User Alex Nelson - Physics Stack Exchange

Alex Nelson

Member for 11 years, 6 months
Last seen this week

GitHub
pqnelson.github.io/notebk
In front of my computer...

64 Answers

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17 votes

Accepted

In what sense is the renormalization group equation a group?

answered Mar 6, 2014 at 19:45

17 votes

What's wrong with the square root version of the Klein-Gordon equation?

answered Jan 2, 2015 at 4:51

16 votes

Accepted

Three integrals in Peskin's Textbook

answered Mar 25, 2014 at 14:02

14 votes

Is it true that the Schrödinger equation only applies to spin-1/2 particles?

answered Aug 6, 2014 at 13:40

12 votes

What are examples of Lagrangians that not of the form $T-U$?

answered Jan 13, 2013 at 4:45

10 votes

When is Lebesgue integration useful over Riemann integration in physics?

answered Oct 1, 2012 at 0:16

10 votes

Accepted

ADM Hamiltonian formalism and Quantum gravity

answered Aug 17, 2012 at 15:23

9 votes

Accepted

Wick Rotation in Curved space

answered Aug 19, 2014 at 4:30

8 votes

Accepted

Lorentz invariance of the 3 + 1 decomposition of spacetime

answered Jun 18, 2012 at 20:18

8 votes

Accepted

Request for Reference: BRST formalism/transformations

answered Jun 22, 2012 at 15:18

8 votes

Linear algebra for quantum physics

answered Oct 6, 2012 at 3:29

7 votes

In classical mechanics, are complex numbers unphysical?

answered Nov 23, 2012 at 22:33

6 votes

Accepted

Relation between Dirac's generalized Hamiltonian dynamics method and path integral method to deal with constraints

answered Jun 23, 2012 at 18:11

6 votes

Discretization of action in path integral

answered Apr 27, 2013 at 23:28

5 votes

Accepted

What experiment would disprove loop quantum gravity?

answered Jul 21, 2015 at 21:34

5 votes

Accepted

Is causality a total order?

answered Jan 2, 2016 at 16:06

5 votes

Why is there no gauge-invariant local operator in GR?

answered Sep 5, 2019 at 15:57

4 votes

Accepted

"Killing leaves" in General Relativity?

answered Feb 4, 2019 at 17:47

4 votes

Is it in general true that $\nabla_\mu T^{\mu\nu}=0$ implies the matter equations of motion?

answered Jan 16, 2015 at 5:35

4 votes

Accepted

A Conceptual Problem With the Field Equations of General Relativity

answered Sep 4, 2014 at 15:46

4 votes

Accepted

Ordering Ambiguity in Quantum Hamiltonian

answered Sep 30, 2012 at 4:30

3 votes

Accepted

The (co)algebra for the (co)monad of a light switch

answered Jun 18, 2012 at 19:30

3 votes

Accepted

Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$

answered Nov 30, 2012 at 16:42

3 votes

Canonical quantum gravity

answered Jan 12, 2014 at 19:44

3 votes

Resources on constrained Hamiltonian field theory

answered Feb 27, 2019 at 17:07

3 votes

Is there a "square root" version of the Einstein field equation?

answered Sep 22, 2017 at 13:41

3 votes

What is meant by a "c-number"?

answered Oct 11, 2015 at 2:53

3 votes

Accepted

Can the universe's topology change during its evolution?

answered Aug 30, 2021 at 17:33

3 votes

Charges in Terms of Lie algebra Root Decomposition

answered Jul 10 at 17:48

2 votes

Why is there no uncertainty principle for mass or charge?

answered Jun 26 at 20:33

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