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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
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 41,904
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 42,265
This is a diversion from the "Interesting energy problem" thread. That thread lost its direction a bit lost due to...
Jul7-11 03:39 PM
Q-reeus
15 2,223
I don't know if I am posting this in the right section, I am still figuring these boards out. Could someone explain...
Oct6-05 08:02 PM
robousy
10 3,240
I know that folding spacetime is completely possible, and i'm pretty sure that the answer i'm looking for is in...
Jul8-10 07:13 PM
bcrowell
3 3,627
Hi all, I began to read this paper :cosmology On page 9 the author foliates spacetime into spatial hypersurfaces, ...
Apr10-09 01:17 PM
naima
2 735
Hello, Anyone has figure or web site which illustrates how foliation of space time hypersurfaces look like or what...
Jan12-11 04:58 PM
berkeman
20 3,680
Isham wrote: http://arxiv.org/PS_cache/gr-qc/pdf/9310/9310031v1.pdf When we come to a Diff(M)-invariant theory...
Dec22-11 10:51 AM
exponent137
10 2,066
I'm familiar with how one foliates, say, a four-dimensional spacetime (\mathcal{M},g) so that one can identify it as a...
Dec20-06 02:04 AM
coalquay404
6 2,351
Here goes a conceptual question that has been bugging me: Consider the famous eclipse experiment that shows the...
Nov23-13 08:25 AM
Naty1
28 1,440
I've been reading Melvin Schwartz's mostly excellent book, Principles of Electrodynamics. He has a section on...
Dec19-07 09:29 AM
GreenPenInc
3 1,214
Is there a way to define via Geommetry or other concept the quantities we call "Force" and "potential"?..in the same...
Sep5-06 02:11 PM
pervect
5 3,734
Hello When I had relativity course and I read some books and sources like : Rindler W. Relativity.. special,...
Sep22-09 01:21 PM
javierR
3 774
1.) The tests of falling bodies in a frame under constant acceleration prove all masses accelerate to the floor at the...
Apr23-08 08:40 AM
Chrisc
18 2,432
Hi, Does the magnitude of the force change when the frame moves with a high speed with respect to another frame at...
Aug13-13 02:47 AM
harrylin
6 617
Say we have identical masses side by side low down in a strong gravitational field. We attach ideal massless cords to...
May31-12 04:37 PM
PeterDonis
18 2,372
Lets start over and let me rephrase my question, a force due to gravity permeates the area around it with time...
Oct18-10 05:21 PM
pervect
28 2,300
When considering the Newtonian forces, it's somewhat intuitive to think about the equilibration of forces, e.g. two...
Jul7-12 09:49 AM
Bill_K
2 674
Well what is the apparent force applied on two bodies of mass m1 and m2 due to Cosmological Constant? First of all,...
Apr22-10 02:44 PM
bapowell
1 994
Hi... Please can anyone explain me why we can talk about force in special relativity? I thought that special...
Feb15-07 06:31 PM
rbj
6 1,893
In SRT, Force (F) transforms identically to d(mV)/dt, which can in turn be transformed using the Lorentz...
Jun24-11 10:22 PM
pervect
5 838
The Lorentz force transformation (or the transformation of d(mv)/dt) is well known. Should all force laws (Hooke,...
Feb6-10 09:28 AM
GRDixon
2 1,162
How can we calculate force of gravity between two objects using Einstein's relativity theory. Using Newton's method we...
Mar29-12 06:14 PM
pervect
2 875
Can a massless classical particle experience a nonzero Newton's second law force? Dickfore produced a very...
Jul15-11 07:38 AM
atyy
11 1,242
Okay because my previous post of similar kind was I guess rather too full of thought experiments and ideas that nobody...
Aug21-13 04:08 PM
Simon Bridge
5 704
Consider some material object, more or less rigid, with two ends, A and B, like A---B It is at rest at a point...
Dec27-07 06:07 PM
pervect
5 1,995
I know that there is an equation for an accelerating object that is already a notable fraction of the speed of light...
Nov2-13 12:01 AM
pixelpuffin
8 915
Difficult to explain this question but i will try, Space is expanding and un gravitationally bound matter is carried...
Feb18-05 10:55 AM
chronon
26 3,780
Maybe this should be in the classical physics section, but there is a connection with GR so I'm posting here. I've...
Sep2-08 08:24 PM
Mentz114
15 2,092
I am thinking about train paradox here. The only difference between the passenger and the person waiting at the...
May21-11 11:38 PM
ZealScience
3 1,024
Consider two point charges in space: one positive(+Q) and other negative(-Q), lying on the y-axis and separated by...
Jul4-11 10:02 AM
lovetruth
59 6,047
Does anyone have any references in the literature that talk about interpreting forces as Christoffel symbols? ...
Dec11-11 10:54 PM
atyy
10 1,805
To avoid hijacking an existing thread, I wanted to start a new one on how "gravitational forces" are represented in...
Jul29-12 07:39 AM
Mentz114
34 2,391
Let's tie a rope on an object, then we swing the object around in a circle, then we start running forwards while...
Oct27-13 07:07 AM
DaleSpam
66 12,737
I was wondering why can't I use formulas from the "Special Relativity" in cases like: F=mv^2/r Or F=qvB...
Jul22-14 12:56 AM
ghost313
2 687
I am attemting to help my son with a Physics problem, and it has been 20 years since my last Physics class. I would be...
Feb9-04 06:49 PM
Bigniko
0 1,307
In my general relativity class my professor derived the form of the Kruskal-Szekeres form of the Schwarzschild metric...
Oct19-12 02:25 PM
Airsteve0
2 1,040
This is a fairly trivial question I think. I'm only asking it here because after some googling I was unable to find...
Aug14-12 07:26 PM
LittleSailor
3 904
Considering how the various forms of equivalence principle can lead to ambiguous discussions, I would like to know if...
Jan15-07 10:24 AM
Crosson
3 1,768
i am read a paper of name: "formalism for an extended object"(in spanish).. a sub manifold of coordinates y^i...
Nov18-09 05:11 PM
alejandrito29
2 798
Does anyone have any information on this experiment involving Einstein's prediction of the speed of gravity? Was it...
Feb6-07 07:40 AM
Satie
35 3,972
Hello; I know that the formula for density is mass/volume. However, this is only true for rest mass. What about...
Mar17-10 02:44 AM
FeDeX_LaTeX
4 1,348

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