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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
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 42,756
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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I am trying to expand $$\varepsilon^{{abcd}} R_{{abcd}}$$ by using four identities of the Riemann curvature tensor: ...
T 06:08 AM
2 140
It is my understanding (perhaps I am wrong) that relativity implies that all frames of reference are equal. For...
T 06:06 AM
5 142
Consider the following case: First frame S, which is earth. Second frame S', which is rest relative to rocket....
T 05:49 AM
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a metric is also used to raise/lower indices. g_{\nu \mu } x^{\mu} = x_{\nu} g^{ \nu \mu} x_{\mu} = x^{\mu} ...
T 05:07 AM
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Hi all, this is a follow-up variant to an earlier post ...
T 05:03 AM
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I am attempting to read my first book in QFT, and got stuck. A Lorentz transformation that preserves the Minkowski...
T 04:32 AM
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I have always been confused about time dilation in General Relativity. In the twins paradox, it is the traveling...
Y 08:05 PM
3 154
The Friedmann equation states that $$(\frac{\dot a}{a}) = \frac{8\pi G}{3} \dot \rho + \frac{1}3 \Lambda -...
Y 04:18 PM
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Is it possible to find the parametric representation X= x(y^{a}) of a surface given the components of the metric...
Y 03:24 PM
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SR directly addresses only inertial frames. Can SR be applied to analyze accelerated frames? For example, consider...
Y 12:30 PM
12 285
A simple experiment can be build to demonstrate a possible contradiction between thinking theory and reality. Use...
Y 11:56 AM
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According to SR, there is no measurement that can determine whether an object is stationary or under motion. So if two...
Y 11:19 AM
4 136
Can anyone answer this question? What you would see while watching a stationary clock that you are moving directly...
Sep15-14 11:52 PM
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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
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I recently watched a video in Einstein's train though experiment. From what...
Sep15-14 02:51 PM
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Hi, I have been reading about gravitational waves for the last few days. I saw any cylindrically or spherically...
Sep15-14 12:42 PM
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A person in the earth (stationery frame) observes the clock in the spaceship (which almost moving at the speed of...
Sep15-14 08:56 AM
sweet springs
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On the surface of a unit sphere two cars are on the equator moving north with velocity v. Their initial separation on...
Sep15-14 08:50 AM
11 446
I just recently derived the metric tensor of the 4-sphere by embedding the coordinate system within 5D spherical...
Sep15-14 03:30 AM
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As you may know, the metric tensor for 3D spherical coordinates is as follows: g11= 1 g22= r2 g33= r2sin2(θ) ...
Sep15-14 01:49 AM
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Rephrase from another thread I posted a while back; If you believe as masses increase in distance gravitational...
Sep14-14 11:08 PM
Simon Bridge
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I've been starting to look at the Hilbert action derivation of Einstein's equations, and have an introductory...
Sep14-14 12:34 PM
1 154
A train (source) approaching a stationery observer, wavelength of the sound is equal to the distance between source...
Sep14-14 12:24 PM
2 132
While reading Special Theory of Relativity from Feynman Lectures, I fell into the confusion about invariant speed of...
Sep14-14 09:31 AM
7 300
If I understand everything correctly, space near (but outside) a mass is curved negatively, so that if I create a...
Sep14-14 07:06 AM
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This has come up in enough threads now that I feel the need to give my take on it in a convenient central location, so...
Sep14-14 04:41 AM
21 1,088
Why does light bend due to gravity? I thought hard, read a lot and I found 3 reasons I can give as the answer. But...
Sep13-14 09:26 PM
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Pardon my elementary questions, but: Why is it that photons can only travel at the speed of light? I know because...
Sep13-14 05:33 PM
7 238
I am not sure whether this is a 'relativity' query as it may not be concerned with the order of events nor...
Sep13-14 11:37 AM
32 617
I thought others might be interested in an old educational paper and fim demonstrating that you can't accelerate...
Sep13-14 02:32 AM
4 295
I wanna prove the invariance of the Klein-Gordon Lagrangian \mathcal{L}=\frac 1 2 \partial^\mu \phi \partial_\mu...
Sep12-14 06:43 PM
7 284 We’ve all seen this little fellas up there. Two brothers, twins, in their 60’s....
Sep12-14 02:22 PM
4 477
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
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For a long time I have studied and read about whether the photon has mass. On this forum, I could find a link to a...
Sep12-14 06:39 AM
36 936
After my recent studies of the curvature of the 2- sphere, I would like to move on to Minkowski space. However, I can...
Sep12-14 06:27 AM
10 412
According to a quote from a past Physics Forums article, 4D spacetime can be embedded isometrically (preserving the...
Sep11-14 10:08 PM
4 279
Does anyone know why we are looking for dark mater - instead of say, modifying our laws of gravity to conform with...
Sep11-14 06:08 PM
6 283
Thought experiment: Alice, Bob, and the planet Zolan. Alice is floating in space 10 light seconds from the planet...
Sep11-14 02:44 AM
6 516
Objects in motion relative to an inertial frame S are measured to have contracted lengths in S in the direction of...
Sep10-14 11:29 AM
18 642
Hi all. New to physics forum and glad to be here. I have been referencing the site for a while now and have finally...
Sep10-14 04:40 AM
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