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If you are seeking help with a...

Jul1412 08:32 AM
ZapperZ

1 
26,682 
This sticky is for announcements of pertinent scientific events, such as conferences, seminars, or public talks. This...

Aug2014 11:17 AM
marcus

68 
66,977 
Hey a friend linked me to this video:
http://www.youtube.com/watch?v=2u4CFTZtcXE
which attempts to explain how the...

Jun2907 10:05 PM
gabee

16 
3,622 
Hey Guys,
I am currently reading Brian Greene's The Elegant Universe which introduces many of the basic ideas...

Oct1008 02:48 AM
Hyperreality

7 
1,599 
Could any of you clever people answer me this.. Whenever I have read a 'popular' book on string theory, I get the...

Jan1105 06:38 AM
marlon

13 
1,790 
This paper has proposed a theoretical idea to construct particles by
using electron, positron, neutrino and...

Jul1606 04:00 AM
å‘¨é“¶å…µ

0 
1,580 
Hi everybody!!
To point, I'm studying the paper of Perez (http://arxiv.org/PS_cache/grqc/pdf/0402/0402110v3.pdf)...

Dec809 04:20 PM
zwicky

0 
1,023 
Hi every one!
I've been studying the Wipf's article http://arxiv.org/pdf/hepth/9312078 about Canonical...

Jul409 08:30 PM
zwicky

0 
866 
I just can't find a any reference that explain the why of the term "cylindrical" for the states in LQG. Thanks in...

Dec509 08:28 PM
marcus

1 
1,175 
Hi there!
Just asking for a web site with a detailed list of winter/summer schools, workshops and so on for the...

Mar1010 02:35 PM
zwicky

2 
1,215 
Hello everybody.
I have a question about the physical meaning of the simplicity constraints that is often used in...

Dec1110 12:51 PM
zwicky

4 
1,198 
Greetings!
I was just reading a very interesting review about Loop Quantum gravity by L. Smolin entitled "Quantum...

Apr2811 04:42 PM
marcus

1 
806 
In LQG the canonical variables are a SU(2) connection A, and the "electric" field E, such that they form a canonical...

Apr1212 05:44 PM
zwicky

4 
2,016 
Hi. I read a book about 2 years ago called The Holographic Universe, written by Michael Talbot. It described David...

Jan312 10:17 AM
friend

16 
15,158 
To be more specific I mean the 3 familiar spacial dimensions not extra ones(unless I guess they are large enough for...

Jan1410 04:03 AM
arivero

5 
2,007 
OK its right that Einstein put all his efforts in developing the THEORY OF EVERYTHING , but that doesn't means he...

May2912 06:50 AM
bapowell

18 
3,364 
Hi guys I m new to his forums o I hope I post this in the right place.
I have a questions about the 11 dimension....

Aug1312 02:14 PM
Zix

13 
2,085 
Abstract:
This is an attempt to define a bulk which corresponds to both a string
cosmological and brane...

Jun806 04:01 AM
Zitterbewegung

0 
1,226 
This is an attempt to define a bulk which corresponds to both a string
cosmological and brane cosmological formalism...

Jun806 04:01 AM
Zitterbewegung

0 
1,112 
Abstract:
This is an attempt to define a bulk which corresponds to both a string
cosmological and brane...

Jun806 04:01 AM
Zitterbewegung

0 
1,183 
This is an attempt to define a bulk which corresponds to both a string
cosmological and brane cosmological formalism...

Jul1606 04:00 AM
Zitterbewegung

1 
1,236 
Abstract:
This is an attempt to define a bulk which corresponds to both a string
cosmological and brane...

Oct1106 01:08 PM
Zitterbewegung

0 
1,221 
The classical virasoro algebra is the Lie algebra of the group
Diff(S^1), right? So I expected that if I look at the...

Mar2904 07:14 AM
Zig

6 
2,370 
because there are these "weird" spatial geometries on the elementary distance level (PS. sorry, this is unlear)
PS....

Jul1611 04:40 PM
mathman

3 
1,870 
The context is:
1.5 Deterministic Chaos
Chaos brings to mind many things: butterflies in South America changing...

Jul1911 03:42 AM
Demystifier

1 
1,551 
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 
6,931 
Many people believe that spacetime is discrete but what evidences have they ??
in one of issues of 'Scientific of...

Apr2009 05:57 PM
Fra

27 
4,309 
the idea is this, using the Renormalization group equation for our theory (QED, Gravity, Gauge theories..) can tell...

Apr1809 01:13 PM
atyy

3 
1,997 
I know that zeta regularization makes sense but is this paper correct ?
...

Jun1509 04:41 PM
zetafunction

1 
1,204 
what is the reason for LQG in 4dimension to have NO infinities when doing calculations ?? , is it due to the fact...

Feb2310 08:27 PM
hamster143

5 
1,528 
if all the integrals in 'dimensional regularization' are FINITE why do we need counterterms ?? in fact all the poles...

Mar2710 04:47 AM
tom.stoer

5 
1,811 
recently i came across (google) these papers
http://vixra.org/abs/1003.0235
http://vixra.org/abs/1001.0042
...

Apr1110 12:05 PM
qsa

10 
2,119 
given a mul,tiloop integral
\int d^{4}k_{1} \int d^{4}k_{2}.................\int d^{4}k_{n}f(k_{1} ,...

Jun1310 04:10 PM
mathman

3 
1,823 
if in General Relativity the main issue is that 'space is curved' what is the equivalence of it in Quantum mechanics...

Jul2010 02:56 PM
George Jones

1 
936 
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 
870 
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 
887 
why String theory is FREE of infinities ?? ... why there are no divergent integrals in string theory whereas in normal...

Aug1210 06:28 PM
petergreat

9 
1,665 
i found a paper http://vixra.org/pdf/1005.0071v1.pdf so using Zeta regularization i can regularize all the integrals...

Aug1210 11:04 PM
bcrowell

2 
1,173 
given an overlapping divergence
\int_{0}^{\infty} \int_{0}^{\infty}dxdy \frac{xy}{xy+1+x}
what terms must i...

Sep110 04:59 AM
zetafunction

3 
1,106 
the question is could a STRING be a very long object with high energy wrapped into the size of the atom ??
the idea...

Jan1811 03:11 PM
qsa

2 
979 
since the strings are no longer points, the UV divergences are avoided from calculations, but what happens with IR...

Jan711 12:20 PM
humanino

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2,261 
in any case given a multiple integral that has an UV divergence
\int dk_1 \int dk_2 F(k1,k2)(
we can simply...

Apr711 12:12 PM
zetafunction

0 
966 