26,862 reputation
458102
bio website
location Princeton, NJ
age 25
visits member for 2 years, 10 months
seen 12 mins ago

I am a graduate student studying astrophysics at Princeton. I received my bachelor's in physics and mathematics from Caltech (2011).

My primary interest is in general relativistic magnetohydrodynamics simulations of black hole accretion.


12m
comment FFT in audio spectrogram: amplitudes are shown, where are the phases?
This seems off-topic as it is asking about the design decisions of software. We cannot answer why they choose not to display phase information.
2h
answered Boltzmann equation in cosmology
11h
comment Perfect fluid and Cauchy momentum equation
I'm pretty sure $\nabla_\mu(\rho u^\mu) = 0$ is the correct continuity equation. It holds in arbitrary spacetimes for any perfect fluid with conserved rest mass density $\rho$.
1d
comment Confusion about two forms of connection coefficients
While you could use the same dummy index in multiple locations (e.g. $g_{\alpha\beta} g^{\beta\gamma} + \Gamma_{\alpha\beta}^\gamma X^\beta$), this is a bit risky, and might lead to mistakes later on.
2d
comment Confusion about two forms of connection coefficients
Yes, you can always replace all occurrences of an index with another one that is not already in use.
May
23
answered Confusion about two forms of connection coefficients
May
23
comment Confusion about two forms of connection coefficients
Hi Sayan Datta, and welcome to Physics Stackexchange! Note that we support LaTeX-style MathJax for math formatting. You can click "edit" to see how I formatted your equations if you're not familiar with the syntax.
May
23
revised Confusion about two forms of connection coefficients
latex
May
22
comment What happens to the skin when UV light burn you at the beach?
UV light is energetic enough to break chemical bonds (a topic better suited for chemistry than physics), and the response of your skin is very much a question for biology, not physics.
May
22
comment What speeds are “fast” enough for one to need the relativistic velocity addition formula?
I've heard the centimeter-level precision claim too, though I can't fathom how they deal with the varying light travel time though a dynamical atmosphere to the point where GR becomes relevant.
May
21
reviewed Leave Open How can we calculate the standard deviation of multiple values with different uncertainties each?
May
21
reviewed Close Why does a circle of light form around a wire when a laser is pointed at it?
May
21
reviewed Close Doping a Semiconductor with Acceptors
May
21
reviewed Close Potential (which only depends on the length of a position vector)
May
21
reviewed Close Mechanical energy?
May
21
reviewed Close How to quantize Dirac field?
May
21
reviewed Leave Open Operational difference between separable, entangled, PPT and NPT states
May
21
reviewed Close Changing variables in a Lagrangian to obtain mass terms of gauge fields
May
21
reviewed Close Does Time change over temperature?
May
21
reviewed Close About the non-physicallity of the scalar derivatives of potentials in Lorenz qauge and longitudinal EM waves