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Special & General Relativity

- Dependence of various physical phenomena on relative motion of the observer and the observed objects. Exp. & theo. theories of relativity
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Common Relativity questions, quality answers
Jul24-14 09:06 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
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I am doing a research about the compact Milne Universe in two dimensions Using special relativity. such that (t,θ)...
Aug28-13 08:35 AM
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Definition of Large-Scale Isotropy and Homogeneity This post is part of my attempt to develop a formal definition...
Aug23-14 11:23 PM
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Consequences of Energy conservation in a FLRW spacetime This entry uses the local energy conservation law to derive...
Aug23-14 10:39 PM
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Corrections to Narlikar paper The paper by Jayant N Narlikar ’Spectral shifts in General Relativity’ in the...
Aug23-14 11:04 PM
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Einstein tensor in the FLRW frame - Part 1 of 2 This note develops a formula for the ##G^{00}## component of the...
Aug23-14 10:48 PM
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A quick question. It's been a long time since I had anything to do with special relativity, so I really can't...
Y 01:45 PM
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Equations of state for photon gas and relativistic electron gas This entry develops equations of state that are...
Aug23-14 11:28 PM
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I've been reading Kip Thorne's "Black Holes and Time Warps," and it mentioned something rather counter-intuitive;...
Y 06:16 PM
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The Lorentz's transform: ##x' = k(x - vt), t' = k(t - vx)\ k = \gamma,\ and\ c = 1## I. The speed composition...
Y 10:15 PM
3 120
I know that you're going to probably say that a frame of reference doesn't make sense for light, but I've uploaded a...
Feb5-13 09:38 PM
4 124
Is it possible to find the parametric representation X= x(y^{a}) of a surface given the components of the metric...
Sep16-14 03:24 PM
0 124
In this paper: the authors claim to show that linearity of the lorentz...
Sep17-14 08:07 AM
center o bass
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Is there gravity between two photons?
Y 03:49 PM
3 145
For another BRS thread, I looked up some information at and was completely sidetracked...
Mar1-10 05:00 PM
Chris Hillman
2 146
Although I can't nominate myself for a Nobel Prize, I was wondering I any distinguished scientist would oppose such a...
Feb12-13 02:55 AM
4 156
Draft re Ricci vs Riemann tensors This one is really just the beginning of a musing. I can't even remember if I...
Aug28-14 02:54 AM
Markus Hanke
1 161
I have some problems verifying a particular equation in the Cartan formalism of GR. Basically I want to prove the...
Sep8-14 12:07 PM
0 161
A train (source) approaching a stationery observer, wavelength of the sound is equal to the distance between source...
Sep14-14 12:24 PM
2 161
The Friedmann equation states that $$(\frac{\dot a}{a}) = \frac{8\pi G}{3} \dot \rho + \frac{1}3 \Lambda -...
Sep16-14 04:18 PM
5 167
According to SR, there is no measurement that can determine whether an object is stationary or under motion. So if two...
Sep16-14 11:19 AM
4 174
Blog entry by Bill_K The Absolute Derivative In relativity we typically deal with two types of quantities -...
Sep2-14 11:00 PM
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I'll try rephrasing my question, as I do not wish to question the theory itself. Verily, verily, it would be...
Feb16-13 04:19 PM
4 176
I've been starting to look at the Hilbert action derivation of Einstein's equations, and have an introductory...
Sep14-14 12:34 PM
1 182
Apriori -- before taking any of the postulates of special relativity into account -- we might say that the lorentz...
Y 02:53 PM
center o bass
4 183
I just recently derived the metric tensor of the 4-sphere by embedding the coordinate system within 5D spherical...
Sep15-14 03:30 AM
5 186
We know how objects such as the metric tensor and the Cristoffel symbol have symmetry to them (which is why g12 = g21...
Sep2-14 08:04 PM
1 188
One argument against Mach's principle is the speed of light restriction. How could the distant cosmic mass of the...
Y 02:37 PM
10 189
So let's say we have a neutron star. A neutron star is very massive and very dense therefore it has a very strong...
Sep17-14 06:49 PM
5 190
This expression: \Gammaavc\Gammacab Can someone please show me how to multiply the two Christoffel symbol...
Aug14-14 12:45 PM
1 190
Blog Entry by Bill_K A spacetime is often described in terms of a tetrad field, that is, by giving a set of basis...
Sep2-14 11:01 PM
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How can speed of light be absolute yet that fact and relativity of sublight speed implies relativity of space and time...
Sep17-14 10:42 AM
2 196
I am trying to expand $$\varepsilon^{{abcd}} R_{{abcd}}$$ by using four identities of the Riemann curvature tensor: ...
Sep17-14 06:41 AM
5 198
Here's a weird question where I don't quite know if length contraction or time dilation play a role. Say I have 2...
Sep7-14 03:44 PM
1 205
In this source explaining how to derive the Schwarzchild metric, the person came up with an ansatz and worked from...
Aug21-14 08:31 AM
1 208
I’ve just read Schutz: “Gravitation from ground up”. He says that there are 4 (not all independent) sources of...
Sep12-14 08:09 AM
1 215
Alright, I'm rather new to General Relativity, and I'm getting confused with four momentum. Back in SR, p^α=mU^α, but,...
Sep15-14 08:55 PM
2 217
Dear all, I was reading this...
Aug9-14 03:04 PM
2 218
In my recent studies of curvature, I worked with the Riemann tensor and the equation: (\deltaV)a=...
Sep9-14 06:02 PM
2 227
When you have a general coordinate chart on spacetime you have a lot of freedom to pick your coordinates, but you are...
Aug12-14 07:03 PM
1 228
when muons are created in the atmosphere and fall to earth the earth clock runs faster. Thus, the "slower" muon clock...
Aug4-14 10:08 PM
2 233

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