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Mar11-14 10:20 AM bcrowell 

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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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Feb23-13 08:40 AM
ZapperZ
1 37,494
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 37,229
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 1,919
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 1,039
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 1,170
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 1,975
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 4,392
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
4 954
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 1,204
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 2,255
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
0 824
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 1,662
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 1,099
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
3 800
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 6,919
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 7,597
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 2,610
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
1 678
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
2 822
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 1,657
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
1 836
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
3 839
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 1,716
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 1,267
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 1,495
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 1,826
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 1,746
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 3,251
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
2 892
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 9,226
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 1,696
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 2,278
What IS a gravitational degree of freedom? In a non-black hole context? Laura
Oct18-11 02:19 PM
lark
0 772
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 17,898
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
0 750
How do you prove that the energy-momentum tensor is divergence-free? ∂μTμν=0
Oct17-11 10:59 PM
Dickfore
4 2,194
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 6,457
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 2,051
In GR there is made a clear distinction between a vacuum region and a non-vacuum region as one is handled by the Ricci...
Oct17-11 10:01 AM
Bill_K
1 1,059
Pls I NEED HELP ON MY MASTERS PROJECT. I NEED INFORMATION ON HOW TO COMBINE GENERAL RELATIVITY AND...
Oct17-11 08:22 AM
HallsofIvy
1 1,015
Hi, I am curious whether that when the Earth is in its closest position to the Sun, the Suns gravitational pull...
Oct17-11 08:18 AM
D H
2 1,360
Hi, I had a question on theory of relativity. It is more of a thought experiment. As per the theory of relativity,...
Oct17-11 02:40 AM
ghwellsjr
3 1,200

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