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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
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 41,097
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 41,477
Hi, i'm a newbie here, i joined just now purely to ask this question that's been on my mind recently. Now i apologise...
Apr1-11 08:53 AM
4 5,524
Is it true that the speed of light is a conversion factor between time and space? and that D = C*T? and if it...
Feb22-14 05:51 PM
8 564
I recently read that space time is curved by and object with mass. The example given was of a trampoline with a...
Nov23-08 12:35 PM
8 4,782
I have two questions about the space-time interval question. I'm doing a little research about space time, and...
Mar16-11 03:44 PM
8 1,289
so i am hoping that all of you are familiar with the fact that a basic way of finding the distance between two points...
Jan25-13 10:40 AM
6 860
Hi, Well I'm not very knowledgable in this area - or in fact any area of physics but I would like to learn and I...
May18-05 10:47 AM
15 1,383
keep in mind i am just an average highschooler who likes to read, but i was just wondering about something that i...
Feb21-07 02:56 AM
3 2,632
Hi guys I had a question. We know that roles of space and time reverses inside a black hole. In the schwarzchild...
Jun11-11 02:14 PM
18 3,564
Is it possible to have a space-time with no killing vector? Alternatively, can I define the metric only with the...
Sep27-13 10:09 AM
3 572
Ciao. Time slows down when traveling close to light speed. So my question is. I travel out in space to a...
Feb24-06 01:21 AM
15 2,049
Hello All, I'm trying to wrap my head around SR and I have a couple questions: If two space travelers (A) and (C)...
Dec11-10 06:00 PM
5 775
Maybe some one can help clear up a problem. According to Wikipedias article on time dilation “In the case that the...
Jun18-10 12:09 PM
79 7,128
Hey guys! I am considering a space with a diagonal metric, which is maximally symmetric. It can be proven that in...
Oct19-12 04:40 PM
3 972
I was reading on relativity and the speed of light being constant and I thought of a something that seems too...
Sep25-11 01:09 PM
25 7,156
I have a question,why is time and space inseperable,that is,why can't one exist without the other? Oh and I have...
Feb3-08 05:57 PM
Shaun Culver
23 2,550
Hi In trying to get to grips with SR/GR (I'm still unsure about what differentiates them!) one of the things that...
Nov2-06 10:51 AM
9 1,657
as we increase our speed, time goes slow for us, does it mean we will be left behind in times only or as time goes,do...
Aug31-11 07:58 PM
4 1,685
What does actually mean by the saying that Einstein united space and time?
Nov28-12 05:51 PM
8 1,031
So if the interval between two events is spacelike, does that mean that the two events cannot effect each other? Does...
Jul6-08 06:03 PM
4 1,316
hi, In special theory of relativity time is considered as a fourth dimension of space-time, using speed of light.I am...
Nov2-04 12:35 PM
11 2,693
How does time and space appear to a photon in vacuum (i.e. photon at at the speed of light)? Does time stop, when...
Jun25-11 12:38 PM
2 952
Hello all . My questions are : Space/time are any meaning without matter or energy ? Space/time are exist without...
Dec6-12 03:37 PM
10 1,409
Good day! I am quite blur with the Space-time concept proposed by Einstein. Can anyone explain briefly on what he...
Oct14-12 04:34 PM
10 1,195
We know from experiment that time (a measure between two events) slows as we approach speed of light, but does the...
Jan12-09 12:37 PM
7 3,118
I understand that the curvature is caused by the depression of a mass in the space-time surface. What I don't...
Aug16-11 06:37 PM
16 4,346
If gravity rises from the fact that mass bends space-time and stuff falls in because it actually follows a straight...
Apr1-13 11:51 AM
21 1,409
Hi Guys, A question about the curvture of space-time by mass. Where is the point of maximum curvature?? Is...
Nov25-12 11:52 PM
6 1,183
Hi everybody, As you know, the Einstein field equation R_{μ\nu} - 1/2Rg_{μ\nu} =κT_{μ\nu} implies that at...
Apr1-14 11:31 PM
10 597
What would the units be on the curvature of spacetime? G(curvature)=8πGT/c^4
Aug28-10 07:02 PM
5 1,316
I have just started a class that deals with relativity. My professor uses space-time diagrams all the time but has...
Sep5-09 12:38 PM
8 2,053
I really find difficult understanding what spacetime diagram does relativity use while defining its notion of space...
Nov13-13 12:44 AM
20 2,134
Hi there I understand the general idea about the Theory of Relativity and the idea of a 4 dimensional space-time...
Jun24-11 05:10 AM
1 893
what is space-time disturbance..can anyone explain it to me.
Sep27-08 06:45 PM
3 2,279
I don't understand how the space-time fabric works. I've seen videos where the sun is in the space-time fabric and it...
Oct25-09 05:46 AM
3 2,236
I've always been interested in Space-Time fabric and have been trying to get a clear answer to whether or not its an...
Y 07:47 PM
13 480
I would like to ask another 3 question, 1.Gravity causes warps in the space-time fabric in general Relativity what...
Jan4-08 02:46 AM
10 3,635
is it possible to compare Einstein 4D space-time to a fluid ?
Aug26-09 08:39 PM
3 1,790
under which circumstances do we say that something in special relativity is the conseqeunce of space-time geometry...
Feb28-06 08:44 AM
6 1,791
Hi, is Spacetime geometry there even without the presence of matter or does matter produced Spacetime? Or in other...
Apr23-11 08:07 PM
4 1,508
Space-Time is deformed from a uniform gravitation field to one that is compressed inward so as to form a curvature....
Mar3-09 08:07 AM
5 1,821

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