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

Jul1412 08:32 AM
ZapperZ

1 
22,249 
This sticky is for announcements of pertinent scientific events, such as conferences, seminars, or public talks. This...

Apr1214 02:54 PM
marcus

59 
45,832 
i've seen talk jof 4d, 5d, 10d, and even 26d space when talking about string theory. Have any experiments been...

May1411 10:24 PM
raynicolle

28 
10,339 
Hey guys. This is my first post.
I don't have any background in physics so please don't just throw equations and...

May2011 01:39 AM
Nyxie

42 
7,354 
The media frenzy is dying down a bit, and I'm opening this thread to discuss technical questions from researchers and...

May2411 06:34 AM
suprised

485 
117,428 
http://en.wikipedia.org/wiki/Scharnhorst_effect
I found one attempt to explain why it cant be used for FTL...

Jun411 12:29 PM
Halfbaker

2 
2,421 
Physics, astrophysics, etc... have always been near to my heart but far from my brain. My math skills are probably...

May1811 06:28 PM
BlackLeaf

26 
3,033 
I've been search through google to find out if there has been anything on missing energy so far, i have found nothing....

May1911 10:00 AM
eiyaz

6 
2,363 
This came up in another thread, but I have seen the statement many times in various places. The statement is that...

May2111 07:18 PM
nrqed

72 
8,553 
Dear PF,
I am having very heavy supersymmetric derivatives to do (and in general heavy calculations) could you...

May2011 02:47 AM
Neitrino

1 
1,144 
Increasingly QG is being done with a qdeformed symmetry group: replacing SU(2) by
the quantum group SUq(2). What do...

May1511 04:08 PM
tom.stoer

16 
2,874 
A quick question from a nonphysicist and nonmathematician.
Do the equations of the Standard Model (without the...

May1711 10:30 PM
mquirce

10 
2,387 
I do not have any mathematical proof of this being possible, but am hoping to include equations soon. For now, it is...

May1511 09:00 AM
naturale

1 
1,101 
In http://arxiv.org/abs/1010.1939 Rovelli describes his present model as a generalized TQFT. The current quantum...

May1411 11:02 PM
atyy

3 
1,293 
Originally published in 1985:
http://arxiv.org/abs/hepth/9910093.
For MTd2's special attention :smile:

May1511 05:21 PM
atyy

0 
746 
What is the consensus here about Information Theory beyond the Standard model?
The three fundamental theories of...

May1611 05:18 AM
Fra

4 
1,728 
The Erlangen group just posted 7 papers: a series developing an new canonical approach to LQG more explicitly able to...

May1911 01:07 AM
atyy

6 
2,022 
The term "manifest locality" keeps being used, eg. in talks by Cachazo http://pirsa.org/10080013/ and ArkaniHamed...

May1911 06:37 PM
Simon_Tyler

1 
1,322 
Hello everyone. I'm not a physicist however have been doing some research on the concepts behind dark energy and...

May2311 03:00 AM
ordered_chaos

2 
2,144 
What theories of quantum gravity are currently UV complete?

May2411 11:09 AM
nrqed

15 
2,545 
a nice catch by atty ,what do you think.
http://arxiv.org/PS_cache/arxiv/pdf/1105/1105.3930v1.pdf
The emergence...

May2211 04:11 PM
qsa

3 
1,422 
In his 1996 paper on Relational Quantum Mechanics, Carlo Rovelli proposed that “a complete description of the world is...

May2111 01:40 PM
ConradDJ

1 
944 
In a space time 5D, the action for the brane 4D is:
\int dx^4 \sqrt{h}
In the Randall Sundrum the action for...

May2211 01:18 PM
alejandrito29

0 
666 
Based on understanding in and beyond the Standard Model. How big a range can you change the constants values and other...

May2311 10:21 AM
Ryan_m_b

16 
3,374 
I just want to know if there is any theorem that can forbid certain degrees of freedom in the Theory of Everything.
...

May2311 01:51 PM
dhillonv10

4 
1,692 
New to the forum. What a great resource. I just started learning a bit about string theory and naturally I've...

May2311 10:49 PM
Team Bobo

0 
659 
In this new paper today http://arxiv.org/abs/1105.4184, is it considered whether quantum gravity actually has...

May2411 06:39 PM
Physics Monkey

3 
1,335 
According to MTheory there are 11 dimensions including time. 10 of these dimensions are spatial, so objects can move...

May2711 05:43 PM
Helios

4 
1,112 
Are there any news regarding twistor theory?
The original ideas by Penrose to replace spacetime by its "dual...

May2711 06:29 PM
qsa

9 
1,946 
Hi there PF
I would like to ask, which quantum gravity theories are disfavores by:...

May2811 06:08 AM
Schreiberdk

0 
910 
It's difficult, especially for an outsider, to keep track of the multifaceted development of modern physics  to even...

May3011 03:38 AM
S.Daedalus

3 
1,525 
Do you believe that in Quantum Gravity, quantization of gravity is only a small part and it is really Quantum...

May3111 04:49 PM
Naty1

26 
3,022 
Based on the news coming out of every corner of the physics world it seems that String Theory is about to die and...

Jun211 03:20 AM
mitchell porter

28 
6,497 
http://arxiv.org/PS_cache/arxiv/pdf/1105/1105.5283v1.pdf
Abstract
We provide a simple transfer function that...

May2811 07:38 PM
atyy

10 
1,941 
I have been seeing the word supersymmetry, and I recon that it's the unification of quantum theory and relativity or...

May2911 07:59 AM
henry_m

1 
2,550 
No more quantum gravity :smile: As we know strings and loops are both about condensed matter (AdS/CMT, tensor...

May3111 11:38 AM
atyy

9 
1,759 
1) Does heterotic E use E8 for group symmetry & to compactify 16 extra bosonic dimensions...one lattice for each...

May2911 02:06 PM
lkwarren01

0 
954 
I am not quite sure I undestand the origin or phase transition from normal matter
dominated universe into vacuum and...

May3111 10:36 AM
grs1915

0 
1,041 
Does anyone know of a video lecture on the WWW by Prof Wilczek describing his theory of the Grid? (Suitable for...

Jun211 09:41 PM
Spinnor

2 
1,402 
EDIT: fixed TeX issues
Hi, I'm learning about the correspondence in string theory between the geometry of...

Jun211 12:54 PM
Monocles

6 
1,345 
Haelfix pointed out the paper "Quantum Topologically Massive Gravity in de Sitter Space", which calculates a partition...

Jun311 07:33 PM
mitchell porter

2 
1,965 
Sorry for the proliferation of threads, but I wanted to have a thread devoted specifically to analysis of how this...

Jun311 03:34 AM
mitchell porter

2 
1,281 