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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 42,290
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 41,922
I know that magnetic force due to a current carrying wire on a test charge moving w.r.t the wire(along the wire), can...
Mar26-12 05:20 PM
DaleSpam
156 13,456
I found a decent page explaining this but it's a little deep for my understanding. I think I understand the basics...
Jan30-09 10:44 PM
Austin0
155 12,545
People always say the Universe is 14 billions year old. But what does that mean? What is the time of the...
Jan23-12 10:07 PM
DaleSpam
155 14,516
We consider an spacelike infinitesimal separation {ds}^{2}<0 ds=+ or -ib Now I integrate ds along some path...
Jan10-11 11:57 PM
PAllen
154 9,257
I posted this thought experiment in a previous thread before 4 months or so, but I would like to reiterate it now: A...
Jan30-12 10:19 PM
JDoolin
154 8,753
The Abraham's photon moment p_A=hbar*w/n*c is not Lorentz covariant, but it has been confirmed by several experiments....
Nov23-11 07:20 AM
Vanadium 50
153 16,991
I'm curious about how people here view Einstein's prescription for determining simultaneity in an inertial frame, and...
May27-08 12:26 AM
Ken G
152 17,440
I recently came across a very cool book called Div, Grad, and Curl are Dead by Burke. This is apparently a bit of a...
Feb1-13 06:23 PM
atyy
151 10,506
When a source begins to emit light, what exactly is occurring to produce an instantaneous velocity of c? If we're...
Jul11-11 04:24 PM
GrayGhost
150 12,375
Mod note: Posts split off from http://www.physicsforums.com/showthread.php?p=4468795 Hi, WN, might the OP be...
Aug15-13 03:09 PM
PeterDonis
150 4,997
Good evening, As an effort for trying to understand Lorentz transformations, I'm trying to use them to derive the...
Jun8-10 05:16 AM
AdVen
149 12,116
So I did a degree some time ago and after watching a programme on TV, I decided to revisit relativity and set myself...
Feb8-11 07:05 PM
DaleSpam
149 13,802
I'm a little confused about certain assumptions usually made in GR as to how rigorous they are mathematically...
Dec8-12 06:33 AM
TrickyDicky
149 10,578
Anything that has energy must have some form of mass. Photons have both energy and momentum (Just because we chose to...
Jan25-10 08:51 AM
Frame Dragger
148 9,639
I know that this is a very basic question but what is the correct formula for time dilation? In Wikipedia etc. I...
Nov10-09 12:29 PM
Rasalhague
146 14,856
Does Acceleration affect Lorentz contraction? Suppose their was a Circle spinning around its center then its outer...
Feb8-10 12:28 PM
heldervelez
145 16,944
According to Weyl's postulate timelike geodesics should be hypersurface orthogonal, this in itself seems to clash with...
Oct19-11 03:58 PM
TrickyDicky
145 10,343
I have a thought experiment for anyone interested. All replies welcome: Imagine if you will, a large spherical...
Jul14-06 10:34 AM
coalquay404
144 8,311
The relativistic momentum formula is p = \frac{mv}{\sqrt{1-v/c^{2}}}. Since photons are massless and travel the speed...
Jul16-11 06:08 PM
bcrowell
143 10,514
A variant of the classic twin paradox. There are three triplets, who have the boring names of Adam, Bob and...
Sep19-13 09:24 AM
ghwellsjr
143 25,485
Reading "Exploring Black Holes" I find that a particle following a geodesic towards a black hole always reaches the...
Dec28-09 06:37 AM
George Jones
142 17,575
Has anyone here read and understood this introduction to Thomas rotation/precession? ...
Aug26-10 08:25 PM
yuiop
142 12,888
If it is impossible to distinguish rest from motion, how is it that one of the twins' clock is slower than the other...
Sep5-10 12:54 PM
JesseM
142 9,760
Is it true that in GR the gauge is described by Guv while the potential is the Christoffel symbols just like the gauge...
Feb26-12 07:04 PM
DaleSpam
142 10,451
I am asking this question in order to clarify something which I thought I had understood. First of all, let me say...
Jan31-13 10:54 AM
PeterDonis
141 8,560
I'm sticking my neck out because I just worked this out and may regret this post later. The spaceship paradox...
May1-14 05:12 PM
Mentz114
141 7,866
I understand the principle of equivalence (e.g. thought-experiments with lifts etc), but how come that from it one can...
Jan29-11 06:17 AM
Mueiz
140 10,389
This comes from this thread http://www.physicsforums.com/showthread.php?t=647627&page=7 discussion in posts...
Dec2-12 05:36 AM
harrylin
140 11,758
I've been told that time slows down so much inside a black hole that an event horizon never actually comes into...
Apr16-13 01:59 AM
PAllen
140 7,923
Hello! Are the transformations such as time dilation, length contraction and relativistic mass just observed ones or...
Oct13-13 01:54 PM
TrickyDicky
140 68,637
He everybody :) I guess I am not the only one who cannot comprehend the idea that the light has same speed for all...
Sep17-11 07:32 PM
ghwellsjr
139 9,571
In his paper, Chou et. al., 2010 has demonstrated that an atomic clock at the height of our head ticks faster than an...
Aug6-13 02:26 AM
harrylin
138 7,599
In another thread, it's considered a generally accepted fact that the WEP is not valid anymore the way it was...
May5-11 10:53 AM
TrickyDicky
137 8,385
Processes taking place near high gravitation or moving at near light speed are slowed. General relativity tells that...
May31-13 01:53 AM
dayalanand roy
137 10,824
Can someone please clarify for me whether length contraction in special relativity is considered a physical effect (a...
Jun16-13 09:32 AM
ghwellsjr
137 9,861
I'm kind of a noob who's posted a question or two here before to settle arguments and such. Please don't kill me if...
Apr7-10 09:27 PM
stevmg
135 12,363
Can someone help me with understanding and explaining the Special theory of relativity. I know the basics (time...
Dec16-12 07:29 PM
DaleSpam
135 10,102
Could there be an absolute 'state of reference' somewhere in the universe, perhaps at the location of the original...
Mar22-14 05:56 AM
DaleSpam
135 4,132
When a frame is moving in relation to an observer in his rest frame at infinity, and the frame is in a gravitational...
Jun6-10 04:15 AM
ZapperZ
134 10,601
What do you think about this explanation of EM-fields using SR? 1TKSfAkWWN0
Oct16-13 01:12 PM
Strafespar
134 45,663

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