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seen Jun 10 at 4:53

Nov
17
revised Time Dilation Experiment
added 190 characters in body
Nov
17
answered Time Dilation Experiment
Nov
17
comment Time Dilation Experiment
It would help if you described what you meant by "nullify" the effects of time dilation. Relative to a stationary observer at infinity, both gravitational and velocity-related effects work to slow clocks, so there is never any sense in which they cancel each other. Or did you mean relative to a stationary observer on Earth? The latter is do-able. I'll post how below.
Nov
17
answered The virtual particles are only a fictive tool in equations? DO they exist or DON'T? And if they exist, why do we call them VIRTUAL?
Oct
23
comment Having trouble understanding some stuff about delta functions
Haha, you beat me.
Oct
23
answered Having trouble understanding some stuff about delta functions
Oct
13
answered Transformation to a uniformly rotating frame
Oct
13
comment What is $V^\mu$ if $\nabla_{\mu} V^{\mu}$=scalar?
I'm not sure what you mean. $V^\mu$ is a vector with components $V^0$, $V^1$, $V^2$, $V^3$.
Oct
11
comment Special Relativity: Finding the Euler Lagrange of a massive particle
I don't understand this. You can certainly choose $\lambda = \tau$ if you want to.
Oct
11
comment Special Relativity: Finding the Euler Lagrange of a massive particle
Why keep the square root? Remember that if $L$ satisfies the E-L equation then $L'=f(L)$ will also satisfy them as long as your parameter $\lambda$ is affine. I suggest using $L'=L^2$ to get rid of the square root - it will make things much easier.
Oct
11
comment Geodesic equation from Euler - Lagrange
You can always change indices which are summed over because they are just dummy indices! And as long as your free indices match up, your equations should make sense.
Oct
11
answered What is the cause of gravitional force of attraction?
Oct
10
comment Why particle number operator $\hat{N}$ is $\hat{a}^\dagger\hat{a}$ rather than $\hat{a}\hat{a}^\dagger$?
I think he means that $a^\dagger a$ kills the vacuum while $a \, a^\dagger$ doesn't.
Sep
23
answered Special relativity; rocket moving towards a mirror
Sep
7
comment Gravity Concept Question
The sun can't just suddenly disappear. What you're asking us to do is use the laws of physics to describe a situation that violates the laws of physics.
Jun
12
answered What is the physical importance of current density?
May
8
comment Chasing a photon
@brightmagus This seems to have spurred an interesting discussion, but to reply to your original comment: I never claimed this was a proof. Velocity addition was originally derived from the assumption that c=const, so it had better work that way. Marco Prins asked whether or not a photons velocity would still be c if one were trying to chase it at high speeds, and what the equation to calculate such a scenario is. I provided him with what he asked for. Of course, you can't "prove" that c=const must be true simply via theory - this is something that must be confirmed by experiment.
May
6
awarded  Nice Answer
May
6
revised Chasing a photon
added 78 characters in body
May
6
answered Chasing a photon