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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 41,327
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 40,956
Does putting the concept of acceleration in SR make it equivalent to GR? I see a lot of sources (including many...
Dec20-12 11:53 AM
PeterDonis
49 3,553
hi! thank you for all answers in this topic in previous threatin same topic. i open this new thread in same topic...
Dec20-12 06:25 AM
DaleSpam
6 784
While explaining how science works in my biology class my biology teacher said that relativity had been proved wrong,...
Dec19-12 03:19 PM
PeterDonis
9 1,009
Is it enough to see the covariance of the wave equation the fourth-vector potential (\phi, \bar{A}) satisfy? I mean,...
Dec19-12 02:38 PM
PeterDonis
3 541
Dear Friends Is there any coordinate tetrad in spacetime except Cartesian basis ? since tetrad basis should be...
Dec19-12 02:26 PM
Worldline
2 763
hi can inertial reference frame be in different sizes at least in theory? i mean that can there be two different...
Dec19-12 02:03 PM
George Jones
29 1,636
Hi All, I think that I understand (as far as you can!) the ideas behind explaining why two twins have different...
Dec19-12 09:55 AM
ghwellsjr
7 1,159
EDIT: Problem solved, the object would approach escape velocity (11km/s). I'm sorry this was a bad question.
Dec18-12 04:45 PM
pervect
3 615
Trying to put aside, somehow, questions of body elasticity, How long does it take on average for a body, in outer...
Dec18-12 08:59 AM
PeterDonis
21 1,947
Hi guys! I have a small doubt in the concept of age of our universe.Everyone say that our universe is 14.4 billion...
Dec18-12 08:14 AM
Lino
11 1,024
I just want to make sure that the following assumption is equivaent to the first postulate. Consider two inertial...
Dec18-12 05:21 AM
metalrose
29 2,678
I have often thought about how the one-way speed of light can be measured without having to use synchronized clocks,...
Dec18-12 04:02 AM
Jorrie
49 4,178
If I travel toward a star 100 ly distance (measured when at "rest") at a low % of c, the star will continue to appear...
Dec18-12 03:35 AM
jartsa
24 3,075
I am trying to understand what exactly general covariance states. As I understand general covariance appeared as...
Dec18-12 01:52 AM
haushofer
98 8,604
I would like to get a mathematically precise formulation of the Ehlers-Geren-Sachs theorem. I have heard that this...
Dec17-12 06:00 PM
bcrowell
1 523
Would light at 10nm be traveling at a slower speed due to having to go a shorter distance than light at 1mm? The IR...
Dec17-12 02:24 PM
nitsuj
2 591
According to the Schwarzchild metric an interval of proper time d\tau at a fixed distance r from an object of mass M...
Dec17-12 01:58 AM
pervect
3 708
Say we were given an expression for the energy-momentum tensor (also assuming a perfect fluid), without getting into...
Dec17-12 01:20 AM
PAllen
24 1,850
I thought the speed of light was constant independent of the motions of the observer and light source. So I don't...
Dec16-12 08:35 PM
k!rl
4 743
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 9,915
Hello! I was wondering if anyone knew of any good references (texts or whatever) to learn about the Thomas Precession....
Dec16-12 04:13 PM
pervect
3 796
How is the speed of light, and path of travel, effected in time-space distorted (by say, gravity)? We know that the...
Dec16-12 11:41 AM
San K
2 762
Suppose there is a nuclear bomb orbiting around the earth at speed close to c. Some Bad Guy tries to set off the bomb...
Dec16-12 08:00 AM
DaleSpam
12 922
Why is it that when describing time dilation, we say that the object (the thing observed) slows down relative to the...
Dec16-12 06:04 AM
ghwellsjr
20 1,582
I wonder if there's a connection and it's a requirement or it's a completely different matter and space(time) warps...
Dec15-12 09:16 PM
bcrowell
9 1,083
I'm not sure if this post belongs with general physics or relativity, so feel free to move it. I am trying to get a...
Dec15-12 07:27 PM
K^2
12 1,383
This may be a stupid question, but why can't the expansion/contraction of spacetime from a gravitational wave be used...
Dec15-12 01:52 PM
dllahr
2 690
I enjoyed this video about tensors very much. I would recommend it to anyone seeking to understand the concept in...
Dec15-12 11:19 AM
jmatt
1 597
Do photons obey the 1/r^2 gravity law? This was a question that came up in our recent PhySoc meeting and no-one...
Dec15-12 07:01 AM
andrien
97 6,595
While simultaneity conventions for inertial frames in flat spacetime (SR) are non-controversial, numerous questions,...
Dec14-12 10:12 PM
PeterDonis
190 17,115
if you have 2 spaceships and they depart in exactly the opposite direction from a starting point, say a space station,...
Dec14-12 07:57 PM
ZapperZ
56 5,366
The probelm is the following: There is a uniform I current measure in a rectangular loop while this is moving in a...
Dec14-12 02:51 PM
Ramapaa
0 566
Discussions involving Hawking radiation in the study of black holes usually require their preexistence; however, if we...
Dec14-12 01:33 AM
atyy
36 2,721
Consider observer A at rest, seeing observer B traveling in a rocket at high speed towards a star C. Star C is at rest...
Dec14-12 01:21 AM
Mike Holland
14 1,455
When we look at stars that are far away from earth, they appear to be still in the sky. However, these stars are...
Dec14-12 12:36 AM
PAllen
2 636
Hi, I was wondering if anyone could clarify something for me. I have been reading about the curvature of...
Dec13-12 09:38 PM
darkthoughts
22 3,313
In a paper about field theory in curved spacetime, an author says that the Lagrangian density for a free scalar...
Dec13-12 03:34 PM
elfmotat
3 640
In Einstein field equations,the term that is responsible for curving Space-Time is the Stress-Energy tensor.But we...
Dec12-12 03:01 PM
pervect
8 1,024
I am just beginning graduate self-study of Special and General Relativity, so forgive me if my question seems niave. ...
Dec12-12 01:20 PM
Meir Achuz
6 1,136
Our professor derived a Minkowski force like this: F^\mu = \left Does this mean that i can write 4-force...
Dec12-12 01:04 PM
Meir Achuz
4 1,212

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