Results 11 to 20 of about 21,399,211 (273)

$R_b$ 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
X. Wang, José L. López, D.V. Nanopoulos   +2 more
core   +5 more sources

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   +4 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 ...
S. Ferrara, R. Kallosh, Andrei Linde, M. Porrati   +3 more
semanticscholar   +4 more sources

Building models of inflation in no-scale supergravity [PDF]

International Journal of Modern Physics D, 2020
After reviewing the motivations for cosmological inflation formulated in the formalism of supersymmetry, we argue that the appropriate framework is that of no-scale supergravity.
J. Ellis, M. A. Garcia, N. Nagata, D. Nanopoulos, K. Olive, S. Verner   +5 more
semanticscholar   +6 more sources

Supergravity Unified Models [PDF]

, 1997
The development of supergravity unified models and their implications for current and future experiments are discussed.Comment: Latex, 21 pages, to appear in book "Perspectives on Supergravity", World Scientific, Editor G.
Arnowitt, R., Nath, Pran
core   +2 more sources

Supergravity based inflation models: a review [PDF]

Classical and Quantum Gravity, 2011
In this review, we discuss inflation models based on supergravity. After explaining the difficulties in realizing inflation in the context of supergravity, we show how to evade such difficulties. Depending on types of inflation, we give concrete examples,
't Hooft G, Allahverdi R, Antusch S, Arkani-Hamed N, Bailin D, Ballesteros G, Barvinsky A O, Barvinsky A O Kamenshchik A Y Kiefer C Starobinsky A A Steinwachs C F, Bezrukov F, Bezrukov F Magnin A Shaposhnikov M Sibiryakov S, Binetruy P, Chiba T, Chiba T, Dunkley J, Endo M, Ferrara S Kallosh R Linde A Marrani A Van Proeyen A, Germani C, Goncharov A S, Hwang J C, Jeannerot R, Jeannerot R, Kallosh R, Kallosh R Linde A Rube T, Kamada K Kobayashi T Yamaguchi M Yokoyama J, Kaneda S, Ketov S V, Ketov S V Starobinsky A A, Khalil S Rehman M U Shafi Q Zaakouk E A, Khoury J Lehners J L Ovrut B, Kobayashi T Takahashi F, Komatsu E, Lee H M, Lyth D H, Masahide Yamaguchi, Mazumdar A Rocher J, McAllister L Silverstein E Westphal A, Nakayama K, Nakayama K, Nakayama K Takahashi F, Peiris H V, Rocher J, Rocher J, Sato K, Starobinsky A A, Starobinsky A A, Suyama T Takahashi T Yamaguchi M Yokoyama S, Wess J   +46 more
core   +2 more sources

N=2 supergravity models with stable de Sitter vacua [PDF]

, 2003
In the present talk I shall review the construction of N=2 supergravity models exhibiting stable de Sitter vacua. These solutions represent the first instance of stable backgrounds with positive cosmological constant in the framework of extended ...
Andrianopoli L, Antoine Van Proeyen, Castellani L, de Wit B, Fré P, Gibbons G W, Hull C M, Hull C M, Kallosh R, Kallosh R, Linde A D, Mario Trigiante, Pietro Fr, Sievers J L   +13 more
core   +4 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   +2 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   +2 more sources

ON QUANTUM MODEL OF SUPERGRAVITY COMPENSATOR [PDF]

Modern Physics Letters A, 1996
A new N=1 superfield model in D=4 flat superspace is suggested. This model describes dynamics of chiral compensator and can be treated as a low-energy limit of D=4, N=1 quantum superfield supergravity. Renormalization structure of this model is studied and one-loop counterterms are calculated. It is shown that the theory is infrared-free. An effective
I. L. Buchbinder, A. Yu. Petrov
openalex   +4 more sources