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Beyond the Standard Model

- Professionally researched theories... strings, branes, & LQG
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Jul14-12 08:32 AM
ZapperZ
1 25,808
announcements, btsm, event Sticky Thread Pinned: BtSM Event Announcements ( 1 2 3 ... Last)
This sticky is for announcements of pertinent scientific events, such as conferences, seminars, or public talks. This...
Y 12:49 AM
marcus
64 62,982
Hey a friend linked me to this video: http://www.youtube.com/watch?v=2u4CFTZtcXE which attempts to explain how the...
Jun29-07 10:05 PM
gabee
16 3,513
Hey Guys, I am currently reading Brian Greene's The Elegant Universe which introduces many of the basic ideas...
Oct10-08 02:48 AM
Hyperreality
7 1,578
Could any of you clever people answer me this.. Whenever I have read a 'popular' book on string theory, I get the...
Jan11-05 06:38 AM
marlon
13 1,774
This paper has proposed a theoretical idea to construct particles by using electron, positron, neutrino and...
Jul16-06 04:00 AM
周银兵
0 1,565
Hi everybody!! To point, I'm studying the paper of Perez (http://arxiv.org/PS_cache/gr-qc/pdf/0402/0402110v3.pdf)...
Dec8-09 04:20 PM
zwicky
0 1,010
Hi every one! I've been studying the Wipf's article http://arxiv.org/pdf/hep-th/9312078 about Canonical...
Jul4-09 08:30 PM
zwicky
0 856
I just can't find a any reference that explain the why of the term "cylindrical" for the states in LQG. Thanks in...
Dec5-09 08:28 PM
marcus
1 1,159
Hi there! Just asking for a web site with a detailed list of winter/summer schools, workshops and so on for the...
Mar10-10 02:35 PM
zwicky
2 1,190
Hello everybody. I have a question about the physical meaning of the simplicity constraints that is often used in...
Dec11-10 12:51 PM
zwicky
4 1,168
Greetings! I was just reading a very interesting review about Loop Quantum gravity by L. Smolin entitled "Quantum...
Apr28-11 04:42 PM
marcus
1 794
In LQG the canonical variables are a SU(2) connection A, and the "electric" field E, such that they form a canonical...
Apr12-12 05:44 PM
zwicky
4 1,975
Hi. I read a book about 2 years ago called The Holographic Universe, written by Michael Talbot. It described David...
Jan3-12 10:17 AM
friend
16 14,970
To be more specific I mean the 3 familiar spacial dimensions not extra ones(unless I guess they are large enough for...
Jan14-10 04:03 AM
arivero
5 1,993
OK its right that Einstein put all his efforts in developing the THEORY OF EVERYTHING , but that doesn't means he...
May29-12 06:50 AM
bapowell
18 3,309
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....
Aug13-12 02:14 PM
Zix
13 2,035
Abstract: This is an attempt to define a bulk which corresponds to both a string cosmological and brane...
Jun8-06 04:01 AM
Zitterbewegung
0 1,208
This is an attempt to define a bulk which corresponds to both a string cosmological and brane cosmological formalism...
Jun8-06 04:01 AM
Zitterbewegung
0 1,103
Abstract: This is an attempt to define a bulk which corresponds to both a string cosmological and brane...
Jun8-06 04:01 AM
Zitterbewegung
0 1,169
This is an attempt to define a bulk which corresponds to both a string cosmological and brane cosmological formalism...
Jul16-06 04:00 AM
Zitterbewegung
1 1,227
Abstract: This is an attempt to define a bulk which corresponds to both a string cosmological and brane...
Oct11-06 01:08 PM
Zitterbewegung
0 1,202
The classical virasoro algebra is the Lie algebra of the group Diff(S^1), right? So I expected that if I look at the...
Mar29-04 07:14 AM
Zig
6 2,347
because there are these "weird" spatial geometries on the elementary distance level (PS. sorry, this is unlear) PS....
Jul16-11 04:40 PM
mathman
3 1,848
The context is: 1.5 Deterministic Chaos Chaos brings to mind many things: butterflies in South America changing...
Jul19-11 03:42 AM
Demystifier
1 1,525
The question I want to ask is pretty much in the title: Why is string theory becoming less of an excitement amongst...
Jul22-10 10:07 AM
MTd2
50 6,842
Many people believe that spacetime is discrete but what evidences have they ?? in one of issues of 'Scientific of...
Apr20-09 05:57 PM
Fra
27 4,204
the idea is this, using the Renormalization group equation for our theory (QED, Gravity, Gauge theories..) can tell...
Apr18-09 01:13 PM
atyy
3 1,967
I know that zeta regularization makes sense but is this paper correct ? ...
Jun15-09 04:41 PM
zetafunction
1 1,188
what is the reason for LQG in 4-dimension to have NO infinities when doing calculations ?? , is it due to the fact...
Feb23-10 08:27 PM
hamster143
5 1,486
if all the integrals in 'dimensional regularization' are FINITE why do we need counterterms ?? in fact all the poles...
Mar27-10 04:47 AM
tom.stoer
5 1,771
recently i came across (google) these papers http://vixra.org/abs/1003.0235 http://vixra.org/abs/1001.0042 ...
Apr11-10 12:05 PM
qsa
10 2,104
given a mul,ti-loop integral \int d^{4}k_{1} \int d^{4}k_{2}.................\int d^{4}k_{n}f(k_{1} ,...
Jun13-10 04:10 PM
mathman
3 1,804
if in General Relativity the main issue is that 'space is curved' what is the equivalence of it in Quantum mechanics...
Jul20-10 02:56 PM
George Jones
1 919
if we use Semiclassical Quantum Gravity , will we get or can we get EXACT results ? or only asymptotic approximation ...
Jul29-10 11:39 AM
zetafunction
0 844
given the conmutator of Astehkar variable = i\hbar \delta_{a}^{b}\delta_{a}^{b} then using the WKB procedure,...
Aug5-10 03:11 AM
zetafunction
0 874
why String theory is FREE of infinities ?? ... why there are no divergent integrals in string theory whereas in normal...
Aug12-10 06:28 PM
petergreat
9 1,643
i found a paper http://vixra.org/pdf/1005.0071v1.pdf so using Zeta regularization i can regularize all the integrals...
Aug12-10 11:04 PM
bcrowell
2 1,159
given an overlapping divergence \int_{0}^{\infty} \int_{0}^{\infty}dxdy \frac{xy}{xy+1+x} what terms must i...
Sep1-10 04:59 AM
zetafunction
3 1,096
the question is could a STRING be a very long object with high energy wrapped into the size of the atom ?? the idea...
Jan18-11 03:11 PM
qsa
2 964
since the strings are no longer points, the UV divergences are avoided from calculations, but what happens with IR...
Jan7-11 12:20 PM
humanino
20 2,228
in any case given a multiple integral that has an UV divergence \int dk_1 \int dk_2 F(k1,k2)( we can simply...
Apr7-11 12:12 PM
zetafunction
0 955

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