1,112 reputation
1317
bio website sites.google.com/site/…
location Singapore
age 24
visits member for 2 years, 7 months
seen 11 mins ago

Bachelor degree in Physics. Interested in mathematical aspect of quantum field theory(though ironically not mathematically enlightened, but in continuous training). Getting to know some basics of topological insulators. I will probably start pursuing a Phd in theoretical physics in 2014 or 2015.

I'm spending more time on www.physicsoverflow.org


Jul
13
comment Free Particle Path Integral Matsubara Frequency
The other thing is, I think, interpreting $\prod_{n\in\mathbb{N}} \frac{T}{4\pi n^2}$ as $\lim_{N\to\infty}\prod_{n=1}^N \frac{T}{4\pi n^2}$ is already a regularization, i.e. lattice regularization, $\omega_n=\frac{2\pi n}{\beta}, n=0, \pm 1, \pm2,\ldots\pm \frac{N}{2}$, where $N=\frac{\beta}{\epsilon}$, and in such regularization $Z$ literally equals $\lim_{N\to\infty}\prod_{n=1}^N \frac{T}{4\pi n^2}=0$
Jul
13
comment Free Particle Path Integral Matsubara Frequency
emm, this won't address op's question in the comment: if $\prod_{n\in\mathbb{N}} \frac{T}{4\pi n^2}$ is already convergent(to 0), why do we still need to regularize?
Jul
2
awarded  Curious
Jun
27
awarded  Promoter
Jun
27
comment When can we take the Brillouin zone to be a sphere?
@Heidar: I plead you not to forsake this quetion :)
Jun
23
revised Topological insulators: why K-theory classification rather than homotopy classification?
added 412 characters in body
Jun
4
awarded  Popular Question
Jun
3
revised When can we take the Brillouin zone to be a sphere?
added 412 characters in body
May
28
revised When can we take the Brillouin zone to be a sphere?
added 617 characters in body
May
24
awarded  Popular Question
May
12
revised When can we take the Brillouin zone to be a sphere?
added 12 characters in body
May
12
comment When can we take the Brillouin zone to be a sphere?
Hi @Heidar, this @ is just in case you forgot, and if you are still busy please take your time.
May
12
comment A question about causality and Quantum Field Theory from improper Lorentz transformation
I think so. Another example is vector versus pseudovector, they transform in the same way under rotation, but different under parity.
May
11
comment A question about causality and Quantum Field Theory from improper Lorentz transformation
it should go the other way: we have the physical definition of $p$, and knows how it ought to transform under time reversal, and then we write down the time reversal matrix for p, i.e. $\Lambda=diag(1,-1,-1,-1)$. There's nothing wrong to have a transformation matrix for $p$ different from that of $x$.
May
11
comment A question about causality and Quantum Field Theory from improper Lorentz transformation
$p\cdot(x-y)$ is invariant under parity, but isn't invariant under time reversal. Under time reversal, for $p$ the spatial components are reversed, for $x$ and $y$ the temporal component is reversed.
May
9
comment When can we take the Brillouin zone to be a sphere?
@Heidar: thanks in advance!
May
7
comment When can we take the Brillouin zone to be a sphere?
@Inmaurer: Yes, I am also more inclined to option (2)
May
7
comment Topological insulators: why K-theory classification rather than homotopy classification?
Dear Heidar, I've rewritten my above question in the comment into a question, I'd appreciate it if you can take a look:physics.stackexchange.com/questions/111440/…
May
6
revised When can we take the Brillouin zone to be a sphere?
deleted 1 character in body
May
6
asked When can we take the Brillouin zone to be a sphere?