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

Dec3107 02:06 AM
jtbell

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42,119 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

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42,470 
Does general relativity allow nested event horizons?

Nov1906 10:01 PM
Loren Booda

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3,361 
:rofl: Discussing with a friend, I was told that using in a derivation the time dilation formula I implicitly use the...

Nov2006 11:14 PM
bernhard.rothenstein

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2,462 
Dear all,
I would like to know about a possible plane Schwarzschild geometry.
This would be the analog of a...

Nov2106 12:17 AM
Chris Hillman

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1,932 
From all the sources I have (and including wikipedia), it seems that the speed of light is lowered by the presence of...

Nov2106 12:39 AM
notknowing

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3,837 
In any textbook on relativity, one finds the classical expression for the stressenergy tensor of a perfect fluid. In...

Nov2106 01:35 AM
notknowing

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3,721 
According to the Unruh effect, an accelerating observer will find himself surrounded by a "warm bath" of particles...

Nov2106 02:08 AM
notknowing

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1,729 
Einsteins field equations are nonlinear. One could interpret this to mean that curvature is itself the source of...

Nov2106 02:31 AM
Chris Hillman

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2,533 
I'm new to the physics forums so correct me if I'm in the wrong place. We started a new unit on universal gravitation...

Nov2106 03:49 AM
Chris Hillman

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1,487 
From an ongoing discussion here, a new question comes to me.
Is there a known generalisation of the Schwarzschild...

Nov2106 04:06 AM
Chris Hillman

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3,871 
What are their differences?
Spatially homogeneous is when there is uniform composition of space
Spatially...

Nov2106 05:11 AM
Chris Hillman

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8,890 
Once again, hello to all !:smile: ,
I'm back with another quick question ...
Can you explain or redirect me to...

Nov2106 06:17 AM
Chris Hillman

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2,210 
Hello there!
Am actually doing my end of year project on GPS and GR. It's actually a review of Ashby's work. I am...

Nov2106 08:15 AM
George Jones

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2,288 
Is the reason why the Lorentz transformations form a group because of the reason on this website ...

Nov2206 01:08 AM
dextercioby

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2,500 
The Rindler geometry and its horizon can be obtained by a simple succession of Poincaré transformations to match the...

Nov2206 05:16 PM
Chris Hillman

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2,869 
This may be a repeat, but I don't think the earlier shorter post survived the recent PF upgrade, at least I couldn't...

Nov2206 07:12 PM
Chris Hillman

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1,452 
I know that gravitational energy is a delicate topic in GR. It is true that the localisation of gravitational energy...

Nov2206 07:24 PM
Chris Hillman

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3,632 
Gravitational waves are usually associated with powerfull events (stars, black holes, etc.) but I just wonder if they...

Nov2206 07:54 PM
Chris Hillman

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2,076 
Assuming LISA does find graviational waves in the future, is there any way in theory to focus these gravitational...

Nov2206 08:37 PM
Chris Hillman

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1,601 
I'm wondering if event horizons can exist in shapes other than perfect spheres (for instance, if the object has...

Nov2206 09:09 PM
Chris Hillman

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1,891 
Hi All, I was hoping someone could help point me in the right direction. I'm interested in simulations of General...

Nov2206 09:18 PM
Chris Hillman

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1,529 
Hello to all,
Could someone give me a link that would point me towards a description of the inner workings of the...

Nov2306 05:14 AM
notknowing

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1,243 
I understand why it is so desirable to be able to write all the laws of physics by the same rule in any system of...

Nov2406 09:56 AM
RandallB

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1,455 
Hello, folks  here is a question that I have been pondering for about 20 years.
As I understand it, the...

Nov2406 10:22 AM
Lelan Thara

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2,986 
I have heard that if one is hypothetically placed in a box completely solid, whith a shield that leaves everything...

Nov2406 02:36 PM
RandallB

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1,361 
A short question this time :
Is the gravitational length contraction an effect which acts parallel as well as...

Nov2506 07:39 PM
pervect

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2,918 
Hello, I have just registered in the forum!
I am a shool student, who is generally inerested in Physics and...

Nov2506 10:58 PM
bernhard.rothenstein

10 
1,993 
http://www.physicsforums.com/showthread.php?t=144296
which turned into a discussion of the various kinds of mass in...

Nov2606 01:06 PM
pervect

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2,568 
I've done college courses on both & it's not clear yet how they conflict. I'm looking for a more technical account....

Nov2706 03:25 AM
dextercioby

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2,669 
Here's something for the phone book's fans to chew on:
Surprisingly, on page #1278, in the index entry "Torsion",...

Nov2706 04:24 PM
Chris Hillman

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1,007 
Einsteins field equations are nonlinear but I guess that nobody has already found solutions to the full nonlinear...

Nov2706 04:48 PM
Chris Hillman

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6,287 
hi:
Using gr and with great idealizations he discovered that the surface of imploding stars, viewed by a static...

Nov2706 05:18 PM
Chris Hillman

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1,823 
Whenever there's no acceleration then: (Geodesic equation)
\nabla _{u} u =0
where the covariant derivative...

Nov2706 05:37 PM
Chris Hillman

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1,436 
The stress energy tensor of a perfect fluid is composed of two terms of which only one term contains the metric tensor...

Nov2706 06:09 PM
Chris Hillman

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6,364 
Perhaps gravity is not spacetime curvative, and background independence not needed, and spacetime is infinitely...

Nov2706 08:22 PM
bananan

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929 
Hi.Recently,my friend told me that time travel is suppose to be phenomenon.I don't how this could happen.She wrote...

Nov2706 08:47 PM
kindaichi

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2,022 
Hi, sorry if this is a frequently asked question.
I was reading up on black holes with electric charge and I was...

Nov2706 09:03 PM
Chris Hillman

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2,214 
In another thread, Nerid mentions
The Magnetospheric Eternally Collapsing Object (MECO) Model of Galactic Black...

Nov2706 10:04 PM
Chris Hillman

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1,191 
I understand it is always possible to diagonalize a metric to the form
diag
at any given point in spacetime...

Nov2706 11:18 PM
Chris Hillman

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3,486 
Does a rappidly spinning mass experience an effect in GR that is equivalent to mass dialation in SR? I so, would it...

Nov2806 12:30 AM
Chris Hillman

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2,155 
How can I obtain a Kerr metric by using the Einstein equation?

Nov2806 02:28 AM
Chris Hillman

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4,519 