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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 37,432
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 37,181
I know that it is observed that galaxies and stars thousands and millions of light years away are expanding away from...
Nov28-12 04:46 PM
PeterDonis
4 921
Dear all, This is a continuation of my previous thread, but I figure it's cleaner to start afresh with this topic....
Apr7-13 10:45 AM
NanakiXIII
6 921
Hello friend, Still Something in my mind is saying that Relativity of simultaneity is the reason for time dilation...
Apr6-13 09:29 AM
arildno
13 921
hi. 1. Why does the sign of the metric have to be (+,-,-,-) or (-,+,+,+)? meaning why does the sign in front of...
May23-07 01:08 AM
smallphi
1 920
I have two questions here: 1. As photons have no mass, why does light have a limited speed? 2. When the special...
Apr30-09 12:31 PM
jamesb-uk
1 920
An electromagnetic field, as a plane wave, has a known space-time dependence: E = E0cos(ωt-kx). In a transparent...
Sep27-09 09:29 AM
Bob_for_short
5 920
I saw today in Ohanian's book: "It is convenient to separate particle energies into kinetic and rest mass energies:...
Jan27-10 05:48 PM
DaleSpam
1 920
Ok, I've looked a bit into your Posts. The problem is, I suck at math (i.e. differential geometry). So please tell...
May13-10 01:22 PM
Chris Hillman
31 920
Hello, It's well known that the action for a relativistic point particle is: S=-m\int...
Nov22-10 02:08 AM
raul.cuesta
2 920
Hey guys, I just had a quiz on relativistic energy and there was a question on there that I was sure I got right but...
Mar8-11 09:21 PM
PAllen
5 920
Hi, I am wondering if the cosmological constant is a constant in the sense that it can only have one value, ie some...
Jun23-11 07:01 AM
haushofer
5 920
This is not a question about relativity per se, but relates to it sufficiently I hope. Standard values for many...
Nov17-11 07:35 AM
mes314159
2 920
We know that 1. Mass causes bend in space-time and this is the how gravitation occurs. 2. The formula for...
Jan20-12 10:55 AM
bcrowell
2 920
So Newton says that gravity is an attractive force and some people believe in gravitons to transmit that attractive...
Feb21-13 02:04 PM
Nugatory
6 920
In the Galilean formula u=u'+v, the velocities are bold so we know they're vectors, so for instance if u'=(a,b), and...
Nov1-13 08:00 AM
clem
7 920
Biking at near the speed of light If a biker is going at 0.99c, an observer standing still would notice his...
Mar24-14 07:48 PM
jartsa
38 920
Hi. BHs receive gravity of other stars and then move. Does this mean that information of gravity of other stars go...
Sep10-12 07:31 AM
sweet springs
8 919
This thread is slightly related to another question: http://www.physicsforums.com/showthread.php?t=109211 I was...
Feb4-06 07:30 PM
ZapperZ
1 919
(see attachment)
Mar29-08 12:28 PM
lark
0 919
see the attchments Referring to fig 1 We have a clock that is used to set the time on a second clock. At point A...
Apr3-08 05:09 PM
rab99
4 919
Hello. I've been out of college for 10+ years now, but have never lost the desire to learn more. So I've been trying...
Apr7-09 09:25 AM
Ich
1 919
Does anybody know where I can see the Penrose diagrams for COLLAPSING charged or rotating black holes? Those diagrams...
Sep14-09 09:32 AM
Demystifier
0 919
I apologize for the poorly worded title. Let me try to explain my question better. A scientific theory must be...
Oct19-09 09:06 PM
atyy
4 919
Hi Guys and girls First have very little knowledge of this stuff, but watched a tv program today that made my head...
Dec20-10 02:54 PM
JesseM
3 919
I understand that General Relativity is built on the Equivalence Principle. Apparently there is a approximation to...
Oct14-11 11:08 AM
johne1618
0 919
i dont know this question goes at the right place but i would like to know why speed of light remains constant ...
Apr15-12 08:44 PM
rbj
5 919
this isnt a homework question, incidentally All the foormulas for time dilation, relaitivsitc momentum, do they...
Feb19-06 07:31 PM
gulsen
1 918
Consider a particle that moves with speed V in the positive direction of the OX axis of the inertial reference frame...
Jul27-08 04:29 AM
bernhard.rothenstein
1 918
Is the relativistic mass the reason that objects with mass cannot reach the speed of light? >> The book gave it as...
Jan4-09 02:20 PM
JesseM
1 918
what was the real motive of MM experiment to measure the speed of light or to measure the orbital speed (or speed of...
Aug3-10 07:14 AM
abhi-iitb
6 918
From wiki: 'A "red herring" is a debating tactic that seeks to divert an opponent. A digression can, similarly, be...
Sep25-10 11:14 AM
ClamShell
3 918
Can somebody clarify how the formula for variation of the auxilliary worldsheet metric is obtained due to...
Sep24-11 03:44 PM
Ben Niehoff
3 918
I was wondering if, immediately following the expansion of the universe there might have been objects of matter with...
May16-11 07:59 AM
Naty1
4 918
Hello there! I have a more or less silly and possibly obvious question that's been bugging me a lot. Here's the...
Dec4-13 02:54 PM
George Jones
8 918
has there been done any experiments to find out how electricfieldlines are affected by gravity? What do theory tell us...
Jun7-05 02:20 AM
werty
0 917
I am trying to get my head around some of the basics of relativity. dt' = ydt Where dt is the time between 2...
Mar10-09 10:00 AM
Ich
1 917
Hi, I was reading on special relativity and was trying to understand it. However, I am still not very sure about...
Apr11-10 12:02 AM
Fredrik
3 917
Hi everyone, I found a derivation for relativistic momentum on this page:...
Dec11-11 06:29 PM
DaleSpam
1 917
Actually, this is one of the question I was wondering about. If mathematics allows for wormholes (And there's really...
Sep29-04 03:32 PM
pervect
7 916
Ok, so given two hypothetically identical systems (like two spaceships with identical mass, onboard matter, etc.) am I...
Jul22-11 09:21 AM
atyy
3 916

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