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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 42,391
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 42,036
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...
Jul28-14 08:05 PM
pervect
3 447
Hi all. I'm working on a project that requires me to perform calculations in Fermi normal coordinates to certain...
Jul28-14 05:47 PM
George Jones
3 472
Hi, I am trying to show explicitly the isotropy of the stress energy tensor for a scalar field Phi. By varying the...
Jul28-14 11:27 AM
George Jones
7 603
I want to write a science-fiction story concerning the rapid increase in technology affecting the speed at which...
Jul28-14 09:13 AM
ghwellsjr
3 516
According to Einstein (e.g. in his book The Meaning of Relativity), a clock rotating about a central clock will be...
Jul28-14 12:51 AM
HALON
21 2,709
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
13 562
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
6 851
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 1,024
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
8 500
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
4 531
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
1 487
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 4,147
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
17 894
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
3 999
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
12 996
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 4,096
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
5 888
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
2 725
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
2 689
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 1,319
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 1,110
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 1,365
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 1,802
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 1,085
*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 2,201
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 2,143
Hi I am a new(ish) student of general relativity. I am currently reading 'Relativitiy DeMystified' However...
Jul19-14 03:58 AM
Nugatory
1 999
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 1,251
Hi I am teaching myself GTR from Dirac's book...
Jul18-14 04:00 PM
WannabeNewton
3 1,180
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 1,161
So as the title says, what are the physical reasons behind requiring the connection between tangent vector spaces to...
Jul18-14 10:53 AM
stevendaryl
27 3,704
Hello Everyone, I am new to this forum. I understood from sources that space-time is like a fabric. The massive...
Jul18-14 07:48 AM
A.T.
16 2,541
What does spacetime curvature means?
Jul18-14 05:03 AM
ChrisVer
13 1,239
Hi everyone, I just wanted to share this really cool game MIT Game Lab made, it's called A Slower Speed of Light:...
Jul18-14 03:15 AM
A.T.
3 1,643
Assume observer is located on the surface of the earth with a small amount of time dialation due to gravity. There are...
Jul17-14 11:21 PM
rcgldr
2 1,307
In "The Hidden Reality", Brian Greene mentions almost off-hand that inside the event horizon of a black hole, space...
Jul17-14 08:22 PM
PeterDonis
9 2,192
Is it possible to assume relativity is still basically correct and reject the b-theory of time? Or does a coherent...
Jul17-14 05:13 PM
Vanadium 50
2 1,130
Hello Forum, An event is a point in spacetime with spatial coordinates and a time coordinate: (x,y,z,t). An event...
Jul17-14 11:33 AM
fog37
7 1,637
Please excuse me for being a complete and utter pleb, my meager knowledge of Leonard Susskind's holographic principle...
Jul16-14 04:59 PM
pervect
8 1,939
Suppose you have a differentiable manifold where at each point you have attached a set of basis vectors...
Jul16-14 10:50 AM
George Jones
8 1,694

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