2,106 reputation
11031
bio website berkeley.academia.edu/…
location Berkeley, CA
age 24
visits member for 3 years, 6 months
seen Oct 21 at 19:10

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).


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
Nov
16
revised Charge-conjugation of Weyl spinors
edited body
Nov
16
revised Amplitudes in renormalized perturbation theory
edited title
Nov
16
asked Charge-conjugation of Weyl spinors
Nov
16
asked Amplitudes in renormalized perturbation theory
Nov
16
revised Pre-gauge-fixed superspace action of the RNS superstring
deleted 3 characters in body
Nov
16
asked Pre-gauge-fixed superspace action of the RNS superstring
Oct
24
revised Renormalizability of the Polyakov Action
added 1 characters in body
Oct
24
revised Renormalizability of the Polyakov Action
added 13 characters in body
Oct
24
accepted Renormalizability of the Polyakov Action
Oct
24
answered Renormalizability of the Polyakov Action
Oct
22
answered How does one get these definitions of the energy momentum tensor?
Oct
5
comment Is the Lorentz group compact (and if not, is U(1)?)
I also think it is mis-leading to only say that Lorentz boosts are parametrized by $v\in (-c,c)$. They are, but you mustn't forget that the group law is not simply addition in $\mathbb{R}$; instead, it is given by the usual velocity addition formula in special relativity. It turns out that this group law makes $(-c,c)$ into a Lie group which is isomorphic (as Lie groups) to $(\mathbb{R},+)$ via $\mathrm{arctanh}$.