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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 42,428
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 42,075
If you can "catch up" to the light reflected from the Earth at that time in the past. What kind of resolution would...
Aug13-14 03:13 AM
Gerinski
4 405
When you have a general coordinate chart on spacetime you have a lot of freedom to pick your coordinates, but you are...
Aug12-14 07:03 PM
Fredrik
1 216
The Riemann curvature of a unit sphere is sine-squared theta, where theta is the usual azimuthal angle in spherical ...
Aug12-14 04:16 PM
pervect
13 351
When neglecting gravity and body size, if a body rotating at uniform angular velocity about a central body sends a...
Aug12-14 01:49 AM
HALON
3 292
if we know K^{a b}= (∇^a*ζ^b -∇^b*ζ^a)/2, ζ is a killing vector, under the variation of metric g_{a b}→g_{a...
Aug11-14 05:34 PM
WannabeNewton
6 472
In Carroll's we read ...The Unruh effect teaches us the most important lesson of Quantum Field Theory (QFT) in...
Aug11-14 03:38 PM
Matterwave
1 287
I was looking up ways to solve the Einstein field equations when I came across a couple of sources. ...
Aug11-14 08:20 AM
robphy
2 308
I am pretty sure this question must have been asked before... However I was always wondering, what would a theory be...
Aug10-14 06:45 PM
ChrisVer
3 382
Two spaceships approach an observer from an equal distance and from an opposite direction with an equal speed in the...
Aug10-14 08:08 AM
Nugatory
2 381
This is a conceptual problem, right out of a book. Say Mavis is moving in a spaceship at 0.6c relative to Stanley on...
Aug10-14 02:47 AM
ghwellsjr
11 425
Theoretical question.... If an extremely long object approached the event horizon, lets say a torpedo shaped craft 1...
Aug9-14 07:11 PM
pervect
6 362
Why photons can't go any slower than the speed of light, in vacuum? Or if they could, then why they don't?
Aug9-14 03:41 PM
DaleSpam
74 1,716
Dear all, I was reading this...
Aug9-14 03:04 PM
dextercioby
2 207
If you have two counter-rotating streams of particles traveling at near luminal velocity then is there effective...
Aug9-14 10:25 AM
jtbell
4 368
I have a little bit confuse on the Simultaneity I know if there are 2 coordinates. One coordinate S' is moving V...
Aug9-14 09:57 AM
ghwellsjr
6 449
Recent data in qm suggest black holes could decompress into a white hole on either our universe or another as such is...
Aug8-14 11:42 PM
PeterDonis
1 311
I'm sure that most people on these forums are familiar with the similarities between compressible flow in aerodynamics...
Aug8-14 12:27 PM
jlefevre76
6 575
I have question on my own understanding.. So please correct me.. 1. It is said that mass of photon is zero; Or it...
Aug8-14 10:29 AM
jlefevre76
24 1,134
The free field Einstein-Maxwell action is often states as $$S = - \frac{1}{4}\int_M F^{\mu \nu} F_{\mu \nu}d^4 x +...
Aug7-14 11:24 PM
Matterwave
1 296
Ok, so if I were to travel towards a black hole at close to c, would the event horizon become visible? Let us...
Aug7-14 01:31 PM
tionis
41 1,442
hi, i am stucked with a confusion about michelson-morley experiment. I am not going into mathemtaical detail, the...
Aug7-14 01:37 AM
ghwellsjr
15 457
Meter sticks laid out around the rim of a rotating disk will foreshorten by the Lorentz factor. This means more of...
Aug6-14 10:10 AM
WannabeNewton
8 405
Consider two equal and opposite charges moving in the same direction and velocity v0, and are separated a distance R. ...
Aug6-14 04:07 AM
KatamariDamacy
13 463
Basically I am trying to lorentz transform the magnetic field along θ of a bunch particles which have a gaussian...
Aug6-14 03:12 AM
matt_crouch
4 290
Hi all, I am really curious about the final state conjecture in general relativity, but I don't really understand...
Aug5-14 03:36 PM
bcrowell
2 273
http://i57.tinypic.com/2j5n9s4.jpg Weve all seen this little fellas up there. Two brothers, twins, in their 60s....
Aug5-14 07:34 AM
DaleSpam
3 312
when muons are created in the atmosphere and fall to earth the earth clock runs faster. Thus, the "slower" muon clock...
Aug4-14 10:08 PM
PAllen
2 216
Do experiments like 1971's Hafele & Keating show that SR relativistic effects of time dilation are not mere products...
Aug4-14 03:50 AM
pervect
16 877
Hello everybody. I was recently brainstorming ways to make the Einstein field equations a little easier to solve (as...
Aug3-14 09:01 PM
Nugatory
3 280
Hi all, I was thinking about special relativity and spacetime and had the thought of measuring our velocity with...
Aug3-14 08:59 PM
Matterwave
8 443
I understood that the basic idea of the Michelson-Morley experiment was to measure the velocity of light, as seen from...
Aug3-14 11:18 AM
ghwellsjr
4 427
Ok so I read this on another site... "the Milky Way is part of the Local Group...The Local Group is calculated to move...
Aug3-14 02:42 AM
sublime56
9 481
Hi Just wondering about the orbital path of a high speed particle - eg electron in orbit. Is it length contracted?...
Aug2-14 11:24 PM
jartsa
3 346
Hi I have a new formula (or at least I think it's new) for predicting the wavelengths/frequencies of hydrogen's...
Aug2-14 03:35 PM
DaleSpam
1 352
I was thinking a bit earlier: What if you created a particle at infinity (ignore the normal particle rules for...
Aug1-14 10:43 PM
pervect
2 264
I recognize the analytical usefulness of having time, a parameter. However, does time really exist? If so, is there a...
Aug1-14 11:37 AM
ChrisVer
21 644
Considering that speed of light is constant and finite, then why are the time dilatation and length contraction...
Aug1-14 10:16 AM
tonyxon22
6 356
We know that distant galaxies (which are expanding) are sometimes expanding at rates that do not conform with our...
Aug1-14 08:22 AM
Drakkith
2 258
From my understanding and from what I have read Quantum Mechanics and Relativity do not mix well. I understand that...
Jul31-14 10:37 PM
WannabeNewton
3 318
This may be a stupid question, but have the various gravitational wave observatories around the world been tested by...
Jul31-14 03:42 PM
PeterDonis
2 223

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