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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 41,642
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 41,288
A hypothetical senario. As velocity increases time slows, time dilation. 2 observers 1 in normal earth time 2nd...
Aug9-11 07:42 AM
DaleSpam
33 3,695
I am not a physicist, so apologies if this is something that has been discussed before and is well understood. I, sort...
Aug9-11 07:18 AM
harrylin
6 2,058
I have only a slight familiarity with classical physics, and in trying to conceptualize time dilation in a more...
Aug8-11 08:45 PM
bcrowell
1 1,319
Like many of these forum dwellers, I've been reading the Elegant Universe and I've hit a fit of confusion. So I've got...
Aug8-11 02:22 PM
drewb
6 1,825
I've just read the FAQ about this and IMO it is "not even wrong" to say that energy conservation doesn't apply to...
Aug8-11 05:40 AM
TrickyDicky
59 5,538
Knowing that a photon can not be at rest, I was wondering what would happen supposing if we travel at the same...
Aug7-11 09:30 AM
ghwellsjr
6 1,559
hello, lets say the there are two bodies that are moving at the same speed of 50% of the light speed and they both...
Aug7-11 08:17 AM
HallsofIvy
5 1,465
SR leans more toward direct observation rather than explanation, which is fine, mostly resulting from experiments with...
Aug6-11 10:43 PM
GrayGhost
12 1,538
In Schutz book, A First course in GR page.11 eq. 1.2 ...
Aug6-11 03:43 PM
TrifidBlue
6 1,137
I remember reading an article that said essentially that the point of reference and the number of "space structures"...
Aug6-11 10:57 AM
NBagley119
9 1,421
what would Rabcd;e look like in terms of it's christoffels? or Rab;c
Aug6-11 06:26 AM
dextercioby
11 2,864
When the an object is accelerated and when the velocity approaches the speed of light, its mass increases...
Aug5-11 03:37 PM
DrGreg
5 1,034
In a previous thread someone pointed me to DH's FAQ article on the Rest Frame of a Photon. In the article DH states,...
Aug5-11 11:40 AM
rede96
60 4,677
This is something that has always bugged me about relativity... I must be missing something.... Lets say you have a...
Aug5-11 08:05 AM
Doc Al
4 1,199
General relativity states that our universe is four dimensional curved space so time dimension is not separated from...
Aug5-11 05:12 AM
harrylin
45 7,206
I’ve been looking at the Wikipedia article on affine connections with a view to better understanding the choice of...
Aug5-11 02:06 AM
Goldbeetle
8 1,568
Pair-production is the event when a particle and anti-particle is created from a single photon. We don't see 2 or more...
Aug5-11 12:20 AM
kannank
17 2,151
Hi, I just started reading "The Elegant Universe" as an introduction to physics. Up to this point I thought I...
Aug4-11 10:10 PM
DaveC426913
5 1,004
If photons emit gravitons, then where does this energy come from? It cant pull it from its kinetic energy or maybe it...
Aug4-11 09:14 PM
cragar
16 3,625
Most of what I've learned about Special Relativity is self taught using Google and Wikipedia because I'm still in high...
Aug4-11 11:41 AM
Fredrik
4 1,718
We all realize time dilates in a gravitational potential. Is there any evidence to suggest there is time dilation in...
Aug4-11 11:19 AM
H_A_Landman
23 5,236
moving Moving at c ( 1 2 3 ... Last)
I'm a relative newbie to relativity (no pun intended -- I know you've heard that one too many times), as well as to...
Aug4-11 10:18 AM
PAllen
58 4,006
I'm trying to use the equations on this page and I have solved the following. Is it correct? ...
Aug4-11 03:54 AM
randombill
1 1,676
In order to explain the relativistic nature of magnetism, a book shows an example of linear procession of charges:...
Aug4-11 01:38 AM
cragar
1 1,408
On my blog, I am having a continuing discussion on special relativity with another person (we are both amatuers). We...
Aug3-11 09:38 PM
DaleSpam
83 7,194
Can frame dragging around a black hole induce closed timelike curves (CTC)?
Aug3-11 07:56 PM
Chalnoth
9 1,990
can twin paradox be solved,if no, what r the difficulties scientist face to solve it?? or is there a solution on it.
Aug3-11 01:17 PM
pervect
2 1,054
Who’s “spin” is in the Einstein-Cartan theory? Source’s spin or the test particle’s spin? I quantum mechanics, when...
Aug3-11 12:21 PM
tom.stoer
3 1,315
I have been trying to figure this one out for some time now. I have read much on the subject, but it seems to be dealt...
Aug2-11 10:20 PM
ccm.student
163 36,241
can you construct (or if yes, is it regularly done) a Hamiltonian in curved spacetime? If you took a system and moved...
Aug2-11 06:06 PM
dextercioby
2 812
when we move with light our time is slower and when we move against it then it's slower but what if we move at 99%C in...
Aug2-11 04:11 PM
harrylin
94 9,630
If maths tells us 1 * -1 = -1 and it takes a positive cell to repel a positive cell ..... could in theory a...
Aug2-11 11:36 AM
Vanadium 50
11 1,422
I do not understand if you accelerate a hydrogen atom to 90% the speed of light its mass is greatly increased. Are...
Aug2-11 11:03 AM
DaveC426913
8 2,006
I understand that matter and energy bend space time, yet i am curious as to the level at which it requires to bend it....
Aug2-11 10:57 AM
rationalist76
3 1,860
1) Is it always a given that the spacetime curvature will be flat in a region in which there is no mass? 2)...
Aug2-11 10:25 AM
Bill_K
4 1,279
a situation of twin paradox one twin alice is moving with 99%C another john is at rest on earth this means 1...
Aug2-11 09:18 AM
ghwellsjr
6 1,098
I was reading something about the Cartan (vierbein) formalism in GR, in wich the connection is allowed to have...
Aug2-11 09:03 AM
dextercioby
3 1,048
If a bacteria was travelling through space at the speed of light would the cells divide at a constant or relative...
Aug1-11 11:20 PM
rationalist76
3 1,045
how is twin paradox resolved in case of no/zero acceleration/deceleration? two twins one on earth and other on a...
Aug1-11 01:20 PM
D H
131 10,921
There is no clock that will measure time independently of movement. And conversely, nothing ever happens that does not...
Aug1-11 10:52 AM
time_nerd
104 8,674

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