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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 41,673
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 41,318
Suppose you were to board a ship on Earth departing for a star system 1,000 light years away. You accelerate at 1g...
Apr18-14 03:06 PM
Camel_City
2 311
Light can be affected by gravity and as I understand it light can be a source of gravitational effects on other...
Apr18-14 01:19 PM
PAllen
18 1,178
Lately, I have been giving a lot of thought to whether or not photons would have mass or not. I know most on here an...
Apr18-14 09:42 AM
Andrew Mason
14 925
In Steven Weinberg "gravitation and cosmology principles and applications of the general theory of relativity"...
Apr18-14 09:27 AM
nenyan
0 318
Hi, this might be a silly question, but it does confuse me when I read about general relativity. From what I know...
Apr17-14 12:10 PM
jtbell
2 417
Im reading about Coulombs law in my textbook. It states that: "The forces between to charged particles are...
Apr17-14 10:47 AM
UltrafastPED
1 315
This has bothered me for a long time. I understand that time varies with velocity relative to the observer. But what...
Apr16-14 06:33 AM
Nugatory
9 472
Suppose a black hole travels at something like v = 0.999999999c relative to some observer. Does the black hole's event...
Apr16-14 04:46 AM
martinbn
6 491
In another thread Wannabenewton mentioned: and gave this reference: Until WBN mentioned it, I had never given...
Apr16-14 01:44 AM
WannabeNewton
199 9,841
Hello everyone. Thought of this question while at work. I've read the universe appeared out of nothing and expanded...
Apr16-14 12:08 AM
Mordred
9 407
Hi, I know there are already other posts about extremal aging, but all of them are actually closed and none of...
Apr15-14 04:57 PM
RiccardoVen
6 407
Hello, Im interested in surface gravity of Kerr black hole it means, I need to find killing vector for Kerr which...
Apr15-14 09:33 AM
Vrbic
2 383
Hello, all. I've been attempting to understand relativity the past week. I've also been reading about quantum...
Apr15-14 02:06 AM
bhobba
5 471
So, there's a paper here that I'm a bit confused about. On pages 3 and 4, it talks about energy density magnitude and...
Apr14-14 08:22 PM
MattRob
0 424
If I am not mistaken, the change of the minkowski metric to: n_{\mu\nu} \rightarrow g_{\mu\nu}(x) will violate the...
Apr14-14 08:10 PM
Geometry_dude
4 336
"... Supposing that the bodies act upon the surrounding space causing curving of the same, it appears to my simple...
Apr14-14 04:13 PM
DaleSpam
10 610
I have a question on the tension between special relativity and quantum mechanics, so please correct the category if...
Apr14-14 04:03 PM
DaleSpam
17 872
I'm starting with the Einstein box. It's the one that's floating in space and has photons moving from one side to the...
Apr14-14 08:48 AM
UltrafastPED
17 663
Hi Bear with my possible ignorant. I am puzzled over this dilemma. If General Relativity states that gravity is the...
Apr14-14 07:27 AM
Mordred
5 411
My question is the following: Have there ever been any experimental tests of the Einstein equation (a.k.a. Einstein...
Apr13-14 05:33 PM
Geometry_dude
2 374
Suppose that you have a region of space with no fields and the only matter is in the form of a cloud of point-masses....
Apr13-14 11:54 AM
WannabeNewton
2 399
... I gained most of my elementary understanding of Special Relativity (SR) from books by Isaac Asimov. I made the...
Apr13-14 09:14 AM
Wes Tausend
29 1,288
This came up while I was trying to research the interaction of an electromagnetic plane wave with a dielectric slab,...
Apr12-14 04:16 PM
universal_101
2 313
Someone on another forum shared with me that a 6L6 vacuum tube exhibits a blue dot when in operation that is supposed...
Apr12-14 01:44 PM
nsaspook
2 404
Hello everyone, I have recently read a puzzling statement on my Electromagnetism (Chapter on Special Relativity)...
Apr12-14 11:45 AM
Zag
15 547
Neat "rubber sheet" analogy of the curvature of space time on YouTube. Skip to 5:57 for orbits around the Earth moon...
Apr11-14 02:46 PM
A.T.
1 382
good day , I am not a professional , but I read that in according to laws of physics it is not possible to go...
Apr10-14 11:20 PM
Wes Tausend
5 410
I started attending to GR lectures, and there we referred to an intelingent beetle living on a 2D flat space and...
Apr10-14 10:54 AM
ChrisVer
0 253
Given that distance between two points can vary depending on your frame of reference wouldn't that mean that the...
Apr10-14 04:59 AM
ghwellsjr
5 391
I have been trying to work out the solutions to a homogenous line universe using special relativity, and have found...
Apr9-14 10:17 PM
122520253025
2 401
Hey guys based on the Einstein train thought experiment we can say that different inertial frames disagree on...
Apr9-14 04:49 PM
analyst5
20 1,122
In a video on the youtube channel "Veritasium", it is explained that an electric field and a magnetic field is...
Apr9-14 01:37 PM
jartsa
14 652
Suppose we do a constant Jacobian transformation (which is not Lorentz) of a SR (inertial) frame, by using four...
Apr9-14 12:01 PM
hwl
2 513
Kevin Brown, in his excellent book "Reflections on Relativity" p. 409, "immediately" integrates 2 geodesic equations:...
Apr9-14 07:35 AM
Bill_K
1 276
I've been told on many occasions that light will always be measured at the same speed regardless of measuring...
Apr8-14 11:01 PM
ghwellsjr
15 1,051
Dear, If i start from the Einstein Hilbert ACtion and apply the usual Noether rules (as we use them on flat...
Apr8-14 09:42 PM
pervect
2 328
Hey guys, as we know the concept of the rest frame is one of the most famous concepts in any kind of relativity,...
Apr8-14 07:00 PM
analyst5
16 760
Please excuse this question from a lay person but if I don't ask I will never know. I know that the speed of light...
Apr8-14 05:06 PM
somebodyelse
25 797
Hi! I am trying to understand how magnetic fields actually are electric fields viewed in a different frame of...
Apr8-14 12:32 PM
TrickyDicky
20 762
Let's say we have a mass with an object orbitting with constant speed in a circular orbit and a distant observer Bob....
Apr8-14 09:14 AM
PeterDonis
47 1,724

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