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18m
answered LIGO discovery: what in the paradigm hierarchy is that that is not wibbling?
24m
comment How is it that distortions in space can be measured as distances?
@JoeBlow: I've extended my answer to address your and related comments. Light is stretched by changes in the metric, but in the LIGO experiment the timescale for this is much slower than new unstretched light is shone into the arms.
25m
revised How is it that distortions in space can be measured as distances?
Extend answer
35m
answered Is there any issue/concern for a slight wavelength shift of the laser light in the LIGO experiments?
1h
comment Light from the big bang
And the universe doesn't have a centre
1h
comment Light from the big bang
The Big Bang didn't happen at a point
3h
revised Electromagnetic Wave Propagation
edited tags
3h
comment Electromagnetic Wave Propagation
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
3h
comment How to add my URL to StackExchange?
Hi Mitesh, click the flag link and ask a moderator to move your question to the Meta.
4h
answered Schwarzschild manifold
5h
comment Is the cosmological time grosso modo isochrone?
igael, are you asking whether any regions of the universe differ significantly from the comoving frame? That is, are there regions of the universe with significant peculiar velocities?
5h
comment Exercise 18b in Schutz's First course in GR
@MathematicalPhysicist: Oh I see, you're arguing that any null vector normal to $A$ must be zero. I would say instead that to be normal to $A$ any (non-zero) vector $B$ must have the form $(0, b_1, b_2, b_3)$ and therefore must be spacelike not null. But either approach is fine.
6h
comment Exercise 18b in Schutz's First course in GR
@MathematicalPhysicist: typo? Did you mean $\vec{B}^2 \gt 0$ i.e. $\vec{B}$ is spacelike not null?
6h
comment Is the cosmological time grosso modo isochrone?
I don't understand what you mean by grosso modo isochrone and googling doesn't help. Can you clarify what you are asking?
6h
answered Exercise 18b in Schutz's First course in GR
6h
awarded  Guru
18h
comment Spring constant and a spring's decompressed length
Related and possibly a duplicate: Does the stretching of a spring depend on its rest length?
18h
answered General Relativity, Curvature, and extra dimensions
19h
revised According to Ohm's Law, shouldn't there be a zero electric potential within a capacitor since the current is 0?
Tweak
19h
revised How can I calculate how high an arrow goes when all I know is its initial speed?
I'm not taking my clothes off in the name of physics