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

Feb2313 08:40 AM
ZapperZ

1 
37,401 
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

0 
37,157 
The metric due to the gravitational field of a spherical mass is described by the schwarzschild metric
ds2 = c2 (1...

Nov3009 03:39 AM
yuiop

2 
1,540 
I wonder what would various exotic objects in general relativity look like, alone and with things around them, for...

Apr2110 11:12 AM
Artlav

2 
1,540 
To anyone smarter than myself(which should be a lot of people here):
It's clear that relativity neccessitates that...

Nov2003 09:25 AM
Ambitwistor

7 
1,539 
It is well known that traveling at superluminal speeds violates causality, this can be shown by a space time diagram,...

Jul1312 10:15 AM
PeterDonis

16 
1,539 
The Crother's thread obviously needs a new home, as the OP of this thread doesn't want it hijacked to discuss...

Jun2806 12:27 AM
Crothers

8 
1,538 
If I swing my arm, it can emit gravitational waves??
Thank you in advance!

Apr307 07:08 AM
Garth

1 
1,538 
I've read somewhere that a single photon is traveling backward and forward in time and that this is supposed to be...

Jun2709 08:15 PM
diazona

13 
1,538 
Hello,
When you read, you see that there are different opinions on the question, does a photon have mass?
From...

Mar2810 04:57 PM
DaleSpam

2 
1,538 
Hi, I asked a theoretical question here a month or two ago and someone was able to help me. I have another:
Imagine...

Jan2411 07:53 AM
bobc2

14 
1,538 
Does the relative motion of a thing slow down the relative motion of a thing? Hope that makes sense or you can work...

Jan1812 08:53 PM
jartsa

10 
1,538 
Hi All,
Long time no post! I've asked a highlyrelated question to the one I'm about to ask here, but there's a...

Jan1814 12:42 PM
phyti

34 
1,538 
I'm reading, General Relativity, by Robert M. Wald. On page 39 he has the following notation:
\displaystyle{...

Dec2803 07:28 AM
jeff

5 
1,537 
Scientific alternative to the anthropic principle by Baez
http://arxiv.org/pdf/hepth/0407213
To me this is an...

Dec1604 05:24 PM
Andrew Mason

7 
1,537 
Hello,
My name is Edward Solomon and I am curious to know what would happen in the following scenario.
Let us...

Jan2110 07:01 PM
Edward Solomo

5 
1,537 
I have been reading discussions where the Rindler horizon is compared to the event horizon of a black hole.
In the...

Aug2510 07:08 AM
Austin0

0 
1,537 
Although I retired from active physics research almost 2 decades ago, there's a question that has annoyed/intrigued me...

Feb913 11:18 AM
atyy

27 
1,537 
Edit. I think the topic is misinformative and I dont know how to change it.
Hey
I have to translate this into...

Dec1511 09:50 PM
ghwellsjr

3 
1,537 
hi,
I am trying to understand the meaning of the following equation in the simplest way possible
thanks in...

Feb912 05:48 AM
avery

13 
1,537 
Light rays in the schwarzschild metric satisfy the differential equation
\frac {d^2u} {d\phi^2}+u=3Mu^2
...

Apr2105 02:37 PM
pervect

1 
1,536 
1st Q~
if a man in a spaceship travelling at say 0.5 c measures two beams of light outside the spaceship that are in...

Mar3007 10:41 PM
JesseM

7 
1,536 
Why is it impossible to find ALL of einstein's equations in one place? well I suppose its irrelevant, I'd just like to...

May1909 10:58 PM
ilocar

2 
1,536 
Hi, I've begun learning about General Relativity, though I've already had some exposure to differential geometry.
...

Jan912 09:44 PM
PhizzyQs

4 
1,536 
Hi all,
I am wondering if it is possible to derive the definition of a Christoffel symbols using the Covariant...

Jun2912 12:52 AM
GRstudent

14 
1,536 
The action of nonspinning particles in scalar gravity is
...

Oct2708 10:39 PM
tim_lou

6 
1,535 
Here's the impossible scenario I THINK I understand, from the train/platform thought experiments and the "twin...

Aug409 07:01 AM
TrashmanL

10 
1,535 
I am reading Michio Kaku books and Brian Green Books and I am planing reading Stephen Hawking books and I have a...

Mar910 01:20 PM
JesseM

16 
1,535 
In another thread I recently learned that relativistic time dilation does not depend on acceleration, i.e. that there...

Oct410 08:10 AM
DaveC426913

11 
1,535 
Dear relativists,
I have problems trying to understand the following statement in Forces from Connes' geometry
I...

Mar609 06:01 PM
shoehorn

10 
1,534 
To make a long story short I'm suppose to be learning how to "obtain nonzero curvature components of Schwarzschild...

Aug2709 05:45 PM
23571113

14 
1,534 
I'm listening to Prof. Leonard Susskind's lectures on GR on youtube.com at...

Oct912 02:33 PM
pervect

9 
1,534 
What is the definition of a clock in relativity theory?

Aug504 01:30 PM
pmb_phy

3 
1,533 
G'day!
In the paper "Black holes and entropy" (JD Bekenstein, Phys Rev D 7 2333, 1973), in the section on Geroch's...

Jun1007 02:40 AM
pervect

1 
1,533 
A spaceship becomes lighter and easier to accelerate as it burns fuel. If it doesn't literally burn fuel, but it...

Oct109 12:06 PM
Count Iblis

6 
1,533 
A bus travels at a very high speed. It's time slows down.
What's the mechanism by which this happens?
Any help...

Sep1111 06:52 AM
HallsofIvy

4 
1,533 
I have read the wikipedia article on this but my mind just can't seem to comprehend the meaning of this equation. I...

Jan2107 05:09 PM
Pathway

6 
1,532 
Figure 24 in "Spacetime Physics" by Taylor & Wheeler
The figure illustrates the effects of free float on the...

Apr1308 04:16 PM
Daverz

5 
1,532 
In his book 'Einstein's Universe' Nigel Calder wrote (16, BBC, 1979) 
"The world's most powerful accelerator of...

Mar1809 02:01 PM
cam875

6 
1,532 
The question is:
A rocket has a constant acceleration in a rest frame that is 0 to 0.8c in 4s. What is its proper...

Mar2809 03:51 AM
Al68

9 
1,532 
..the future of the cone be blocked because of information is ceased?
Hello everyone. This is my first post, and I am...

Apr709 11:12 PM
aaryan0077

0 
1,532 
Okay, weird question. Sorry if this is really stupid but it's been bugging at me for days now.
First, let me lay...

Sep2110 01:44 PM
Mentz114

8 
1,532 