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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
ZapperZ
1 41,486
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
jtbell
0 41,112
Einstein's article "on the electrodynamics of moving bodies", starts with talking about synchronizing clocks at...
Mar4-14 11:46 AM
WannabeNewton
7 381
I've been working on Ex 5.4 in MTW. The maths is fairly straight forward, but I don't really understand what is going...
Mar4-14 09:40 AM
TerryW
2 359
Hi all. I'm taking a course in GR and trying to get my intuition and mathematical techniques up to speed. I've been...
Mar3-14 03:42 PM
PAllen
6 438
In GR one of the fundamental postulates is that ##-ds^2 = - g_{\mu \nu} dx^\mu dx^\nu## is interpreted as a the time...
Mar3-14 10:27 AM
dauto
1 281
Hi folks! I'll start by admiting that I'm a cockroach compared to Einstein or Hawking, and I think that due to...
Mar3-14 10:24 AM
dauto
14 572
It seems that time dilation does not occur due to acceleration alone. It surprised me to learn this due to the...
Mar2-14 12:55 PM
PAllen
19 862
I know that the spacetime in special relativity is not curved and that the axis can be transformed via the lorentz...
Mar2-14 10:52 AM
Naty1
2 324
Hi, I have been pondering on this - what is the energy required to move a point mass m0 from a radial position...
Mar2-14 08:39 AM
Sunfire
11 563
Hey guys, I am working on a computer simulation of our solar system and basically analyzing the affects of the...
Mar1-14 04:18 PM
muzz
0 274
Suppose Alcubierre warp drives or some alternative form of warp drive is possible. Then surely a warp drive could...
Mar1-14 01:59 PM
PAllen
3 513
I was wondering how is our perception created according to relativity, since what we perceive depends on the...
Mar1-14 11:07 AM
Nugatory
7 579
Hello All, As far as the Newtonian mechanics and Einstein's GR is concerned, I am a little bit confused in the...
Mar1-14 09:44 AM
Naty1
55 2,578
When we write contravariant and covariant indices, for example for the Lorentz transformation, does it matter if we...
Mar1-14 04:06 AM
Fredrik
2 365
Hi. I'm curious about this: The supposed "warp drive" by Miguel Alcubierre is supposed to go faster than light....
Feb28-14 10:11 PM
UltrafastPED
2 359
In a Kerr Black Hole there exists a region called the Ergosphere. It is between the Event Horizon and a spheriod...
Feb28-14 02:25 PM
Philosophaie
2 315
I'm only an amateur enthusiast when it comes to physics and have no background in science at all. It's just something...
Feb28-14 11:17 AM
phyti
35 1,373
So I read the Wiki entry, and from what i gather ultrarelativitic speeds are speeds that almost the speed of light (I...
Feb28-14 09:31 AM
jtbell
8 397
Bit confused regarding how non-inertial frames can be treated in GR (and by non-inertial i mean affected by some kind...
Feb28-14 01:58 AM
WannabeNewton
1 288
I am trying to write the Einstein field equations $$R_{\mu\nu}-\frac{1}{2}g_{\mu\nu} R=\frac{8\pi G}{c^4}T_{\mu\nu}$$...
Feb27-14 10:56 PM
Nabigh R
2 467
There is a moving light clock at a certain velocity. For an outside observer, the light just seemed to be traveling in...
Feb27-14 07:04 PM
DaleSpam
28 1,061
If we consider a perfect relativistic fluid it has energy momentum tensor $$T^{\mu \nu} = (\rho + p) U^\mu U^\nu +...
Feb27-14 05:53 PM
TrickyDicky
15 485
The solution of Einstein's field equations for a simple black hole show a slowing of time as you get close to the...
Feb27-14 11:44 AM
PAllen
37 2,077
Hi guys, Firstly apologies if this question has been asked before (or are stupid questions) or better explained...
Feb27-14 08:58 AM
jtbell
5 561
This is a purely terminological question. Consider the following setup: we have two inertial observers A and B at rest...
Feb26-14 04:28 PM
bcrowell
14 971
Hello To demonstrate that we can deduce from special relativity the existence of an observer who finds that his...
Feb26-14 01:26 PM
DaleSpam
54 2,182
I recently watched a video in Einstein's train though experiment. www.youtube.com/watch?v=wteiuxyqtoM From what...
Feb26-14 11:29 AM
Yashbhatt
17 727
Suppose we have an event horizon H which is a light-like, closed 2-surface. Photons radiated outwards at the horizon...
Feb25-14 09:41 PM
George Jones
3 340
Trying to understand the conservation of relativistic momentum, I thought of this problem. It's very simple, and...
Feb25-14 03:55 PM
epovo
2 287
I was just reading the sci.physics.faq http://math.ucr.edu/home/baez/physics/Relativity/SR/rigid_disk.html on the...
Feb25-14 02:46 PM
bcrowell
15 497
Hi all, I tried searching for this but failed to find an answer to my question. I am having an issue with properly...
Feb25-14 01:01 PM
scinoob
12 797
Howdy, This is my first post. Please be gentle. ;-) I have been thinking about the speed of light. Scenario...
Feb25-14 09:19 AM
dauto
4 451
Sorry I'm new to this. There are apparently four forces in the universe: Gravity, EM, Weak and Strong. Is gravity...
Feb24-14 04:19 PM
pervect
7 638
hi guys i have question can any body answer please. why the light fell in to the black hole whether it have no mass.
Feb24-14 02:43 AM
mra20x
3 334
Could spacetime itself be a field?
Feb24-14 12:01 AM
Fredrik
5 324
i have asked my physics and maths teacher a question which they could not answer, the question follows:- Does the...
Feb23-14 06:30 PM
pervect
15 796
I'm working through A. Zee's new EGR book, and I came to a step on tidal forces I couldn't follow. He presents the...
Feb23-14 10:33 AM
russelljbarry15
4 526
Is there an absolute sequence of events in the universe- independent of observation? It seems like so much emphasis is...
Feb23-14 03:08 AM
adrian_m
6 677
In the spirit of this forum I should first announce: -generally, I have no idea what I'm talking about but look for...
Feb23-14 12:29 AM
ghwellsjr
6 489
In Special Relativity the example is given of a pole that alternates color, as seen in its own rest frame. Someone in...
Feb22-14 09:56 PM
gabeeisenstei
19 699
Before I get down to business, I would like to note (you don't have to read this; feel free to skip to where it says...
Feb22-14 06:31 PM
pervect
2 316

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