Results 1 to 10 of about 41,192 (146)

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
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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
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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
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$R_b$ 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.
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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
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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
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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
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Constraints on Supergravity Chaotic Inflationary Models [PDF]

Physics Letters B, 1995
We discuss, in the context of $N=1$ hidden sector non-minimal supergravity chaotic inflationary models, constraints on the parameters of a polynomial superpotential resulting from existing bounds on the reheating temperature and on the amplitude of the ...
Bento, M. C., Bertolami, O.
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1D Supergravity FLRW Model of Starobinsky [PDF]

Universe, 2021
We study two homogeneous supersymmetric extensions for the f(R) modified gravity model of Starobinsky with the FLRW metric. The actions are defined in terms of a superfield R that contains the FLRW scalar curvature. One model has N = 1 local supersymmetry, and its bosonic sector is the Starobinsky action; the other action has N = 2, its bosonic sector ...
Nephtalí E. Martínez-Pérez, Cupatitzio Ramírez-Romero, Víctor M. Vázquez-Báez   +2 more
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Baryogenesis in supergravity inflationary models [PDF]

Physics Letters B, 1985
Realistic N=1 supergravity theories with a gravitino mass of order 1 TeV require a period of inflation to dilute the gravitino abundance. Moreover, if the gravitino is unstable the reheat temperature is bounded to be no greater than O(108 GeV). We show that such models may still have acceptable rates of baryosynthesis and discuss possible mechanisms.
Department of Theoretical Physics Keble Road, Oxford OX1 3NP, UK ( host institution ), Coughlan, G.D. ( author ), Ross, G.G. ( author ), Holman, R. ( author ), Ramond, P. ( author ), Ruiz-Altaba, M. ( author ), Valle, J.W.F. ( author )   +6 more
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