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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
1 42,480
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
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Here's a scenario I thought of a few days ago. I know there must be an easy explanation, but it hasn't come to me ......
Nov24-04 01:46 PM
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May25-06 03:22 PM
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Why the physicists studying a "AdS black hole"? what is the meaning of AdS (Anti de Sitter) for black hole? and...
Jun18-08 12:43 AM
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I've always thought that understanding at a profound level requires real precision in the use of language. I was...
Jan10-10 01:25 PM
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In my cosmology lectures they say that a negative curvature gives an infinite space but I was thinking what about the...
Feb19-10 07:06 AM
George Jones
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I just finished watching a hawkins program about time travel that theorized that the faster an object travels through...
Aug28-10 08:18 AM
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When an object moves in curved spacetime, how does its angular momentum vector transform? My hunch is that the...
Oct10-10 03:12 PM
2 1,035
What do you think of the article published in the "European Physical Journal D" with the title: "The quantum vacuum...
Mar28-13 07:24 AM
Vanadium 50
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So, this has really stirred my interest. To be clear, I'm not citing these as sources, simply linking for discussion;...
Jun12-14 07:37 PM
Simon Bridge
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i strongly suspect that there is mathematical constraint on space time whicg is differensiable function ofmetrics and...
Jun28-04 08:06 AM
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I am rather confused with General Relativities explanation of Gravity!...
Apr28-05 01:15 PM
6 1,034
Perhaps it is a stupid question, but really confuses me. In QFT, virtual particles can be produced from vacuum, say,...
Jun27-05 02:58 PM
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If i have two fish in a fish tank say fish A and fish B and the owner of the tank is looking into the tank each...
Apr20-08 03:17 PM
3 1,034
Say we have dust filled universe. At some instant of time this universe has a mass density rho, and it evolves with...
Dec21-09 08:20 PM
George Jones
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As something approaches the speed of light the objects relative mass is increasing. When the relatvie mass is...
Jan14-10 04:52 AM
5 1,034
Hi, I'm not a physicist and my idea of relativity is limited by wiki... but I have one question... If I sit with...
May2-12 01:09 PM
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A thought occurred to me when reading the Encarta article on relativity: Now, it occurs to me that the velocity...
May4-04 08:44 PM
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Does the theory of relativity include angular motion? Say we have one body synchronously orbiting a motionless body....
Sep5-08 06:41 AM
3 1,033
My question is, which photon is the one that first hits the square in the following example If I had a large...
Jan11-10 07:35 PM
5 1,033
Hey, I'm stuck on part of the calculation for the compton wavelength. Basically, my notes go: Energy of Electron ...
Feb14-10 03:53 PM
8 1,033
Lets say we emit a photon from the ground out towards the sky , and as the photon travels away from earth it gets...
Jul8-10 05:45 PM
12 1,033
Hi all. Suppose we have two objects A and B, and suppose we tie a rope R to the objects with the rope R's two edges...
Jun19-11 09:30 PM
5 1,033
The time dilation formula: \Delta t'=\frac{\Delta t}{\sqrt{1-\frac{v}{c}}} says that the closer you come to the...
Jul15-11 12:58 PM
3 1,033
i constantly feel that newton was right in measuring the relative velocity.einstein makes use of light which has a...
Aug22-11 02:32 AM
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Has any experiments been done equal to this scenerio where the twin leaving earth and seeing earth time dilated.. but...
Dec29-12 11:02 AM
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Dear Friends, Discussion of the Einstein's Special Relativity clock paradox is often complicated by the role of...
Jul4-13 11:50 AM
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It is often said that we basically live in the past, since it takes time for light to travel from objects to our eyes...
Jun10-14 12:40 PM
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HI guys first post :cool: I need to show that B^2-E^2/C^2 is invariant under Lorentz transformation (E and B...
Apr30-04 09:31 AM
6 1,032
Baez gave fine presentation of general relativity: I wish...
Jul21-08 09:29 AM
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Why no FAQ for the Twin Paradox? There are a few topics for which a FAQ would be very useful. I'd suggest that the...
Jun2-09 09:48 AM
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As long as there is any energy/mass at all in our universe, time will always be in a "slowed" state. So, let's say we...
Feb26-11 03:42 AM
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Studying the movement of a particle on bound orbits around a black hole I found a fact that seemed a little strange...
Jul16-13 07:17 PM
11 1,031
as a warning, my knowledge of physics is purely on the level of 'mild interest'. Any innacuracies/stupidities in the...
Jan18-05 06:47 AM
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Hey, I was reading through a few of these posts, and something crossed my mind: Say there was a space ship...
Nov17-05 03:17 PM
10 1,031
Okay, I realize that there are difficulties in combining the theory of GR and quantum mechanics, but I thought SR and...
Oct29-06 04:41 PM
2 1,031
so, a bit of confusion here - suppose i have a spaceship that can acheive 0.99999C, and i decide to go to a star that...
Aug2-10 04:22 PM
Doc Al
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A thought experiment: Say that you and I decide we are going to go into orbit around a black hole. I am brave and you...
Oct5-10 07:58 PM
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hi if gravity is a force of attraction ,a natural question arises ,why it can't be repulsive?as there is a great...
Mar19-11 07:55 PM
9 1,031
I am steadily working my way through D'Inverno and have reached Chapter 20. On page 272 there is a problem which goes...
Nov22-12 12:35 PM
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We have two clocks within a laboratory. We put one on the table and the other in a centrifuge made of glass so we can...
Apr22-13 05:45 PM
5 1,031

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