2,374 reputation
11232
bio website berkeley.academia.edu/…
location Berkeley, CA
age 24
visits member for 3 years, 7 months
seen 7 hours ago

Currently a graduate student in mathematics at the University of California - Berkeley.

Previously obtained a MASt. in Applied Mathematics from the University of Cambridge (2013), and a B.S. in Mathematics and a B.A. in Physics from the University of Chicago (2012).


Jun
11
revised The relation between classical and quantum vacua
added 36 characters in body
Jun
11
revised The relation between classical and quantum vacua
added 36 characters in body
Jun
10
asked The relation between classical and quantum vacua
May
3
awarded  Yearling
Apr
13
awarded  Notable Question
Mar
7
awarded  Popular Question
Mar
7
asked $\mathcal{N}=2$ spin $1/2$ supermultiplet
Feb
26
comment Unitary representations of the diffeomorphism group in curved spacetime
If this is the case, then I feel we should apply the Faddeev-Popov trick to the Einstein Hilbert action so as to find the corresponding BRST charge associated with this diffeomorphism symmetry, and perform the usual cohomological construction to find the space of states. Has this not been done before? What is the result?
Feb
26
revised Unitary representations of the diffeomorphism group in curved spacetime
added 131 characters in body
Feb
26
asked Unitary representations of the diffeomorphism group in curved spacetime
Feb
20
awarded  Good Question
Feb
14
awarded  Popular Question
Jan
31
awarded  Nice Question
Jan
24
awarded  Revival
Dec
4
asked Feynman rule for deriative interaction: an example
Nov
30
revised How do I find constraints on the Nambu-Goto Action?
added 1 characters in body
Nov
19
comment Amplitudes in renormalized perturbation theory
@Neuneck Yes, but I thought the point is that the total result should be proportional to $\lambda ^2$, not just $\lambda$.
Nov
19
comment Amplitudes in renormalized perturbation theory
@Neuneck I don't understand. The Feynman rule corresponding to the $4$-point counterterm vertex is just $-\mathrm{i}\, \delta _\lambda$, not $-\mathrm{i}\, \delta _\lambda \lambda$ or anything like this, so this entire counterterm diagram should just be of order $\lambda$. What am I missing?
Nov
16
comment Amplitudes in renormalized perturbation theory
This was more or less what I was expecting, but when I went to check this myself, I didn't see how $\delta _\lambda$ was of order $\lambda ^2$. Indeed, according to Peskin and Schroeder's Eq. (10.17) on pg. 324, $\delta _\lambda =\lambda _0Z^2-\lambda$, which is just of order $\lambda$ . . . or am I missing something?
Nov
16
accepted Charge-conjugation of Weyl spinors