26,843 reputation
458102
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location Princeton, NJ
age 25
visits member for 2 years, 10 months
seen 20 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.


17h
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.
1d
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.
2d
answered Confusion about two forms of connection coefficients
2d
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.
2d
revised Confusion about two forms of connection coefficients
latex
2d
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
May
21
reviewed Leave Open What are the parity of particles?
May
21
reviewed Close Elasticity-Calculating the speed of particle attatched to string
May
21
comment Number of significant figures
Nitpick: In a digital instrument where there is no doubt the displayed digits are correct, the discretization error is $1/\sqrt{12}$ times the scale step, not $1/2$, if you're going for the standard deviation.