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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 42,384
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 42,026
In special relativity we have the invariant spacetime interval ds2 = dx2 - c2dt2. If we think about classical...
Jan12-14 12:50 AM
AcidRainLiTE
4 609
In the case of swarms of particles, the stress energy tensor can be derived by considering the flow of energy and...
Jan10-14 08:38 PM
samalkhaiat
5 532
How does potential energy fit into mass-energy equivalence in SR? As with all forms of energy, a potential energy of...
Jan10-14 08:23 PM
Meir Achuz
4 668
Hi, I've read that the speed of light is consistent for all observers, no matter where they are. So, for instance,...
Jan10-14 06:20 PM
AlfieD
18 1,039
Hey, I'm trying to understand gravitational time dilation, but can not find a good explanation for what R equals in...
Jan8-14 10:45 PM
pervect
7 641
I've never fully understood how anything can actually fall into a black hole without the black hole evaporating first....
Jan8-14 01:46 PM
PeterDonis
86 4,702
Can anyone help me with Ex 4.1 in MTW? What is a 'generic' field? My expectation is that it would comprise an...
Jan8-14 12:31 PM
TerryW
7 1,185
This is something I have pondered for some while... it is so obvious that there must be an answer and is probably a...
Jan8-14 02:37 AM
A.T.
17 981
Hi guys, Can anyone please help me to grasp a minor detail in the derivation of the Belinfante-Rosenfeld version of...
Jan7-14 08:25 PM
Michael_1812
5 577
If we use only rest mass as the source of gravity, but use the rest of general relativity. What are the differences...
Jan7-14 02:40 PM
DaleSpam
29 1,447
I just wondered how I transform electromagnetic dipole moments. For example assuming I have magnetic dipole moment μ...
Jan7-14 10:08 AM
kuecken
4 396
Hi, I recently came across the idea that relativity can play a role in the repulsive force of a charge outside of a...
Jan6-14 05:21 PM
Jimmy87
7 736
New Pulsar Will Put General Relativity to the Test by Dr. Ken Croswell Astronomers have discovered the first...
Jan6-14 10:52 AM
CygnusX-1
0 505
In another current thread on the possible invariance of pressure, I mentioned: What is the current consensus on...
Jan6-14 08:20 AM
yuiop
12 1,110
If a space ship were going 99%c, and inside that spaceship was another spaceship going 99%c, and so on and so on. I...
Jan6-14 02:15 AM
ilikescience94
11 815
HI : Consider a cylinder of length L and volume V that contains one mole of an ideal gas. The familiar ideal gas law...
Jan5-14 01:17 PM
yuiop
27 1,396
I was thinking the other day:confused: The faster a person goes, the sooner he get to his destination. There has to...
Jan5-14 11:19 AM
mfb
21 1,115
hi, who can help me with this article because in my university its not avaliable thanks ...
Jan5-14 10:55 AM
Meir Achuz
2 443
When students are first introduced to special relativity, the first thing they are taught is the derivation of the...
Jan4-14 10:07 PM
jtbell
5 669
Hi Guys, Your previous insights on the thread regarding gravitational rod shortening along the radial axis really...
Jan4-14 10:02 PM
Pierre007080
4 566
I'm about to ask derivation of dilation time in terms of Special Relativity. I saw explanations in Introduction to...
Jan4-14 09:27 AM
Doc Al
1 390
Hi Guys, Is there a simple formula (like lorentz equations for SR) for rod shortening ALONG THE RADIAL (geodesic)...
Jan4-14 08:49 AM
DaleSpam
41 4,938
Hi everyone, I don't fully understand what is the regular method to state and solve problems in GR when no handy...
Jan4-14 08:08 AM
PAllen
1 483
Hey guys. I have a question regarding exercise 6.5 in MTW ("Radar Distance Indicator"). The exercise asks the...
Jan4-14 01:12 AM
PeterDonis
12 1,037
Hi, Suppose O is moving forward with respect to O at speed v. A light behind him is switched on at t and x...
Jan4-14 12:58 AM
ghwellsjr
28 1,555
If an "Object A" spins at nearly "c", and this object also is moving at any given posible speed. What happen with an...
Jan3-14 08:31 PM
WannabeNewton
8 566
Hi, In modern physics aether theories are obsolete, all inertial systems are equivalent. For rotational motion, the...
Jan3-14 07:12 PM
ZapperZ
80 3,993
I couldn't quite figure out how to describe it shortly hence the weird title. I was wondering what it would "look"...
Jan3-14 03:15 PM
ghwellsjr
5 606
Hi I am reading Stephan Hawking's Universe in the Nutshell and there I didnt understand this sentence "This...
Jan3-14 07:56 AM
DaleSpam
41 1,760
Surely I am missing something, can you explain what? If we shoot a gun while travelling on a train, the speed of...
Jan2-14 03:53 PM
DaleSpam
36 1,798
Does a photon, or any particle that travels at c, believe the universe to be 2 dimensional?
Jan2-14 12:11 PM
ZapperZ
9 504
Hi guys. The following question is related to exercise 3.7 from Rindler's SR/GR text:...
Jan2-14 10:29 AM
WannabeNewton
22 1,386
As you guys probably know, as an objects speed increases, so does its mass. I was wondering if a black hole could be...
Jan2-14 09:19 AM
ilikescience94
17 776
Good morning. I have calculated the components of the Ricci tensor for the Schwarzschild metric and they are all 0,...
Jan1-14 11:10 AM
CarlosLara
1 552
Does inertial motion (understood in the SR sense) exist in a curved spacetime?
Jan1-14 10:21 AM
TrickyDicky
17 744
I recently came across this paper http://arxiv.org/abs/physics/0504110v2 by Oas that is a semi-rant about how...
Dec31-13 05:48 PM
pervect
10 748
I have recently been involved in a rather animated discussion on another forum on the subject of "weight". To make a...
Dec31-13 05:35 PM
pervect
25 2,645
Many basic texts on relativity refer to the mass variation equation: m= gamma mo It seems that...
Dec31-13 04:05 PM
DaleSpam
22 1,140
Hello, Recently I've been researching how to add velocities in a relativistic way, very interesting stuff. But...
Dec31-13 01:42 PM
phyti
17 900
Here's the best of my understanding of the official explanation of what happens when O' fall in a black hole. ...
Dec31-13 09:37 AM
PeterDonis
4 555

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