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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 42,469
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 42,118
Do you know any book written by a great physicist where he talks about black holes? I always enjoy reading the more...
Feb19-11 12:32 PM
JesseM
1 697
Seeing the horn (which is like a water vortex) of General Relativity, it seems that the position of the Sun is at the...
Feb19-11 11:32 AM
JesseM
10 1,446
GR predict that a photon climbing in the earths gravitational field will lose energy and will consequently be...
Feb19-11 10:19 AM
Jonathan Scott
3 1,459
I am going to talk about the famous train-platform experiment where two lightnings strike both ends of the platform...
Feb19-11 09:13 AM
Mohammed_I
2 2,713
Based on the wiki article: http://en.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory Cartan gravity is not...
Feb19-11 05:52 AM
tom.stoer
7 3,402
Hi, I have a question which was raised after reading the article "Derivation of the string equation of motion in...
Feb19-11 03:10 AM
haushofer
16 2,366
In Stephen Hawkins videos he told that time was affected by mass. Why would that be? Can anyone tell?
Feb18-11 09:41 PM
JesseM
7 1,334
Hello! This is my first post on this forums, always been here since a year back through google while looking for some...
Feb18-11 01:46 PM
tiny-tim
5 1,636
I was discussing with my E&M professor the idea of faster than light information exchange, which of course we found to...
Feb18-11 01:36 PM
Phrak
15 1,869
Would General Relativity predict that two initially parallel light beams will converge due to their energy curving...
Feb18-11 04:45 AM
johne1618
5 2,190
Hi. If Newtons theory of gravity was changed - so that gravity is considered to propagate at the speed of light AND...
Feb17-11 04:32 PM
Hernik
8 1,051
For E=mc2 I'm having trouble understanding intuitively how every kilogram of m conveniently is associated with a...
Feb17-11 12:49 PM
JesseM
6 1,418
ok, i just can't figure this one out. you have heard of the example of the 2 wires, and depending on their...
Feb17-11 11:19 AM
JesseM
1 1,254
In A First Course in General Relativity, the use of the weak field approximation is confusing to me. I constantly get...
Feb16-11 08:58 PM
WannabeNewton
9 1,353
Most people on this forum know the basic theory of black hole formation. When a massive star runs out of fuel there is...
Feb16-11 11:27 AM
Naty1
5 1,950
Pretty basic relativity questions. Have any of you read Ender's Game by Orson Scott Card? Great book by the way. ...
Feb16-11 11:18 AM
JesseM
10 6,544
Hello, I am aware that this question was the subject of a topic on this site, but it did not fully answer my question....
Feb16-11 08:47 AM
Naty1
5 2,248
This might be a stupid question.. Why does curved spacetime cause objects with mass to accelerate towards each...
Feb16-11 08:35 AM
Naty1
20 3,276
The Schwarzschild solution to the field equations is a vacuum solution for a spherically symmetric mass and provides...
Feb16-11 06:00 AM
Mentz114
7 1,284
My question deals with how the mass of light effects its speed. First question, does light actually have mass? If so...
Feb16-11 04:00 AM
ZapperZ
15 2,311
Who are the authors of relativity theory? From Wikipedia: " Tesla also believed that much of Albert Einstein's...
Feb15-11 10:21 PM
PAllen
36 5,295
hey, I heard about improper Lorentz transformations, but I did not really understand what they are. I just know...
Feb15-11 02:24 PM
the_house
1 1,770
Quantum Entanglement allows spatially separated entangled particles to have impact on each other instantly (overcoming...
Feb15-11 12:44 PM
Mentz114
5 1,596
Hi everyone, Today a strange thought came into my mind. We know that the mass of an object increases as it gets...
Feb14-11 05:50 PM
schonovic
63 7,928
OK, i have a final coming up, and i need a little help.... i need to know how and why an object moving faster acquires...
Feb14-11 04:29 PM
Neandethal00
19 4,580
Alice is free-falling towards the event horizon (EH) of a black hole (BH) large enough such that local tidal forces...
Feb14-11 03:17 PM
DrGreg
15 1,675
A tachyon is a hypothesized particle that has imaginary mass (imaginary numbers) and moves faster than light speed. I...
Feb14-11 01:52 AM
Wolf5370
19 2,480
Greetings everyone, I understand the derivation of the Lorentz transformations, and have not had trouble applying...
Feb13-11 03:50 PM
phyti
12 1,361
I don't think this should be a very difficult question for people who are used to working with tensors, but I'm new to...
Feb13-11 02:01 PM
Fredrik
28 1,848
hi, I was going through the problem when light is bent by gravity. The newtonian result is half of result...
Feb13-11 12:48 PM
Cleonis
4 1,271
How is Lorentz invariance handled in GR? I know that there is no global Lorentz invariance in GR, instead it only...
Feb13-11 06:55 AM
TrickyDicky
56 4,681
An observer (in zero gravity) witnesses two parallel but widely separated beams of light that are transmited at the...
Feb12-11 05:47 PM
harrylin
77 8,010
The Lorentz transformation are given by (see the attachment) x'=(x-vt)/√(1-v^2/c^2 ) t'=(t-vx/c^2)/√(1-v^2/c^2 )...
Feb12-11 05:38 PM
harrylin
115 8,989
how the particle moving at a speed near to that of light interact to it's surrounding,considering the very fact of...
Feb12-11 11:20 AM
DaleSpam
23 1,967
Hey, For a problem I am working on I need to know if the energy-momentum tensor of the Reissner- Nordstrom metric...
Feb12-11 09:29 AM
Mentz114
1 1,019
Did this experiment show that there was no ether . Because one way the light had to move up stream and it would take...
Feb11-11 08:05 PM
phyti
229 22,633
Hi all, I've read some references to an example of a person on a train using a flashligt and one outside the train...
Feb11-11 07:19 PM
Fredrik
2 1,278
Why does General Relativity break-down at Plank Temperature?
Feb11-11 12:49 PM
bcrowell
1 1,098
Hello! Is someone aware if there are lecture notes about Lie Groups from a physics course? I would to study an...
Feb11-11 06:57 AM
A. Neumaier
1 843
Hi, It's found it Carroll that r=\frac{L^2}{GM(1+e\cos{((1-\alpha)\phi)}} . He states that this means we've found...
Feb11-11 03:17 AM
LAHLH
2 1,611

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