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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 37,402
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 37,161
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
3 798
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 6,908
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 7,564
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 2,604
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
1 675
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
2 820
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 1,654
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
1 833
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
3 834
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 1,709
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 1,266
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 1,491
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 1,822
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 1,742
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 3,243
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
2 891
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 9,194
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 1,689
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 2,273
What IS a gravitational degree of freedom? In a non-black hole context? Laura
Oct18-11 02:19 PM
lark
0 768
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 17,831
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
0 744
How do you prove that the energy-momentum tensor is divergence-free? ∂μTμν=0
Oct17-11 10:59 PM
Dickfore
4 2,184
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 6,441
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 1,056
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 1,008
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 1,354
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 1,198
Hi! Need some help with this that's been plaguing my brain. :smile: Hypothetically, if an object's speed were to...
Oct17-11 02:33 AM
harrylin
1 1,080
I have just a quick question I was wondering about and I was wondering could someone answer it here. Is it true that...
Oct17-11 12:19 AM
yoron
23 1,749
Can somebody explain a little bit about how to actually use Einstein's field equations to solve for particle...
Oct16-11 08:18 PM
jfy4
1 1,270
To avoid confusion, I'm talking about: "A flash of light is given off at the center of the traincar just as the two...
Oct16-11 08:03 PM
yoron
11 1,669
A long spaceship with a clock C1 at the front and a clock C2 at the rear is moving at a uniform velocity wrt to earth...
Oct16-11 07:05 PM
Petyab
7 2,610
In high school, doing modern physics, and was struck by a thought about light, energy of a photon and the "speed...
Oct16-11 06:59 PM
yoron
9 1,910
Hi everyone! I'm really sorry to bother you with my surely stupid questions, but I am 13 years old and today I read...
Oct16-11 06:23 PM
yoron
5 1,520
I had a quick look through the topics and I can't seem to find a thread that already addressed this question, but if...
Oct16-11 06:55 AM
Slinkey
18 2,086
What is time??
Oct15-11 08:47 PM
ZapperZ
95 7,115
Galilean space-time renounces that use of co-ordinate systems such as x3 and t1 because comparing two space-time...
Oct15-11 07:07 PM
Vanadium 50
1 1,283
I've done a little diagram to hopefully represent my question. I've represented three different sources on three...
Oct15-11 06:28 PM
gonegahgah
27 2,093

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