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Jan
4
comment Explicit Variation of Gibbons-Hawking-York Boundary Term
To find the variation of $n_{\mu}$, use $n^{\mu} n_{\mu} = 1$ and the fact that $n_{\mu}$ is the normalized gradient of some scalar: $$n_{\mu} = \frac{\partial_{\mu} \phi}{\sqrt{g^{\alpha \beta} \partial_{\alpha} \phi \partial_{\beta}\phi}}. $$ You can find more details here: jacobi.luc.edu/Useful.html
Feb
6
awarded  Revival
Feb
6
answered Boundary term in Einstein-Hilbert action
Sep
24
awarded  Autobiographer
Aug
21
comment Vasiliev Higher Spin Theory and Supersymmetry
If this is the "Paul" that I think it is, hi and welcome to the site! If it's another Paul, I guess the same applies.
Jul
20
answered Evaluating the Einstein-Hilbert action
May
28
comment Tensor decomposition of $\partial_\mu A_\nu$
The symmetric, traceless part isn't gauge-invariant, so it shouldn't have the same sort of interpretation as the anti-symmetric part.
May
10
answered Using Ampere's Law for a Solenoid
May
9
answered Gauge symmetry for p-forms
Feb
2
awarded  Yearling
Nov
19
answered Symmetry transformation in AdS space
Nov
4
awarded  Nice Answer
Nov
1
answered How does the full string theory potential look?
Jun
30
comment What experiment would disprove string theory?
Downvote for not answering the question.
Apr
14
awarded  Quorum
Feb
2
awarded  Yearling
Jan
21
answered What exactly are we doing when we set $c=1$?
Nov
22
answered What does Friedrichs mean by “Myriotic fields”?
Nov
13
comment Cubic term in gauge theories
I'm not sure why you'd do that. Do you know of some way of building a sensible F^3 theory?
Nov
12
awarded  Commentator