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132 Answers

Votes Activity Newest
14
What is $U(1)$ symmetry?
May 7 '19 at 13:32
9
How do the operators act on a ket/bra?
Feb 2 at 17:04
9
Why is the Pauli exclusion principle not considered a sixth force of nature?
Dec 28 '20 at 13:21
4
Determinant of differential operator $( \partial^2 + m^2)$
Jan 6 at 12:09
4
Why reflection is generator of Minkowski space, if we know that only CPT symmetry is true?
Nov 16 '20 at 22:28
4
What will be the “Einstein field equations” for two or three bodies?
Jul 17 '20 at 7:09
4
Validity of weak gravitational field approximation (Schutz's First course in GR)
Jun 23 '20 at 13:25
4
Difference between physicist's vector and mathematician's vector
May 17 '18 at 10:20
4
How can the spacetime interval be negative?
Jun 20 '19 at 8:32
4
Path of a ray of light in curved Universe
May 30 '18 at 17:06
4
What is square of momentum operator $\hat{P}$ in two dimensions?
May 7 '18 at 13:44
3
Mathematical description of spin 0 state
Feb 11 at 7:48
3
Why do we define acceleration as $\nabla_{v_X}v_X$?
Sep 2 '20 at 13:51
3
Can we solve the general eigenfunction of $L_x$?
Jul 24 '20 at 17:09
3
What did I do wrong? I got $\nabla\cdot \vec A \neq div \vec A $
May 5 '20 at 8:19
3
Why do we take the wave function to be zero at the edges of the box when solving the Schrödinger Equation for particle in a box?
Apr 30 '20 at 8:14
3
I am stuck in the derivation of Schwinger-Dyson equation for 1-point Function in Schwartz's QFT book
Apr 29 '20 at 9:42
3
About the Yang-Mills equation
Apr 23 '20 at 10:04
3
Metric elements of the Schwarzchild metric
Dec 16 '19 at 15:53
3
From second quantization to first quantized Hamiltonian
Aug 27 '19 at 9:29
3
Calculation of current from path integral
Mar 21 '19 at 8:59
3
Identification of Spacelike hypersurfaces as diffeomorphisms
Jun 11 '18 at 10:05
3
Orthonormality of displacement operators
May 24 '18 at 9:11
3
Recession velocity, redshift and different cosmological models?
May 15 '18 at 15:47
3
Is Heat Death the only inevitable end?
May 14 '18 at 13:50
3
How to find unitary matrices?
May 14 '18 at 12:36
3
What does it mean by $h_{\mu\nu}$ having “gauge symmetry”?
May 1 '18 at 13:52
2
In thermodynamic limit, how is $\frac{V}{(2 \pi)^{3}} \int \mathrm{d}^{3} k= \int \frac{\mathrm{d}^{3} r \mathrm{~d}^{3} \boldsymbol{P}}{h^{3}}$?
Apr 2 at 12:48
2
Why is the Lie algebra of the unitary group generated by matrix units?
Mar 18 at 21:15
2
Noether's Theorem: There are conserved quantities corresponding to symmetries of position, orientation, and time, but why not velocity?
Mar 15 at 17:13
1
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