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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 42,482
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 42,139
So i am working on a question, which is beyond my knowledge of Lorentz transformations and some help is greatly...
Apr8-14 06:33 AM
19 729
I'm currently going through my courses notes for relativity. We looked at Einsteins two postulates and then said that...
Apr7-14 08:36 PM
4 315
Hi guys, I was thinking about the relativistic effects a little bit, and I have a question regarding relative...
Apr7-14 07:00 PM
Andrew Mason
19 758
Sorry if this turns out to be a colossally stupid question. I'm a newbie. But since light has a constant speed in...
Apr7-14 05:42 PM
2 289
consider a circular loop (a particle accelator). Suppose any particle moves their with speed ≈ c. Now let the radius...
Apr7-14 07:40 AM
3 423
Hey all, I've been reading my fair share on physics and I would like to find a solution to a question that has been...
Apr6-14 07:42 AM
11 429
Trying to see the logic in deriving length contraction and time dilation using the Lorentz transformations and inverse...
Apr5-14 02:15 PM
43 1,730
What is the simplest derivation of the transformation rules for Maxwell's equations in special relativity? I'm...
Apr5-14 02:14 AM
17 2,123
Hello again, Two days ago, I started a thread asking about the same question more or less, and I was thinking that...
Apr4-14 11:26 PM
2 329
How can I explain to someone who has only high school level of education in physics, what is general and special...
Apr4-14 11:13 PM
29 1,245
I have a question pertaining to objects falling through the event horizon of a black hole. It is my understanding...
Apr4-14 05:07 PM
3 367
I understand how contravariant 4-vectors transform under a Lorentz transformation, that is: ##x'^μ=...
Apr4-14 07:03 AM
23 968
... Three scientists are familiar with Special Relativity and it's rules. The three scientists decide to conduct...
Apr4-14 03:41 AM
Doc Al
11 757
Hi friends, I was wondering about the following - in GR texts we always see these penrose diagrams and some line...
Apr3-14 05:20 PM
6 444
In popular perception of curved spacetime the metaphor of trampoline and a dimple on it is often used to explain...
Apr3-14 01:57 PM
20 1,109
Hi guys. I was reading a paper in which a calculation was done to show that in Schwarzschild space-time, if we...
Apr3-14 08:27 AM
41 2,650
Hello to everybody, the question seems trivial in my mind, yet, is it legal to say that there is not unique frame...
Apr2-14 06:02 PM
4 421
Hi all. we know that the rest is the mass of an object within a coordinate system which has zero velocity, but how...
Apr2-14 04:59 PM
2 307
I am a little confused about the Galilean transforms. If I have t'=\gammat Is t ALWAYS the frame of reference...
Apr2-14 09:05 AM
6 464
I was hoping someone could help me with a simple physics question I've been mulling over, I've failed to find an...
Apr2-14 06:07 AM
12 750
Hello All, Sorry if my question seems to be elementary. I am trying to find out a little bit details of the Riemann...
Apr2-14 01:13 AM
3 400
Hi everybody, As you know, the Einstein field equation R_{μ\nu} - 1/2Rg_{μ\nu} =κT_{μ\nu} implies that at...
Apr1-14 11:31 PM
10 623
Hello, I have a question, whether is possible to looking for Killing Vectors (KV) in this way (I know about...
Apr1-14 07:26 PM
4 477
Hi, I've heard and read that if someone was to fall towards a black hole, say feet first, they would undergo...
Apr1-14 06:23 PM
7 585
I'm trying to work out: (∇f)^2 (f is just some function, its not really important) While working in curved...
Apr1-14 05:02 AM
7 382
Hi, I've found geodesic equations for the metric: \begin{equation} ds^{2} = -c^{2} \alpha dt^{2} + \frac{1}{...
Mar31-14 10:35 AM
1 358
In an expanding universe that is modeled by the FRW metric we assume that scale factor of the "present epoch" is unity...
Mar30-14 01:33 PM
4 402
Hi All. Layman question. In the twin's paradox, why one of the brothers is older when they meet again?. if movement...
Mar30-14 05:05 AM
63 6,178
In Padmanabhan's Theoretical Astrophysics by defining a ratio for comparing gravitational potential energy with...
Mar29-14 07:58 PM
9 580
Ok, I have an experiment, well actually it is more of a question than an experiment. I have a very elementary...
Mar29-14 04:09 PM
15 737
I couldn't work out exactly where to post this. I've heard several times that QM and General relativity "contradict"...
Mar29-14 11:22 AM
2 414
So basically, my physics class has begun focusing on SR. And i just wanted to clarify something. I have been...
Mar29-14 02:44 AM
6 511
v=? delta what/which X(distance) over delta what/which T(time)
Mar28-14 10:02 PM
21 1,396
Hello, Im a newguy here, so if my question dont belong to this section, please let me know. My question: In...
Mar28-14 08:21 PM
5 482
Hello, Im looking for some time dependent exact solution of Einsteins eqs. If Im right (if not please correct me)...
Mar28-14 02:52 PM
6 425
I know the reasons why the relativistic mass equation (M= gamma Mo) is out of favour with what seems to be a majority...
Mar27-14 12:58 PM
37 1,917
Can a magnetic field bend space-time?
Mar27-14 01:34 AM
1 400
So the angular diameter distance is given by the angle it extends in the sky and its actual size x d_A=...
Mar26-14 02:38 PM
0 336
In an old (2008) thread, DrGreg posted this transformation from a Minkowski chart to a Rindler chart ...
Mar26-14 02:24 PM
16 621
So I have just been introduced to indices, four vectors and tensors in SR and I'm having trouble knowing exactly what...
Mar26-14 10:24 AM
5 417

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