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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 41,548
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 41,192
As you may already know, given a time-like congruence describing some extended body with world-tube ##\mu## embedded...
T 05:05 PM
WannabeNewton
30 3,033
Constant for all observers? I have heard that maxwell showed that the speed of light is constant for all observers...
T 12:01 PM
Evo
45 2,167
A general summary of the experiment is that when the light clock is stationary on the platform it runs as normal, up...
T 09:25 AM
tonyxon22
9 562
I understood that the basic idea of the Michelson-Morley experiment was to measure the velocity of light, as seen from...
T 09:01 AM
ghwellsjr
2 153
The basic question was inspired by some other recent threads on the "fabric of space". If we imagine a 2-d spatial...
T 05:44 AM
haael
4 193
I've always been interested in Space-Time fabric and have been trying to get a clear answer to whether or not its an...
T 02:12 AM
Bandersnatch
14 561
I've read that the Alcubierre Drive depends on the existence of negative mass, but I've seen that physicists say it...
T 02:06 AM
Simon Bridge
1 97
Isn't the force of gravity just a result of the shape of space as it is affected by masses within it? Why is it...
Y 08:05 PM
pervect
3 239
Hi all. I'm working on a project that requires me to perform calculations in Fermi normal coordinates to certain...
Y 05:47 PM
George Jones
3 307
Hi, I am trying to show explicitly the isotropy of the stress energy tensor for a scalar field Phi. By varying the...
Y 11:27 AM
George Jones
7 419
I want to write a science-fiction story concerning the rapid increase in technology affecting the speed at which...
Y 09:13 AM
ghwellsjr
3 309
According to Einstein (e.g. in his book The Meaning of Relativity), a clock rotating about a central clock will be...
Y 12:51 AM
HALON
21 2,094
Whatever spacetime be made of strings or some other erotic substance it seems that it doesn't have mass so what causes...
Jul27-14 07:39 PM
DaleSpam
13 353
Thinking about how so much matter can be squeezed into a singularity, the answer (if I understand correctly) is that...
Jul27-14 03:40 PM
Vanadium 50
6 648
Hi, I would be really grateful if someone could help me with two questions I have, both have puzzled me on and off...
Jul27-14 10:33 AM
CraigDxHypo
16 768
Here is a new video, addressing a common question on this forum: jlTVIMOix3I It's similar to that one, but has...
Jul27-14 04:45 AM
A.T.
0 221
I have question on my own understanding.. So please correct me.. 1. It is said that mass of photon is zero; Or it...
Jul26-14 07:25 PM
Nugatory
3 314
I have a metric given as a line element differential ds^2. I have written down the 3x3 matrix with the coefficients. ...
Jul26-14 06:56 PM
ChrisVer
8 348
Do experiments like 1971's Hafele & Keating show that SR relativistic effects of time dilation are not mere products...
Jul26-14 10:39 AM
PeterDonis
2 300
What does it mean to boost something along the z axis? To give some acceleration to it, or to spatially translate it?...
Jul25-14 09:52 PM
WannabeNewton
4 382
So I was thinking about the space time field and trying to wrap my head around how it is actually bent around a mass. ...
Jul25-14 12:38 PM
Nugatory
1 362
If velocity is relative and if we cannot say which is moving away from what *objectivley, how do we say that time...
Jul25-14 01:23 AM
objecta99
61 3,193
It is my understanding that at the most fundamental level, a black hole is simply an object with a gravitational field...
Jul24-14 03:31 PM
willoughby
17 682
I was reading Einstein's paper "The Foundation of the General Theory of Relativity" and as i understood, he tried to...
Jul24-14 08:03 AM
nixed
3 811
We measure time based off of atomic vibrations, so time dilation from gravity and velocity are nothing more than...
Jul24-14 06:31 AM
DaleSpam
12 770
Hello everyone! My question is this: Do we believe time is a constant and forces such as gravity affect our perception...
Jul23-14 12:18 PM
DaleSpam
41 3,334
Is there a simple intuitive description of what the Ricci tensor and scalar represent? I have what seems to me a...
Jul23-14 11:24 AM
robphy
5 693
1. What exactly is the cosmological constant, what is its value (or how do you derive it if it is something that must...
Jul22-14 09:43 PM
bcrowell
2 560
I was wondering why can't I use formulas from the "Special Relativity" in cases like: F=mv^2/r Or F=qvB...
Jul22-14 12:56 AM
ghost313
2 537
Are there any EXACT solutions similar to Schwarzschild or Kerr in a spacetime which is not asymptotically flat; e.g....
Jul21-14 01:36 PM
George Jones
3 1,062
Hello everyone. I am attempting to teach myself about special relativity, and have learned a derivation for the...
Jul21-14 01:31 PM
toothpaste666
8 889
I got stuck in deriving the velocity of the particle from the acceleration equation. Here are the details of the...
Jul20-14 10:07 PM
ecastro
6 1,122
Hello. I'm a layperson curious about physics. I've read that Quantum Gravity could eliminate the predicted...
Jul20-14 06:22 PM
sshai45
11 1,461
I have recently gone over the derivation of the stress energy momentum tensor elements for the special case of dust....
Jul20-14 04:42 PM
space-time
4 871
*Edit: I noticed I may have posted this question on the wrong forum... if this is the case, could you please move it...
Jul19-14 10:23 AM
coleman123
8 1,894
its been years since I took a physics course so I might have what amounts to a really dumb question. However, I got...
Jul19-14 10:21 AM
objecta99
19 1,737
Hi I am a new(ish) student of general relativity. I am currently reading 'Relativitiy DeMystified' However...
Jul19-14 03:58 AM
Nugatory
1 819
Hi, I'm trying to derive the displacement of an object with proper acceleration (constant) α. t is our laboratory...
Jul18-14 06:45 PM
pervect
2 1,007
Hi I am teaching myself GTR from Dirac's book...
Jul18-14 04:00 PM
WannabeNewton
3 979
Starting at the beginning and have been having some difficulty explaining the implications of the constancy of the...
Jul18-14 03:30 PM
etcota
3 941

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