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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 42,478
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 42,134
Hi does anyone know a formal definition for why off diagonal ricci tensors are equal to zero in a symmetric standard...
Jan26-13 05:01 PM
bcrowell
3 527
hello, Please attached snapshot. Does the integral 7.9 equal to 0.5 \inthμσ dzμ/dτ dzσ/dτdτ ? I'm confused as to...
Jan26-13 01:28 PM
Bill_K
1 665
I'm trying to wrap my head around what happens as mass is converted to energy. In a nuclear reaction, it is my...
Jan26-13 11:35 AM
PeterDonis
14 1,260
I just read in a article that NASA has revisited an older theory and found they can improve on it greatly. here is a...
Jan25-13 11:21 PM
pervect
2 997
since energy absorbed by a BH is no longer available to the universe, why is that not a violation of the principle of...
Jan25-13 07:30 PM
PAllen
13 1,884
so i am hoping that all of you are familiar with the fact that a basic way of finding the distance between two points...
Jan25-13 10:40 AM
Mentz114
6 886
In General Relativity (GR), we have the _geodesic deviation equation_ (GDE) ...
Jan25-13 10:22 AM
Mentz114
29 2,610
I saw this question (in a far removed forum), and I thought it was interesting. Do we have any theoretical reason (or...
Jan25-13 05:48 AM
Garth
4 635
I am trying to improve my understand of the basic elements of GR. I have read that the earth orbits the sun because...
Jan25-13 02:48 AM
Johninch
25 2,288
I'm reading Spacetime and Geometry: An Introduction to General Relativity by Sean M. Carrol and in the chapter on...
Jan24-13 10:43 PM
tensor33
6 1,069
Can anyone explain proper time with a simple example analogous to real life please? I am having a problem...
Jan24-13 05:36 PM
pervect
7 694
How can space know how to curve from a black hole. My understanding is that the no information can escape a black...
Jan24-13 01:59 PM
DiracPool
17 1,349
Ok so i am aware that if someone manages to travel faster than light, they are technically "travelling through time"...
Jan24-13 11:23 AM
ZapperZ
1 620
EM radiation seems like a wave traveling through spacetime so, why isn't spacetime the same as ether?
Jan24-13 07:25 AM
DaleSpam
1 432
Hi, I've been wondering about this forever and I finally decided to ask on the forums. In relativistic index...
Jan23-13 11:38 PM
WannabeNewton
6 1,104
According to the special theory of relativity: The combined speed of any object’s motion through space and its motion...
Jan23-13 09:47 PM
DaleSpam
11 2,333
I know that mass warps spacetime and that's basically the force of gravity (warped spacetime), but why does mass warp...
Jan23-13 02:00 PM
Naty1
32 4,215
If earth is moving with the speed of 800 km/s in universe, then do we travel at 1/375 of the speed of light according...
Jan23-13 12:30 PM
arindamsinha
17 2,139
Do the Gravity Probe B results provided by NASA from 2011 support and lean in favor of a 4-dimensional everyday world?...
Jan22-13 10:26 PM
bcrowell
2 551
Earlier today I was on youtube when I saw this comment I went to respond to this saying that the light would blue...
Jan22-13 07:12 PM
PeterDonis
6 1,083
An arbitrary Lorentz transformation ##\Lambda## in 1+1 dimensions can be written as \begin{align}...
Jan22-13 05:04 PM
dextercioby
5 807
The thought experiment starts with the basic experiment shown here: ...
Jan22-13 06:45 AM
soprano
10 1,858
Question to the physicists in here: Would it be possible to spin a metal disk such that it increases mass along the...
Jan21-13 07:36 PM
PeterDonis
3 881
If you are traveling .6C away from your point of origin and your friend is traveling .6C away from the same point of...
Jan21-13 04:05 AM
harrylin
8 1,091
Is a negative zeroth-component of a four-velocity V^0 with a curved space metric of signature -+++ allowed?
Jan21-13 03:56 AM
c299792458
2 859
I thought about an idea that keeps spinning my head around. It's proven that the faster you move the slower the time...
Jan20-13 02:43 PM
SJBauer
21 1,863
Hey all! Two things came to my mind about black holes, and I hope some of you can help me out :) 1. Say you have a...
Jan19-13 09:01 PM
curiousasker
17 1,937
Can the Planck relation, and the Heisenberg and the time-energy uncertainty principles be derived, or produced, from...
Jan19-13 04:22 PM
stevendaryl
13 1,613
Hi all, I'm having a discussion with someone who believes they understand GR, here is their understanding of how...
Jan19-13 03:15 PM
A Troubled Man
26 2,507
So when a moving object reaches the speed of light time dilates so I assume if an object that has mass somehow...
Jan19-13 08:28 AM
PAllen
61 4,790
what is the formula of spin connection in GR ? can we show it in term of structure coefficients ?
Jan19-13 04:29 AM
haushofer
10 2,046
I know there are quite a few questions about this drive due to the recent news but I have a question that I haven't...
Jan18-13 08:41 PM
SJBauer
3 925
Well, to start off. I'm in my second year of physics, (honors last year, AP this year) and we haven't talked about any...
Jan18-13 07:57 PM
Fredrik
11 1,352
This is the barn pole paradox using a slightly curved pole and a silo instead of a perfectly straight pole and doors...
Jan18-13 03:17 AM
Sylvia Else
4 963
Is there anyone here who could help me understand the state of physicists understanding just prior to 1905 and...
Jan17-13 09:39 AM
Thinker007
15 1,495
Hi friends, going through Palatini gravity, I cannot do the variation for palatini f(R) gravity and get to the...
Jan17-13 09:37 AM
shadi_s10
7 803
Hey all, making my way through Landau and Lifgarbagez classical theory of fields and i had a specific question on the...
Jan16-13 08:42 AM
shadi_s10
9 1,747
i can't get my head around the twin paradox at all. so twins A and B move relative to each other and as a result,...
Jan15-13 04:07 PM
PeterDonis
16 1,923
What is the best software for GR calculations ? GRTensor ?
Jan15-13 12:37 PM
bcrowell
6 1,061
hi guys, i have a basic question on special relativity.. if the inertial reference frame denotes the frames that holds...
Jan15-13 10:09 AM
harrylin
8 943

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