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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 41,662
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 41,311
I'm having a bit of a debate on travelling to AC. I was wondering if someone can post calculatons to show how long it...
Jan21-11 01:34 PM
17 2,711
We have talked about black hole, Unruh and cosmological horizons in these forums....I am wondering if a simple...
Jan21-11 11:18 AM
58 4,516
Probably this has an easy answer but I can't see it just now, according to the principle of relativity we shouldn't be...
Jan21-11 10:52 AM
20 2,173
let's say a train is traveling at relativistic speed along a straight line to right, and a man is standing in the...
Jan21-11 09:05 AM
3 1,008
I'm confused about how photons are able to split into electrons and positrons. Learning about four dimensional...
Jan21-11 08:17 AM
4 1,188
I understand that the distance between 2 points in 2 dimensions sqrt(x^2 + y^2) and in 3 dimensions it's sqrt(x^2 +...
Jan21-11 03:12 AM
4 1,152
Suppose we are looking from an inertial frame at two events in a region of space-time. The first event A (0,0,0,0) is...
Jan21-11 01:52 AM
22 2,056
What do we mean by "Time is elastic"? How can we see that time is elastic? Is there anyway to illustrate this?
Jan20-11 08:48 PM
5 1,634
If we rearrange Einstein's mass-energy equivallency equation we get. m=\frac{E\sqrt{1-\beta^{2}}}{c^{2}} A...
Jan20-11 01:19 PM
8 1,442
Hello PF Folks. So Einsteins Special Thoery of Relativity is based upon two principles (im shortening them for...
Jan20-11 09:28 AM
23 4,037
Is there such an animal as an energy continuity equation, or one involving Pmu or the stress energy tensor? It...
Jan20-11 04:09 AM
2 1,827
1. What are the value of physics constant in Kerr metric, including G, M, c, a, r, or others? I expect to...
Jan20-11 02:01 AM
2 1,159
when we say "a topological action", do we only mean that the action is metric free? or is there some other meaning for...
Jan19-11 04:46 PM
2 2,082
i have read quite a bit about gravity waves, and even worked (as a lab tech) on an early GW experiment at LSU back in...
Jan19-11 04:36 PM
3 735
Folks, apologies for reviving a thread that I know has been picked over, but I am a bit confused. I understand the...
Jan19-11 10:26 AM
20 2,488
Hello. When one is converting between coordinate systems, the Jacobian arises as a necessary consequence of the...
Jan19-11 10:20 AM
2 1,702
I'm a little confused about what an observer would see while watching something fall into a black hole. From what...
Jan19-11 06:39 AM
24 3,047
if light can be affected by gravity then why is it said to have no mass? and sience light is affected by gravity.. if...
Jan19-11 05:57 AM
46 6,842
To travel by space ship to Andromeda (2.5 million light years) within a life time (say 50 years) you would have to...
Jan18-11 03:39 PM
8 3,206
In the LHC, what radial and tangential G-forces does a proton experience where from start to finish? Where would each...
Jan18-11 03:10 PM
0 999
What are the symmetries determined by FRW spacetime? I guess they include Lorentz symmetry, rotationally and...
Jan18-11 01:58 PM
6 2,463
Ok so in Einstein's thought experiment with the train, everything makes sense except... Einstein is stating that an...
Jan18-11 08:29 AM
7 1,047
Hi, Is Spacetime inside the Quantum Vacuum or is the Quantum Vacuum inside or fill up Spacetime?
Jan18-11 12:25 AM
2 824
Is it \nabla_\mu\nabla_\nu A^\alpha={A^\alpha}_{;\mu\nu} or \nabla_\mu\nabla_\nu...
Jan17-11 10:32 PM
3 1,431
Hi I tried using the search function but it keeps timing out on me. Anyway I'm trying to find a good description...
Jan17-11 04:59 PM
6 7,940
This is a two part question. Part 1: I am embarrassed to ask but if someone could please help me. I was thinking about...
Jan17-11 10:10 AM
23 2,828
I was reading in a paper for Chamseddine the following: "In the past many attempts were made to construct gravity...
Jan17-11 05:04 AM
10 2,453
I am confused with some of the aspects of time dilation. I read the derivation (the one with the mirrors) and I...
Jan16-11 11:08 PM
10 2,279
If gravity and acceleration are "cousins," How much faster does time proceed on Earth than floating motionless (or...
Jan16-11 08:21 PM
10 2,569
I'm not very fund of the subject, but what i know is that the Schwarzschild metric and other known solutions for...
Jan16-11 03:09 PM
4 923
Why must the 4-momentum for photons p^\mu =(\frac{h\nu}{c},\frac{h\nu}{c} \textbf{e}) transform as a 4-vector in...
Jan16-11 02:09 PM
2 1,041
I'd like to start by mentioning that I have very little in the way of experience on the subject, so forgive me if my...
Jan15-11 09:23 PM
11 1,475
So I am an engineering graduate trying to teach myself some general relativity. I have tried to solve the Einstein...
Jan15-11 01:57 PM
4 2,615
I do not fully understand the time dialation formula, if the answer is nearer to 1 does that mean time itself under...
Jan15-11 01:30 PM
3 834
In the process of proving that the d'Alembert operator is invariant under Lorentz transformations, it was...
Jan15-11 12:02 PM
2 1,645
Q.) If i were to travel at 100,000 m/s in an exact horizontal line away from earth for approximately 1 year, when i...
Jan15-11 09:33 AM
4 1,551
Suppose you have a source that send a very strong straight beam of light (say laser ) Then you direct the light...
Jan15-11 07:47 AM
59 7,756
Is there any merit to the idea that all black hole singularities are in essence one and the same singularity?
Jan15-11 02:49 AM
13 1,379
Can someone give a definition of Killing Horizon along with a few examples that clearly illustrate the difference...
Jan14-11 08:44 PM
0 782
Can anyone please tell me what does SPEED OF LIGHT WITH RESPECT TO AN OBSERVER mean? Some explain it like this: If...
Jan14-11 02:43 PM
21 2,553

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