
This sticky is for announcements of pertinent scientific events, such as conferences, seminars, or public talks. This...

Sep1514 12:03 AM
marcus

72 
67,875 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Jul1412 08:32 AM
ZapperZ

1 
26,915 
Suppose we detect a new force whose gauge group would require a SU(N) rep. What would be the smallest one that could...

Aug910 02:10 PM
LukeD

24 
2,482 
As I understand, it is postulated that only coherent states in LQG correspond to classical spacetimes. Is the ground...

Aug910 10:39 AM
marcus

4 
1,912 
I found this interesting article, (feb 12, 2001):
http://www.sciencedaily.com/releases/2001/02/010212075309.htm
...

Aug710 08:20 PM
crx

0 
2,281 
I am posting my question in this forum because it is about a basic conceptual aspect of LQG discussed in Rovelli's...

Aug710 03:08 PM
haushofer

110 
12,439 
Unruh (by definition) effect shows that an accelerating observer will observe blackbody radiation....

Aug710 02:21 AM
czes

2 
2,069 
I thought I'd share this intriguing article I found on Phys Org: http://www.physorg.com/news200224981.html
The title...

Aug510 10:53 PM
Kevin_Axion

0 
1,086 
MTd2 spotted this one. It was time for a paper like this. Very glad to see it.
http://arxiv.org/abs/1008.0354

Aug510 10:17 PM
marcus

8 
2,350 
given the conmutator of Astehkar variable
= i\hbar \delta_{a}^{b}\delta_{a}^{b}
then using the WKB procedure,...

Aug510 03:11 AM
zetafunction

0 
890 
Vincent Rivasseau and four others just posted "July3150" (I mean 1007.3150, just easier to remember that way for some...

Aug410 05:38 PM
marcus

20 
3,239 
what do you think of this explanation about calabiyau and other 4 dimensions
1)...

Aug410 05:05 PM
sbrothy

5 
1,185 
Hey, I would like to ask you: I need have Standard Model with righthanded neutrinos. This is the simplest extension...

Aug310 02:45 PM
GeV

0 
1,132 
Atyy recently pointed us to a provocative quote from MTW:
Mathematics was not sufficiently refined in 1917 to cleave...

Aug210 07:43 PM
marcus

6 
1,694 
I must put both of them because I want to have an idea of dynamics here, of scattering and of geometry at the same...

Aug110 11:31 AM
marcus

1 
1,182 
On page 109 he does the example of the "timeless double pendulum".
He says that the phase space is two dimensional. I...

Aug110 05:12 AM
sheaf

1 
914 
What are the dimensions of the branes that to which it attaches? Can a string attach to other string as it were a...

Aug110 05:02 AM
mitchell porter

3 
1,578 
The almost simultaneous detection of low energy and high energy photons puts tight constraints on models predicting...

Aug110 01:32 AM
marcus

25 
3,669 
There were "rumors" that Ed Witten has deemphasized string theory in his personal research quite possibly discouraged...

Jul3110 11:20 AM
tom.stoer

24 
5,190 
page 4
"therefore one does not try to quantize gravity but instead attempts to provide a quantum description of...

Jul2910 09:03 PM
ensabah6

0 
1,173 
Hi all.
Last night while trying to explain how the world looks at the Quantum level I found myself stumbling upon a...

Jul2910 01:00 PM
Kevin_Axion

1 
1,017 
if we use Semiclassical Quantum Gravity , will we get or can we get EXACT results ? or only asymptotic approximation
...

Jul2910 11:39 AM
zetafunction

0 
878 
Does his Geometric Langlands research have anything to do with real physics? Or has he basically turned into a pure...

Jul2910 11:37 AM
ccdantas

40 
7,945 
.
How a field request capacity of a channel?

Jul2910 05:33 AM
Fra

17 
2,329 
Recently I wrote a paper "Holograph in noncommutative geometry":
http://arxiv.org/abs/1007.2976
Abstract::
In this...

Jul2810 02:38 AM
shuijing

0 
785 
Spin networks describing BH have a central node with label taken from an intertwiner Hilbertspace of high dimension...

Jul2710 07:00 PM
atyy

4 
2,195 
In analog models of gravity, such as acoustic metric theory, the motion of "matter" is influenced by the metric....

Jul2710 05:43 PM
Argonaught

2 
1,185 
Thus far Tevatron and possibly LHC has found no evidence of SUSY, and DM searches thus far null and void. Steinhardt...

Jul2610 07:45 AM
ensabah6

8 
8,044 
Would it make sense to think of excitations of a node as it they were made of particles of spin occupying states just...

Jul2610 06:45 AM
Fra

17 
3,275 
What can we learn, if anything, from how the organizers of the ICHEP chose to represent the growing research activity...

Jul2510 10:39 PM
marcus

8 
1,961 
I do not think that the following was presented as a live video.
...

Jul2510 05:35 PM
jal

1 
1,087 
regarding the problem of time in QG,
Is time absolute or dynamical in LQG?
string theory?
How does LQG and...

Jul2510 05:16 PM
ensabah6

7 
1,729 
I have only taken a few college physics courses, and I have watched some videos about string theory. I would like to...

Jul2510 01:41 AM
rai linga

13 
6,393 
LQG research is having what looks like a "heyday". A rush of papers that fit the various pieces of the puzzle...

Jul2410 06:43 PM
marcus

2 
1,461 
Hey there PF, as you can see I am newly registered here, but I have been floating around for a little while now...

Jul2410 05:45 PM
Baraccus

6 
1,270 
http://arxiv.org/abs/1006.0199
From twistors to twisted geometries
Laurent Freidel, Simone Speziale
9 pages...

Jul2310 06:15 PM
MTd2

3 
1,506 
Hi,
I have a short question about gauge theories and constraints. Imagine I have a symmetry algebra, and I gauge...

Jul2310 04:59 PM
torquil

1 
1,113 
Does anyone know where I can find the lagrangian for this?
From memory I believe it looks something like
S =...

Jul2310 11:53 AM
jdstokes

3 
1,147 
In classical general relativity it is known that angle of deflection is proportional to radius1 from the center of...

Jul2310 10:38 AM
exponent137

1 
844 
I don't know if it is the correct subforum, if I choose wrong then feel free to move the thread.
I was listening...

Jul2310 06:54 AM
xepma

3 
1,831 
The question I want to ask is pretty much in the title: Why is string theory becoming less of an excitement amongst...

Jul2210 10:07 AM
MTd2

50 
6,973 
Here is a new LQG resource site.
http://sites.google.com/site/quantumgravitytheory/
I hope it will be useful.

Jul2110 11:00 PM
SuperStringboy

2 
1,108 