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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 42,469
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 42,118
Suppose we have a box at rest that is filled with a uniform gas. We denote the volume by V and the pressure by p....
Jun1-08 12:18 PM
pmb_phy
89 13,323
If we add a third observer to the twins paradox at the turnaround point (at rest with earth), and with a clock that...
Jun1-08 06:22 AM
Al68
4 1,301
I have ben doing some reading on general relativity but I can not find an answer to my question. If a curved 2-D...
Jun1-08 02:38 AM
gravity guru
6 1,486
general relativity says that gravity and acceleration produce the same effects but when an object accelerates its...
May31-08 04:29 PM
yuiop
22 2,610
Simple question (derived from some unanswered posts from various posters, mostly mitesh9)... Two identical clocks A...
May31-08 08:51 AM
yuiop
96 8,524
Apparently a moving rod shrinks. What are the measurements of two moving parallel train tracks?(2 vertical tracks...
May31-08 06:03 AM
Doc Al
1 921
I'm new to educating my self on this field by reading..but i have a question. if you are approaching the speed of...
May30-08 09:43 PM
CJames
13 2,290
According to the Wikpedia entry http://en.wikipedia.org/wiki/Bell's_spaceship_paradox and this paper...
May30-08 06:14 PM
Wizardsblade
104 13,244
Andromeda Paradox
May30-08 12:36 PM
paw
1 1,647
Suppose one twin travel to a distance L and turn around, another twin travel to a distance L/2 and turn around. When...
May30-08 10:16 AM
kahoomann
12 2,098
Prove that 4 vector potential does really a 4 vector? Most of the textbooks I found only mention that divergence of 4...
May29-08 09:33 AM
pmb_phy
59 13,721
any body can give me some material about Palatini forms of GR please, thank you!
May29-08 05:18 AM
xiaomaclever
0 1,069
From Bergmann chapter 8.Please show that (see at Fig. below)....thank you.
May29-08 03:54 AM
supakorn
3 1,158
Hi, I understand that EM fields have energy and they travel at c. Light is an EM field so it travels at c as well....
May28-08 11:39 PM
worwhite
9 1,219
Can someone tell me how much does a light ray bend when it passes over the surface of the densest star known? Is...
May28-08 05:16 PM
Ulysees
2 4,681
Please tell me if it is possible to derive the formula which accounts for the Lorentz contraction from the invariance...
May28-08 12:19 PM
DrGreg
30 8,698
Quite often the explanation to the twins paradox is stated as acceleration breaks the symmetry or one twin feels...
May28-08 11:12 AM
RandallB
63 5,771
Hi All, Can someone tell me what is meant by time & space being "continuous" as opposed to "discontinuous"? What...
May28-08 07:09 AM
flatguy
13 4,496
This is still rather new to me so please pardon my ignorance. My introduction to tensor differentiation involved only...
May28-08 04:46 AM
snoopies622
12 4,742
If I want to consider the velocity of distant receding galaxies which may be receding at velocities close to the speed...
May27-08 11:08 PM
duordi
6 1,325
I have been roaming around threads on PF and there are certain things on which there is no consensus. I would...
May27-08 03:07 PM
RandallB
21 2,485
Based on the quote below and the link to Wikipedia, I believe the implication is that gravitational redshift will...
May27-08 11:11 AM
mysearch
70 7,955
Can a 4-dimensional manifold with the Schwarzschild metric be embedded into a flat manifold of 5 (or more if...
May27-08 10:14 AM
shoehorn
14 1,974
Hey I have done a few google searches, and I do not have a relativity book to let me know what the equation for time...
May27-08 10:09 AM
shalayka
12 2,507
Is there any free online tutorial which completely explains General Relativity without concept of Tensors?
May27-08 09:22 AM
pmb_phy
2 3,755
Trying to understand black holes as much as possible without the difficult math.... I gather that matter - or...
May27-08 04:26 AM
HarryWertM
0 1,030
1. How would a general relativist explain why an object falls towards the earth? 2. Is it correct to say that it is...
May27-08 04:22 AM
cristo
4 1,430
This is related to this thread here. To make responding easier, I have marked questions in red. I have tried to...
May27-08 02:00 AM
neopolitan
8 1,912
I'm curious about how people here view Einstein's prescription for determining simultaneity in an inertial frame, and...
May27-08 12:26 AM
Ken G
152 17,542
Since SR physics has considered motion strictly as the separation of bodies, no longer can a body move through space...
May26-08 07:48 PM
Chrisc
45 3,046
Hi, I am not exactly sure how to present this question. Even thinking about it creates some confusion,so I will...
May26-08 07:18 PM
tiny-tim
1 4,703
(This is probably answered somewhere, but I couldn't find it, I'm kinda new. >_>) So, say I was able to travel at...
May25-08 04:26 PM
pmb_phy
9 3,980
What is the meaning of the curvature scalar (R) in GR? More precisely, what is the meaning of it's evolution? Why when...
May25-08 04:02 PM
pmb_phy
11 2,778
Doran/Lasenby define a proper interval as: \delta \tau = \int \sqrt{\frac{dx}{d\lambda} \cdot...
May25-08 11:13 AM
Peeter
8 2,372
Hello. If you were far away from a small black hole, and shot (for the sake of argument a bullet) with such precision...
May25-08 10:51 AM
Jorrie
12 2,174
relativity LC=length contracted or length contraction TD=time dilated or time dilation LOS=loss of simultaneity ...
May25-08 01:28 AM
granpa
0 1,369
We know what is twin paradox is, and also why it is not a paradox, but my question is, "if we can not define absolute...
May24-08 10:16 PM
Al68
124 10,045
The wave-frequency relationship is as follows: f = v / \lambda Therefore: v = \lambda * f The de Broglie...
May24-08 10:16 AM
lbrits
8 1,471
suppose we have a stationary observer 'A' at the origin. at t=0 rockets 'B' and 'C' pass the origin moving at...
May24-08 08:50 AM
DaleSpam
1 1,110
(This could be a dumb question, but in any case I'll be happy if the answer is simple) I understood that the path...
May24-08 05:51 AM
jostpuur
3 1,185

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