Factbites
 Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Supergravity


Related Topics

In the News (Tue 23 Jul 19)

  
  Supergravity
Supergravity is a quantum field theory of elemental particles based on Supersymmetry theories, which is consistent with General Relativity on local scales (as opposed to global scales).
Supergravity theories predict the existence of a boson (a force-carrying particle known as the graviton [spin-2] and its fermionic superpartner, the gravitino (spin 3/2), both of which are massless.
Supergravity theories have fallen out of favor in recent years due to the necessity of an unrealistically large cosmological constant in four dimensions, thus requires fine-tuning without at least another seven dimensions (as in 11-dimensional string theories).
www.iscid.org /encyclopedia/Supergravity   (229 words)

  
 7.3 Divergence properties of N=8 supergravity
In all cases the linearized divergences take the form of derivatives acting on a particular contraction of Riemann tensors, which in four dimensions is equivalent to the square of the Bel-Robinson tensor [6, 37, 38].
This operator appears in the first set of corrections to the N =8 supergravity Lagrangian, in the inverse string-tension expansion of the effective field theory for the type II superstring [77].
The explicit form of the linearized N =1, D =11 counterterm expressed as derivatives acting on Riemann tensors along with a more general discussion of supergravity divergences may be found in Ref. [17].
relativity.livingreviews.org /Articles/lrr-2002-5/node19.html   (599 words)

  
  Supergravity
Supergravity is a type of quantum theory of elementary particles and their interactions that is based on the particle symmetry known as supersymmetry and that naturally includes gravity along with the other fundamental forces (the electromagnetic force, the weak nuclear force, and the strong nuclear force).
Moreover, these supergravity theories seem to be free from various infinite quantities that usually arise in quantum theories of gravity.
In the simplest form of supergravity, the only particles that exist are the graviton with spin 2 and its fermionic partner, the gravitino, with spin 3/2.
abyss.uoregon.edu /~js/glossary/supergravity.html   (0 words)

  
 Supergravity Summary
Supergravity models generically result in an unrealistically large cosmological constant in four dimensions, and that constant is difficult to remove, and so require fine-tuning.
Many, if not all supergravity theories are the classical limits of superstring theory (i.e., the limit in which the string is approximated as having zero length, and treated as a dimensionless point-particle), with the exception of "maximal" 11-dimensional supergravity, which is, by definition, a classical limit of M-theory.
IIA SUGRA is the dimensional reductions of 11-dimensional supergravity on a circle.
www.bookrags.com /Supergravity   (5185 words)

  
 CERN Courier - Supergravity celebrates quar - IOP Publishing - article
On 3-4 December 2001, an international meeting, "Supergravity at 25", was hosted by the C N Yang Institute for Theoretical Physics at the Stony Brook campus of the State University of New York, to commemorate the anniversary of this protean theory, and to assess its ongoing role today.
The development of supergravity 25 years ago may be thought of as the exercise of identifying a minimal set of interactions between gravitons and gravitinos that respects general co-ordinate invariance and makes supersymmetry a gauge symmetry.
Supergravity is also central to a remarkable discovery called the AdS/CFT correspondence, which relates supergravity in higher-dimensional anti-de Sitter (AdS) space-time (a space-time with constantly negative curvature) to strongly coupled gauge field theories (CFT).
cerncourier.com /main/article/42/7/17   (1517 words)

  
 The Graduate Review - The Newsletter of the Stony Brook University Graduate School
The award recognizes the discovery of supergravity, announced in a series of research papers in 1976, when Freedman was also on the faculty of the Institute of Theoretical Physics and Ferrara was a frequent collaborator there.
Supergravity is one of Stony Brook's greatest contributions to science.
Supergravity quickly became a pillar of mathematical physics.
www.grad.sunysb.edu /newsletter/supergravity.htm   (422 words)

  
 gaillard research
Supersymmetry provides a possible mechanism for understanding the large hierarchy in scale between the masses of particles studied with accelerators and the “natural” scale of physics which is the Planck mass.
Supergravity, particularly when regarded as the “low energy” limit of superstring theory, provides the best hope at present for unification of all forces.
I am studying effective supergravity theories for particle physics, with the goal of addressing the problems of supersymmetry breaking and electroweak symmetry breaking, as well as other aspects of particle physics and cosmology, in the context of superstring theory.
www.physics.berkeley.edu /research/faculty/Gaillard.html   (490 words)

  
 [No title]   (Site not responding. Last check: )
It was already known that less supersymmetric supergravities can't generate a finite theory in d=4.

The N=8 supergravity itself is phenomenologically unacceptable and one must break SUSY to at most N=1 supersymmetry to get a semi-realistic theory.
It would be interesting to see whether some other, less supersymmetric supergravity theories that naturally arise from string theory could lead to similar cancellations if the additional matter is taken into account.

A new argument supporting the importance of "N=8" supergravity would be a good news for the inevitability of string theory.
The N=8 supergravity is not a random theory of gravity.
www.blogger.com /feeds/8666091/posts/full/116223955199563563   (989 words)

  
 RESONAANCES: N=8 supergravity according to Lance Dixon
That's a legitimate approach, since N=8 supergravity is probably not relevant in any way for the real world.
N=8 supergravity would be the first example of a finite four-dimensional QFT containing gravity.
For N=8 supergravity the corresponding gauge theory is N=4 super-Yang-Mills, a finite one.
resonaances.blogspot.com /2007/01/n8-supergravity-according-to-lance.html   (633 words)

  
 [No title]
Supergravity [PHYS] A supersymmetry which is used to unify general relativity and quantum theory; it is formed by adding to the poincare group, as a symmetry of space-time, four new generators that behave as spinors and vary as the square root of the translations.
In the vacuum of space, if the means of mass acceleration stops the mass will then be riding on a soliton wave of gravitons and will maintain a constant velocity unless disturbed by a gravitational field.
Like other physical symmetries, extended supergravity can also be viewed in terms of a "superparticle" with an arrow in an auxiliary space of many dimensions.
www.supersymmetry.com   (2345 words)

  
 [No title]
This was one of the earliest papers on the so-called background field method which was used extensively in various calculations in guage theories, in gravity and supergravity.
It was discovered that in supergravity with open guage algebra the correct Feynman rules are different from the Feynman rules in non- Abelian guage theories.
It was shown that the entropy of the supersymmetric fl holes in N=8 supergravity is given by a unique quartic invariant of the exceptional non-compact group E/sub 7(7)/.
www.physics.ucla.edu /~cwp/internal/Particles_and_Fields/Kallosh,_Renata@880583050.html   (533 words)

  
 CiteULike: Supersymmetry and Supergravity
In this new volume Supersymmetry and Supergravity has been greatly expanded to include a detailed derivation of the most general coupling of super-symmetric gauge theory to supergravity.
It emphasizes the logical coherence of the subject and should appeal to physicists whose interests range from the mathematical to the phenomenological.
In praise of the first edition: "A beautiful exposition of the original ideas of Wess and Zumino in formulating N = 1 supersymmetry and supergravity theories, couched in the language of superfields introduced by Strathdee and the reviewer....
www.citeulike.org /user/ihuston/article/841977   (432 words)

  
 [hep-th/0204035] Lectures on supergravity
Abstract: The text is an essentially self-contained introduction to four-dimensional N=1 supergravity, including its couplings to super Yang-Mills and chiral matter multiplets, for readers with basic knowledge of standard gauge theories and general relativity.
Emphasis is put on showing how supergravity fits in the general framework of gauge theories and how it can be derived from a tensor calculus for gauge theories of a standard form.
Off-shell formulations of D=4, N=1 supergravity with matter, A. Lorentz algebra, spinors, Grassmann parity, B. Explicit verification of local supersymmetry.
arxiv.org /abs/hep-th/0204035   (171 words)

  
 The axion mass in modular invariant supergravity
When supersymmetry is broken by condensates with a single condensing gauge group, there is a nonanomalous R-symmetry that prevents the universal axion from acquiring a mass.
It has been argued that, in the context of supergravity, higher dimension operators will break this symmetry and may generate an axion mass too large to allow the identification of the universal axion with the QCD axion.
We show that such contributions to the axion mass are highly suppressed in a class of models where the effective Lagrangian for gaugino and matter condensation respects modular invariance (T-duality).
repositories.cdlib.org /lbnl/LBNL-56983   (145 words)

  
 QUASAR9: Symmetry in Supergravity
In the vacuum of space, if the means of mass acceleration stops the mass will then be riding on a soliton wave of gravitons and will maintain a constant velocity unless disturbed by a gravitational field.
If operating in a 'super-conducting' environment, the four armatures can be four new generators that "behave" as spinors and vary as a function of the propagation translation.
Like other physical symmetries, extended supergravity can also be viewed in terms of a "superparticle" with an arrow in an auxiliary space of many dimensions.
quasar9.blogspot.com /2006/08/symmetry-in-supergravity.html   (1279 words)

  
 Supergravity @ 25
C.N. Yang Institute for Theoretical Physics will host the conference Supergravity at 25 at the Stony Brook campus of the State University of New York.
This conference will celebrate this year as the 25th anniversary of the discovery of the theory of supergravity, in which Stony Brook played a major role.
There will be 20 half-hour talks covering the development of supergravity, from its conception till the present, and including prospects for the future.
insti.physics.sunysb.edu /itp/sg25   (259 words)

  
 Not Even Wrong » Blog Archive » Again, Is N=8 Supergravity Finite?
One often hears claims that gravity can’t be quantized using QFT, that string theory is needed to “smooth out the violent space-time fluctuations at the Planck scale”, or some such explanation for the inherent non-renormalizability of quantum field theories of gravity.
From the earliest days of their study, it was hoped that supergravity theories would have better renormalizability properties, with the maximally extended supergravity, N=8 supergravity, the most likely to be well-behaved.
For years the general belief has been that N=8 supergravity is non-renormalizable, based on the existence of possible counterterms at high enough order.
www.math.columbia.edu /~woit/wordpress/?p=485   (741 words)

  
 Zwiebach, Barton (1983-05-19) Use of superspace geometry to find all supergravity theories: case of N=4 and SO(4) ...
The main subject of this thesis is the study of the N = 4 supergravity theories.
It is found that the general solution to the unconstrained Bianchi Identities, with the field content of N = 4 supergravity, are equivalent to the known SO(4) and SU(4) supergravities up to field redefinitions.
The SO(4) supergravity is gauged with two coupling constants and a new theory with positive cosmological constant and spontaneous breaking of the four supersymmetries is found.
etd.caltech.edu /etd/available/etd-12072004-143533   (210 words)

  
 IngentaConnect Fayet-Iliopoulos terms in supergravity and cosmology   (Site not responding. Last check: )
We clarify the structure of N = 1 supergravity in 1+3 dimensions with constant Fayet–Iliopoulos (FI) terms.
Therefore the D-term inflation model in supergravity with constant FI terms has to be revisited.
We study such string solutions of supergravity with constant FI terms with one half supersymmetry unbroken and explain some of the puzzling properties of the zero modes around cosmic strings, such as the difference between the numbers of fermionic and bosonic modes.
www.ingentaconnect.com /content/iop/cqg/2004/00000021/00000013/art00005   (354 words)

  
 Wess, J. and Bagger, J.: Supersymmetry and Supergravity: (Revised Edition).   (Site not responding. Last check: )
This widely acclaimed introduction to N = 1 supersymmetry and supergravity is aimed at readers familiar with relativistic quantum field theory who wish to learn about the supersymmetry algebra.
In this new volume Supersymmetry and Supergravity has been greatly expanded to include a detailed derivation of the most general coupling of super-symmetric gauge theory to supergravity.
It emphasizes the logical coherence of the subject and should appeal to physicists whose interests range from the mathematical to the phenomenological.
press.princeton.edu /titles/2149.html   (210 words)

  
 APPLIED N=1 SUPERGRAVITY
These lectures give an elementary introduction to the important recent developments of the applications of N=1 supergravity to the construction of unified models of elementary particle interactions.
Topics covered include couplings of supergravity with matter, spontaneous symmetry breaking and the super-higgs effect, construction of supergravity unified models, and the phenomenon of SU(2) ×; U(1) electroweak-symmetry breaking by supergravity.
Experimental consequences of N-1 supergravity unified theory, in particular, the possible supersymmetric decays of the W
www.worldscibooks.com /physics/0094.html   (138 words)

  
 The gravity–gauge theory correspondence   (Site not responding. Last check: )
At finite N, supergravity is expected to receive quantum corrections that qualitatively modify dynamics, and indeed the reduction of wave functions on the sphere yield more particles than exist chiral operators.
The D0-brane theory is approximated by perturbative Yang Mills at high energies, and by 11 dimensional supergravity in a particular background at lower energies.
String theory in flat space is understood beyond the supergravity approximation because the quantum description of the dynamics of a single string in flat space exists, i.e.
www.ias.ac.in /currsci/dec251999/articles22.htm   (6941 words)

  
 Computations in Riemann Geometry - BPS Membranes in Supergravity
A supergravity theory is a gauge theory of supersymmetry [van Nieuwenhuizen], [Duff-86].
We will approach them from the point of view of 11 dimensional supergravity, since all other supergravity theories can be obtained from it through dimensional reduction, and it has the simplest super-multiplet.
The first thing to say about supergravity theories is that they can be approached as purely classical theories, with the proviso that there is no contradiction in the idea of a classical fermionic field.
www.rwc.uc.edu /koehler/crg/sugra.html   (1700 words)

  
 Supergravity (E16)   (Site not responding. Last check: )
Supergravity (E16) Supergravity extends the supersymmetry course in the Lent term but the inclusion of gravity.
This means that supersymmetry becomes a local symmetry and could provide a low energy description of string theory.
P.C. West, An Introduction to supersymmetry and supergravity.
www.maths.cam.ac.uk /postgrad/casm/descriptions/node78.html   (117 words)

Try your search on: Qwika (all wikis)

Factbites
  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.