Results 1 to 10 of about 1,034,510 (257)

Quintessence models in Supergravity [PDF]

Physical Review D, 2000
Scalar field models of quintessence typically require that the expectation value of the field today is of order the Planck mass, if we want them to explain the observed acceleration of the Universe.
A. Albrecht, A. G. Riess, A. Masiero, A. R. Liddle, B. de Carlos, B. Ratra, C. Kolda, C. Wetterich, E. J. Copeland, E. J. Copeland, F. Rosati, G. Huey, I. Affleck, I. Affleck, I. Zlatev, J. A. Casas, J. A. Frieman, K. Choi, L. López, M. Peloso, M. S. Turner, N. A. Bahcall, N. J. Nunes, P. Binétruy, P. Binétruy, P. Binétruy, P. Brax, P. Brax, P. de Bernardis, P. G. Ferreira, P. G. Ferreira, P. J. E. Peebles, P. J. E. Peebles, P. J. Steinhardt, R. R. Caldwell, S. Perlmutter, S. Podariu, T. Barreiro, T. Barreiro, T. Barreiro, T. R. Taylor   +40 more
core   +7 more sources

Supergravity Unified Models [PDF]

, 1997
The development of supergravity unified models and their implications for current and future experiments are discussed.
Arnowitt, R., Nath, Pran
arxiv   +7 more sources

Fine-Tuning Constraints on Supergravity Models [PDF]

Physics Letters B, 1999
We discuss fine-tuning constraints on supergravity models. The tightest constraints come from the experimental mass limits on two key particles: the lightest CP even Higgs boson and the gluino. We also include the lightest chargino which is relevant when
Carena, Dimopoulos, G.L. Kane, Kane, M. Bastero-Gil, Martin, Pierce, S.F. King   +7 more
core   +4 more sources

On Asymmetric Orbifolds and the D=5 No-modulus Supergravity [PDF]

Phys.Lett. B523 (2001) 351-356, 2001
We examine whether any type II asymmetric orbifolds have the same massless spectrum as the dimensional reduction of D=5 simple supergravity, which, besides the eleven-dimensional supergravity, is the only known supergravity above four dimensions with no moduli.
Bouwknegt, Carter, Chamseddine, Cremmer, Cremmer, Cremmer, Dabholkar, Damour, Das, de Wit, Dine, Dine, Harvey, Kumar, Lerche, Luciani, Mizoguchi, Mizoguchi, Narain, Narain, Nicolai, Papadopoulos, Shun'ya Mizoguchi, Townsend, Vafa, Witten   +25 more
arxiv   +5 more sources

Minimal Supergravity Models of Inflation [PDF]

Physical Review D, 2013
We present a superconformal master action for a class of supergravity models with one arbitrary function defining the Jordan frame. It leads to a gauge-invariant action for a real vector multiplet, which upon gauge fixing describes a massive vector ...
Ferrara, Sergio, Kallosh, Renata, Linde, Andrei, Porrati, Massimo   +3 more
core   +3 more sources

Chromo-natural inflation in Supergravity [PDF]

Physics Letters B, 2018
We present supergravity realizations of chromo-natural inflationary models. We show that by using superpotentials with “imaginary” holomorphic functions of the inflaton one can obtain effective theories of inflation that are also consistent truncations ...
Gianguido Dall'Agata
doaj   +2 more sources

Glueball Mass Spectra and Other Issues for Supergravity Duals of QCD Models [PDF]

, 1998
We derive WKB expressions for glueball masses of various finite temperature supergravity models. The results are very close to recent numerical computations.
Minahan, Joseph A.
core   +5 more sources

$R_b$ in supergravity models [PDF]

, 1995
We compute the supersymmetric contribution to $R_{b}\equiv \Gamma (Z\to b{\bar b})/\Gamma (Z\to {\rm hadrons})$ in a variety of supergravity models. We find $R^{\rm susy}_b\lsim0.0004$, which does not shift significantly the Standard Model prediction
Lopez, J., Nanopoulos, D., Wang, X.
core   +3 more sources

Supergravity Models [PDF]

arXiv, 1993
Theoretical and experimental motivations behind supergravity grand unified models are described. The basic ideas of supergravity, and the origin of the soft breaking terms are reviewed. Effects of GUT thresholds and predictions arising from models possessing proton decay are discussed.
Arnowitt, R., Nath, Pran
arxiv   +3 more sources

Developments in Supergravity Unified Models [PDF]

, 2010
A review is given of developments in supergravity unified models proposed in 1982 and their implications for current and future experiment are discussed.Comment: 24 pages, 1 figure.
Arnowitt, Richard, Nath, Pran
core   +3 more sources