Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

1 
37,495 
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

0 
37,231 
Lets assume I create a spaceship that is powered by vacuum energy which gives the spaceship an unlimited fuel supply. ...

Mar308 04:39 PM
jtbell

17 
4,383 
I remember reading somewhere that some time after Schwarzschild came up with the black hole solution to GR that...

Mar308 04:17 PM
blp

0 
1,967 
According to Wikipedia, if the metric was vacuum, spherically symmetric and static the Schwarzschild metric may be...

Mar308 03:20 PM
blp

4 
1,232 
I recently read Einstein's book explaining SR and GR for general readers.
Though it was simple, at one place, while...

Mar308 02:28 PM
mitesh9

19 
2,669 
I do not see why it is not. I believe relativity is a gauge theory, due to the spin connection on a so(1,3) principal...

Mar308 05:37 AM
Mentz114

1 
2,250 
Hello! Can anyone help me with the following question about black holes?
Let us consider a massive star which at...

Mar208 04:25 PM
ryanedwards

4 
1,446 
Inside a spherical cavity centered at the earth's center, is the spacetime curvature is 0 or not 0? Would the clock...

Mar208 01:24 PM
A.T.

13 
1,977 
Can you go so fast that after say one second, light has traveled less than a planck length further than you did (with...

Mar208 10:17 AM
Fredrik

16 
3,248 
The parallel transport equation is
\frac{d\lambda^{\mu}}{d\tau} = \Gamma^{\mu}_{\sigma\rho}...

Mar208 08:12 AM
jostpuur

1 
1,549 
What ive learned is that when going at a fraction of C, the energy put into the acceleration is transferred into mass....

Mar208 06:40 AM
DaleSpam

6 
3,104 
Hey everyone. This is my first post, and I apologize if my question is too stupid for this forum.
I bought Steven...

Mar208 03:36 AM
CompuChip

9 
1,493 
Has anyone seen this identity:
g^{ab}\nabla g_{ab}=\nabla lng
I've seen it used, but want to figure out where...

Mar108 11:30 PM
robousy

11 
3,680 
What two speed measurements do two observers in relative motion always agree on?
In my opinion, one will be...

Mar108 09:51 PM
robphy

9 
2,264 
Hi;
I am trying to find the geometry of a nearextremal D3 brane. I have been told that this geometry is the same as...

Mar108 06:01 PM
Pacopag

4 
1,536 
Hello
I was just wondering how, if a wormhole were possible such that one could travel from point A to point B...

Mar108 04:22 PM
George Jones

1 
2,463 
I have read the derivation of time dilation by using a lightclock, but I can't seem to find an argument that shows why...

Mar108 02:15 PM
tinytim

3 
3,167 
Consider three clocks A,B and C all set at t=0 at t=0
Clock A is stationary on earth
Clock B is on a rocket...

Mar108 09:27 AM
JesseM

5 
3,357 
. They understand the classical Schwarzchild radius argument for black hole formation. They have bare rudiments of...

Feb2908 12:36 PM
marcus

14 
3,378 
I was working a problem in a Modern Physics book:
Find the momentum (in MeV/c) of an electron whose speed is 0.600c....

Feb2808 07:39 PM
JesseM

3 
7,999 
I am in college and have no formal training in physics, but i really enjoy the field. I was reading about redshift and...

Feb2708 03:39 PM
James23

20 
2,480 
Would the pressure and the gravitational selfenergy of a body contribute to both its gravitational mass and its...

Feb2708 03:34 PM
Xeinstein

0 
741 
I would like to preface this idea by stating that I am a total noob and in no way have any right to be here haha.
I...

Feb2708 03:15 PM
JesseM

7 
1,473 
In the space of Riemannian metrics Riem(M), over a compact 3manifold without boundary M, we have a pointwise (which...

Feb2708 02:19 PM
olgranpappy

1 
1,478 
Selleri proposes the following transformation equations
x=g(x'vt')
t=t'/g
g=gamma.
Einstein's clock...

Feb2708 12:05 PM
DrGreg

10 
2,418 
I read somewhere that relative speed of light always remains constant. That is there is no difference between relative...

Feb2708 10:05 AM
robphy

12 
1,398 
Hi there
I have a question that has possibly been covered before, however, I cannot find the answer that I seek in...

Feb2608 08:02 PM
Joanna Dark

50 
5,457 
Just out of curiousity, what's wrong with the theory that the aether is attached to the earth? It's no more fantastic...

Feb2608 04:46 PM
1effect

12 
1,635 
If the Ricciscalar R is constant for a given spatial hypersurface, then the curvature of that region should be...

Feb2608 03:58 PM
Mentz114

1 
1,567 
Please tell me if "conventionality of dimultaneity" and "Einstein clock synchronization" are one and the same thing?...

Feb2608 12:15 PM
DrGreg

4 
1,531 
I'm embarrassed to ask, but I think this will save me some time...
I'm trying to use the condition...

Feb2608 12:02 PM
DrGreg

4 
1,449 
My current understanding of the components of the symmetric stressenergy tensor used in the Einstein Field Equations...

Feb2508 12:02 PM
shalayka

0 
1,135 
Imagine we have two rockets, each with a long cylinder with it spin axis alligned with the long axis of the rocket. On...

Feb2508 06:01 AM
allebone

27 
4,258 
Hi, I brought this up in physics class a while ago but didn't get a very satisfactory response...
A train moving at...

Feb2508 05:53 AM
tinytim

4 
2,478 
So I'm introducing myself to formulas and such. I just am going over time dialation and the Lorentz factor. ...

Feb2508 12:35 AM
1effect

5 
1,727 
Hello, I am in the process of reading Black Holes, Wormholes & Time Machines and am somewhat confused, even though it...

Feb2408 11:23 AM
_Mayday_

5 
2,169 
If two black holes with equal mass and angular momentum, but the latter in opposite directions were to collide, they...

Feb2408 07:55 AM
xantox

3 
1,698 
Theory of Relativity says nothing can exceed the speed of light. My question is:
Can any information be made to...

Feb2308 07:38 PM
yuiop

5 
2,942 
I'm just wondering, what mathematics would be required to learn GR? If I'm not mistaken, SR only requires algebra, but...

Feb2308 04:58 PM
darkSun

2 
1,048 
I have read a number of threads on acceleration and special relativity, but can't find what I'm looking for. I would...

Feb2308 02:58 PM
DaleSpam

10 
2,020 
I have just read the "Read Before Posting" sticky thread and am wondering. Relativity is a difficult theory to...

Feb2208 12:54 AM
chroot

46 
3,689 