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

Dec3107 02:06 AM
jtbell

0 
41,097 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

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...

Apr111 08:53 AM
Darlo770

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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...

Feb2214 05:51 PM
FactChecker

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564 
I recently read that space time is curved by and object with mass. The example given was of a trampoline with a...

Nov2308 12:35 PM
tejano

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4,782 
I have two questions about the spacetime interval question.
I'm doing a little research about space time, and...

Mar1611 03:44 PM
Thepolak

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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...

Jan2513 10:40 AM
Mentz114

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...

May1805 10:47 AM
JesseM

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1,383 
keep in mind i am just an average highschooler who likes to read, but i was just wondering about something that i...

Feb2107 02:56 AM
Fredrik

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2,632 
Hi guys
I had a question. We know that roles of space and time reverses inside a black hole. In the schwarzchild...

Jun1111 02:14 PM
pervect

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3,564 
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 
572 
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 
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)...

Dec1110 06:00 PM
PerenialQuest

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775 
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

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7,128 
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 
972 
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

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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...

Feb308 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...

Nov206 10:51 AM
JesseM

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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...

Aug3111 07:58 PM
bobc2

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1,685 
What does actually mean by the saying that Einstein united space and time?

Nov2812 05:51 PM
sreerajt

8 
1,031 
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 
1,316 
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

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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...

Jun2511 12:38 PM
bcrowell

2 
952 
Hello all .
My questions are :
Space/time are any meaning without matter or energy ?
Space/time are exist without...

Dec612 03:37 PM
Naty1

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1,409 
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

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1,195 
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

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3,118 
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

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4,346 
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 
1,409 
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 
1,183 
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 
597 
What would the units be on the curvature of spacetime? G(curvature)=8πGT/c^4

Aug2810 07:02 PM
bcrowell

5 
1,316 
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

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2,053 
I really find difficult understanding what spacetime diagram does relativity use while defining its notion of space...

Nov1313 12:44 AM
rushikesh

20 
2,134 
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

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893 
what is spacetime disturbance..can anyone explain it to me.

Sep2708 06:45 PM
atyy

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2,279 
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

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2,236 
I've always been interested in SpaceTime fabric and have been trying to get a clear answer to whether or not its an...

Y 07:47 PM
infinity149

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480 
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.

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3,635 
is it possible to compare Einstein 4D spacetime to a fluid ?

Aug2609 08:39 PM
cuallito

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1,790 
under which circumstances do we say that something in special relativity is the conseqeunce of spacetime geometry...

Feb2806 08:44 AM
leandros_p

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1,791 
Hi, is Spacetime geometry there even without the presence of matter or does matter produced Spacetime?
Or in other...

Apr2311 08:07 PM
bcrowell

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1,508 
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 
1,821 