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

Dec3107 02:06 AM
jtbell

0 
40,531 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

1 
40,882 
Is it possible to have a spacetime with no killing vector?
Alternatively, can I define the metric only with the...

Sep2713 10:09 AM
PeterDonis

3 
556 
Ciao.
Time slows down when traveling close to light speed.
So my question is.
I travel out in space to a...

Feb2406 01:21 AM
Jorrie

15 
1,998 
Hello All,
I'm trying to wrap my head around SR and I have a couple questions: If two space travelers (A) and (C)...

Dec1110 06:00 PM
PerenialQuest

5 
773 
Maybe some one can help clear up a problem. According to Wikipedias article on time dilation
“In the case that the...

Jun1810 12:09 PM
yogi

79 
7,097 
Hey guys! I am considering a space with a diagonal metric, which is maximally symmetric.
It can be proven that in...

Oct1912 04:40 PM
pervect

3 
969 
I was reading on relativity and the speed of light being constant and I thought of a something that seems too...

Sep2511 01:09 PM
anarcher

25 
7,138 
I have a question,why is time and space inseperable,that is,why can't one exist without the other?
Oh and I have...

Feb308 05:57 PM
Shaun Culver

23 
2,548 
Hi
In trying to get to grips with SR/GR (I'm still unsure about what differentiates them!) one of the things that...

Nov206 10:51 AM
JesseM

9 
1,496 
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...

Aug3111 07:58 PM
bobc2

4 
1,679 
What does actually mean by the saying that Einstein united space and time?

Nov2812 05:51 PM
sreerajt

8 
1,028 
So if the interval between two events is spacelike, does that mean that the two events cannot effect each other? Does...

Jul608 06:03 PM
matheinste

4 
1,313 
hi,
In special theory of relativity time is considered as a fourth dimension of spacetime, using speed of light.I am...

Nov204 12:35 PM
gonzo

11 
2,614 
How does time and space appear to a photon in vacuum (i.e. photon at at the speed of light)?
Does time stop, when...

Jun2511 12:38 PM
bcrowell

2 
948 
Hello all .
My questions are :
Space/time are any meaning without matter or energy ?
Space/time are exist without...

Dec612 03:37 PM
Naty1

10 
1,399 
Good day!
I am quite blur with the Spacetime concept proposed by Einstein.
Can anyone explain briefly on what he...

Oct1412 04:34 PM
Naty1

10 
1,192 
We know from experiment that time (a measure between two events) slows as we approach speed of light, but does the...

Jan1209 12:37 PM
Naty1

7 
3,112 
I understand that the curvature is caused by the depression of a mass in the spacetime surface. What I don't...

Aug1611 06:37 PM
PAllen

16 
4,295 
If gravity rises from the fact that mass bends spacetime and stuff falls in because it actually follows a straight...

Apr113 11:51 AM
A.T.

21 
1,403 
Hi Guys,
A question about the curvture of spacetime by mass.
Where is the point of maximum curvature??
Is...

Nov2512 11:52 PM
pervect

6 
1,179 
Hi everybody,
As you know, the Einstein field equation
R_{μ\nu}  1/2Rg_{μ\nu} =κT_{μ\nu}
implies that at...

Apr114 11:31 PM
bcrowell

10 
596 
What would the units be on the curvature of spacetime? G(curvature)=8πGT/c^4

Aug2810 07:02 PM
bcrowell

5 
1,307 
I have just started a class that deals with relativity. My professor uses spacetime diagrams all the time but has...

Sep509 12:38 PM
tinytim

8 
2,037 
I really find difficult understanding what spacetime diagram does relativity use while defining its notion of space...

Nov1313 12:44 AM
rushikesh

20 
2,086 
Hi there
I understand the general idea about the Theory of Relativity and the idea of a 4 dimensional spacetime...

Jun2411 05:10 AM
phyzguy

1 
892 
what is spacetime disturbance..can anyone explain it to me.

Sep2708 06:45 PM
atyy

3 
2,274 
I don't understand how the spacetime fabric works. I've seen videos where the sun is in the spacetime fabric and it...

Oct2509 05:46 AM
haushofer

3 
2,227 
I would like to ask another 3 question,
1.Gravity causes warps in the spacetime fabric in general Relativity what...

Jan408 02:46 AM
A.T.

10 
3,627 
is it possible to compare Einstein 4D spacetime to a fluid ?

Aug2609 08:39 PM
cuallito

3 
1,784 
under which circumstances do we say that something in special relativity is the conseqeunce of spacetime geometry...

Feb2806 08:44 AM
leandros_p

6 
1,779 
Hi, is Spacetime geometry there even without the presence of matter or does matter produced Spacetime?
Or in other...

Apr2311 08:07 PM
bcrowell

4 
1,451 
SpaceTime is deformed from a uniform gravitation field to one that is compressed inward so as to form a curvature....

Mar309 08:07 AM
Naty1

5 
1,812 
Cinsider please the invariance of the spacetime interval in an one space dimension approach...

Jan2709 10:53 PM
bernhard.rothenstein

5 
1,782 
Please tell me if the following statement is correct:
In
cc(dt)^2(dx)^2=cc(dt')^2(dx')^2
dx and dx' represent...

Dec3007 05:05 PM
country boy

16 
4,261 
Hi, so I was going over my lectures notes and I was looking at the Invariance, S2 for space time.
I was just...

Oct2312 07:28 PM
RadiantL

3 
705 
Why is it possible that an object can be found in the same place in different times but can not be found at the same...

Jan911 08:09 AM
DaleSpam

6 
1,202 
Hi.
I know that as an object travels faster, its mass increases. Would this increase create a larger curvature in...

Nov1913 09:29 PM
pervect

9 
809 
I find in the literature the following transformation equations for the spacetime coordinates
x'=g(xvt)
t'=t/g...

Sep808 06:28 AM
DrGreg

31 
5,625 
A mass moves through spacetime at constant velocity. Spacetime around this mass is warped by the mass and as the...

Jan3114 12:43 AM
Nugatory

8 
563 
Imaging at a Trillion Frame Per Second  Ramesh Raskar
...

Oct2113 03:07 PM
A.T.

3 
545 
I've read about Schwarzschild and Kerr metric, I confused about the spacelike singularity(occur in nonrotating...

May2810 05:55 AM
stevebd1

2 
2,147 