

Why does the time translation operator have a different sign than the time evolution operator?

answered Jan 20, 2021 at 23:29

4 votes

$S$-matrix from LSZ

answered Jul 10, 2023 at 23:23

3 votes

Why are only positive frequency mode functions allowed in Quantum field theory? How is this consistent with anti particles having negative energy?

answered Nov 19, 2021 at 14:15

3 votes

Accepted

Lorentz group generators and its dimensionality

answered Dec 14, 2020 at 15:15

3 votes

Accepted

Magnet Field and Electric field representation image misunderstanding

answered Dec 17, 2020 at 14:22

3 votes

How to derive the formula for the quantum Hamiltonian $\hat H(\hat P,\hat Q)$ in terms of the classical $H(q,p)$, via Weyl Ordering?

answered May 12, 2021 at 12:11

3 votes

If a photon takes all possible paths, does it travel faster than light?

answered Aug 5, 2020 at 22:53

3 votes

Accepted

Spinor indices in $\not p = m_P$ (mass renormalization)

answered Jul 24, 2020 at 2:42

3 votes

Accepted

What's the debate about Newton's bucket argument?

answered Jun 3, 2020 at 3:07

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107 Answers

Hypothetically, why can't we wrap copper wires around car axles and turn them into electromagnets to help charge the batteries?

How do I interpret uncertainty in velocity greater than the speed of light?

Does perfect knowledge of momentum of a free particle imply that there is a finite probability of finding free particle anywhere in the universe?

How $[x,p]=i \hbar$ implies that $x$ and $p$ do not have simultaneous eigenstates?

Lagrangian potential for Newtonian gravity

Thought experiment with particle in a 1d potential well

LSZ reduction formula (Schwartz)

Why does a body accelerate when there is a force applied to it?

Is there a classical quantum mechanics?

What is the relationship between lattice field theory and grid-based numerical methods?

An integral in Peskin & Schroeder's Quantum Field Theory p. 27

What does $V(r)$ mean in the Schrodinger equation?

Does $L\cdot S$ commute with $J^2$?

Infinitesimal generator of change of basis (Fock Space)

Why is curved space able to change an object's velocity (vector)?

What is the source of light in Cherenkov radiation?

Three integrals in Peskin's Textbook

Why do the counterterms in renormalized $\phi^4$-theory with power two in fields give vertices and not propagators?

What makes the electron, as an excitation in a field, discrete?

Understanding Quantum Spin as a Vector And Spin Operators

What happens if we suddenly change the potential in Schrodinger equation?

Why does the time translation operator have a different sign than the time evolution operator?

$S$-matrix from LSZ

Why are only positive frequency mode functions allowed in Quantum field theory? How is this consistent with anti particles having negative energy?

Lorentz group generators and its dimensionality

Magnet Field and Electric field representation image misunderstanding

How to derive the formula for the quantum Hamiltonian $\hat H(\hat P,\hat Q)$ in terms of the classical $H(q,p)$, via Weyl Ordering?

If a photon takes all possible paths, does it travel faster than light?

Spinor indices in $\not p = m_P$ (mass renormalization)

What's the debate about Newton's bucket argument?