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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 42,457
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 42,107
Suppose there are two observers seperated by distance of 2 light minutes. They have 2 identical clocks, which are...
Oct25-11 06:33 AM
TGlad
6 888
In thinking about time I have developed the (easy) realization that whenever we indicate a duration we are comparing...
Oct25-11 05:15 AM
A.T.
61 6,173
There are plenty of circumstances in special relativity where Newton's 3rd Law appears to be violated, usually with...
Oct24-11 11:22 PM
AdranGarrison
3 1,211
Ok, I've been wondering about this question for many years and I don't know whether I just don't understand the basic...
Oct24-11 08:13 PM
PAllen
8 1,455
Hi, I'm reading this wikipedia article on the metric connection, and it says that the Levi-Civita connection is a...
Oct24-11 02:52 PM
UndeadCat
11 2,244
Then why do we get galaxies in (relatively) flat discs and black holes that emit radiation in a single plane?
Oct24-11 02:29 PM
Naty1
2 1,100
earth rotates around sun @ R speed, earth spins on its axis @ S speed. Both R & S are counterclockwise. On the equator...
Oct24-11 07:21 AM
pokk
5 1,807
I'm trying to understand relativity on a simple example: 2 objects A & B moving in exactly opposite directions at 0.6c...
Oct23-11 02:03 PM
ghwellsjr
11 2,191
In a recent thread... http://www.physicsforums.com/showpost.php?p=3567386&postcount=137 ...I posted a formula...
Oct23-11 01:54 PM
PeterDonis
53 5,002
I was wondering if say.. you have a particle moving at 0.5c in the +x direction and a lightbulb at relative rest to...
Oct23-11 08:56 AM
Reikoku
4 1,026
There are quite a number of threads (and FAQ's) that discuss why the speed of light is the "number" that it is, but...
Oct23-11 07:49 AM
Lino
5 1,330
My understanding of the Einstein Summation convention is that you sum over the repeated indices. But when I look at...
Oct23-11 04:56 AM
Phrak
24 2,484
I defined a covering map ℝ^2 → S^1 x ℝ in order to work with the manifold. 1) How can I find lorentzian metrics...
Oct22-11 05:21 PM
honeytrap
0 862
How can one calculate the center of mass of a system made of two photons? I know that they have zero rest mass so the...
Oct22-11 04:38 PM
Matterwave
2 1,810
Hey guys I'm a bit new to GR and stuck on this question? :/. So we are given that: d2xi/dλ2+\Gammaijk dxi/dλ dxj/dλ...
Oct22-11 04:32 PM
Matterwave
1 1,254
I don't think this would ever come up on any of my tests in high school, but how would one answer a question combining...
Oct22-11 01:25 PM
Bill_K
3 859
Set-up #1: A person is enclosed in a container traveling with a constant velocity in the x direction. Wouldn't a...
Oct22-11 01:18 PM
dreamland37
52 7,318
Hey, this is my first post. I am a biology major so I know pretty much nothing about physics, yet sometimes it...
Oct22-11 12:37 PM
harrylin
39 8,533
We've all seen the "ball on a rubber sheet" analogy, showing how warped space near a planet can cause a light beam to...
Oct22-11 11:09 AM
NathanJF
7 2,740
Here's a shorter article for your review. Any errors? ---- I was wondering, how did Albert Einstein figure this...
Oct22-11 10:28 AM
Naty1
1 793
Hi all, I'm currently a stage 1 Physics student at uni; and in the process of learning Special Relativity. I was...
Oct22-11 09:32 AM
Reikoku
2 894
Hi, I'm trying to enter a spacetime with makeg(spacetime_name): on GRTensor II. I'm just following the simple...
Oct22-11 04:33 AM
LAHLH
5 1,789
Hi everybody]Since we see light, from the equation Δt=γ Δt' , Δt' (the Δtime in a photon) should be zero, cause γ→+∞...
Oct21-11 03:02 PM
ghwellsjr
1 892
Saw this in a book last night. I hope I read it right and am remembering it right. If two rectangular coordinate...
Oct21-11 12:49 PM
neginf
3 921
According to Einstein's theory, the fastest speed in this world is the speed of light. lets break this role for a sec....
Oct21-11 09:23 AM
Calimero
8 1,829
Wondering if any of you who are more competent in SR/GR than I am have seen this: ...
Oct21-11 01:20 AM
Matterwave
2 1,394
I'm looking at Einstein's "Simple Derivation of the Lorentz Transformation" http://www.bartleby.com/173/a1.html ...
Oct20-11 11:03 PM
snoopies622
8 1,622
Sorry for yet another time dilation question. I have a couple example problems that I can't seem to explain. 1) A...
Oct20-11 07:40 AM
localrob
9 2,013
I am interested to know what Newton's second law (F=ma) looks like in general relativity. Looking at the geodesic...
Oct20-11 05:15 AM
Phrak
10 1,917
I researched this some, but could not find a method to calculate the radius of the ring singularity in a Kerr black...
Oct20-11 01:18 AM
stevebd1
17 3,696
Basically I want to understand what Rindler observer will see if he looks out the window in direction that is...
Oct19-11 11:37 PM
zonde
2 966
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 10,442
The Oppenheimer Snyder Collapse into a black hole does it happen in finite time for local and remote observers? Does...
Oct19-11 01:20 PM
DrStupid
11 1,918
I'll try to be as specific as possible with my question. From my reading of SR I understand that an object that is...
Oct19-11 04:52 AM
Slinkey
21 2,524
What IS a gravitational degree of freedom? In a non-black hole context? Laura
Oct18-11 02:19 PM
lark
0 862
black, hole Black hole ( 1 2 3 ... Last)
a black hole is first large object until it has enough mass to make it inescapable. Once the black hole accumulates...
Oct18-11 09:14 AM
PeterDonis
284 20,051
There are different notions of locallity for what I know. I mean a property could be really true on neighbourhoods but...
Oct18-11 05:11 AM
bloby
0 796
How do you prove that the energy-momentum tensor is divergence-free? ∂μTμν=0
Oct17-11 10:59 PM
Dickfore
4 2,362
Many short story ideas I have involve space travel. I'm looking at the Lorentz transform formula and scratching my...
Oct17-11 04:05 PM
Slinkey
18 7,160
Okay, I know there is observational evidence for spinning black holes, so therefore I must be confused about...
Oct17-11 12:08 PM
Constantin
6 2,132

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