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1627
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location Cambridge, MA
age 26
visits member for 2 years, 8 months
seen 2 hours ago

Physics Graduate student at Harvard University.


5h
reviewed Close Soft Scalar Emission
10h
comment Proving a relation for representations of gauge groups
@Qmechanic - OK. thanks for notifying me. Will follow this next time.
1d
revised Proving a relation for representations of gauge groups
deleted 158 characters in body
1d
asked Proving a relation for representations of gauge groups
1d
reviewed Close Search materials by HOMO, LUMO and work function
1d
reviewed Close The Big Bang theory
2d
reviewed Close Critical engine failure just after rotation: what percent of accelerated slipstream lift does the wing loose?
Dec
16
comment Confusion about the Kronecker delta symbol
@Qmechanic - I suggest you write out an explicit example maybe for $n=3$ or $n=4$.
Dec
15
comment Getting the electric field using Green's function
You do not need to set x0 = y0. The integral can be computed easily. Use contour integrals for the time part.
Dec
15
comment Getting the electric field using Green's function
$k^2 \neq (k^0)^2 |\vec{k}|^2$, but $k^2 = (k^0)^2 - |\vec{k}|^2$.
Dec
15
comment Getting the electric field using Green's function
Have actually tried just working it out?
Dec
13
reviewed Close How to find the magnetic field around a wire with the full time dependent Maxwell Equations?
Dec
12
comment How to get second order equation for spinor (derivation from Dirac equation)?
I write $\gamma^\mu \gamma^\nu = \frac{1}{2} \{ \gamma^\mu , \gamma^\nu \} + \frac{1}{2} [ \gamma^\mu , \gamma^\nu ]$. For the first part, I use the Clifford algebra. The second part is contracted with $D_\mu D_\nu$. However, since $\frac{1}{2} [ \gamma^\mu , \gamma^\nu ]$ is anti-symmetric, I can replace $D_\mu D_\nu$ with $\frac{1}{2} [ D_\mu , D_\nu ]$.
Dec
12
answered How to get second order equation for spinor (derivation from Dirac equation)?
Dec
12
comment How to get second order equation for spinor (derivation from Dirac equation)?
Act on the first equation with $\gamma^\nu D_\nu + m$
Dec
10
comment Numerically solving 2D poisson equation by FFT, proper units
I understood v1 of your question to mean how you obtain the second equation and if you had gotten all the factors of $2\pi$ and what not correct. If that was not what you wanted, then disregard this answer.
Dec
9
revised Axial symmetry constraints on the metric
added 137 characters in body
Dec
9
reviewed Close I wnt to know HOW to create TM, TE, and TEM waves; and is it being used in industry?
Dec
9
reviewed Close Does the orientation matter by a heat mirror?
Dec
9
comment Does constant velocity of center of mass imply linear momentum is conserved?
Assuming that the system does not lose mass, yes.