Results 31 to 40 of about 20,263 (249)
Domestic corpuscular inflaton [PDF]
International Journal of Geometric Methods in Modern Physics, 2019 The aim of this paper is to provide a more precise description of the paradigm of corpuscular slow-roll inflation, which was previously introduced by Casadio et al. in [Corpuscular slow-roll inflation, Phys. Rev. D 97 (2018) 024041]. Specifically, we start by expanding the Starobinsky theory on a curved background and then infer the number and nature ...
Giugno A., Giusti A.
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Dynamical Analysis in Chameleon Dark Energy
Fortschritte der Physik, Volume 71, Issue 8-9, September 2023., 2023 Abstract A detailed analysis of the phase‐space for the field equations in scalar field cosmology with a chameleon cosmology in a spatially flat Friedmann–Lemaître–Robertson–Walker spacetime is presented. For the matter source it is assumed that it is an ideal gas with a constant equation of state parameter, while for the scalar field potential and the
Andronikos Paliathanasis
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Inflation without inflatons [PDF]
Physical Review D, 2006 11 pages, 2 figures. Revised version, accepted for publication in Phys.
R. Opher, Ana Pelinson
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Cosmic Inflation and Genetic Algorithms
Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023 Abstract Large classes of standard single‐field slow‐roll inflationary models consistent with the required number of e‐folds, the current bounds on the spectral index of scalar perturbations, the tensor‐to‐scalar ratio, and the scale of inflation can be efficiently constructed using genetic algorithms.
Steve A. Abel +3 more
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Physics Letters B, 2010 If the cosmological inflationary scenario took place in the cosmic landscape in string theory, the inflaton, the scalar mode responsible for inflation, would have meandered in a complicated multi-dimensional potential. We show that this meandering property naturally leads to many e-folds of inflation, a necessary condition for a successful inflationary
Tye, Henry, Xu, Jiajun
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Who's Afraid of the Supersymmetric Dark? The Standard Model vs Low‐Energy Supergravity
Fortschritte der Physik, Volume 70, Issue 7-8, August 2022., 2022 Abstract Use of supergravity equations in astronomy and late‐universe cosmology is often criticized on three grounds: (i) phenomenological success usually depends on the supergravity form for the scalar potential applying at the relevant energies; (ii$ii$) the low‐energy scalar potential is extremely sensitive to quantum effects involving very massive ...
C.P. Burgess, F. Quevedo
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Quintessence and the Swampland: The Numerically Controlled Regime of Moduli Space
Fortschritte der Physik, Volume 70, Issue 4, April 2022., 2022 Abstract We provide a detailed discussion of the main theoretical and phenomenological challenges of quintessence model building in any numerically controlled regime of the moduli space of string theory. We argue that a working quintessence model requires a leading order non‐supersymmetric (near) Minkowski vacuum with an axionic flat direction.
Michele Cicoli +3 more
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Constraint on the Higgs‐Dilaton Potential via Warm Inflation in Two‐Time Physics
Advances in High Energy Physics, Volume 2022, Issue 1, 2022., 2022 Within the SP(2, R) symmetry, the two‐time model (2T model) has six dimensions with two dimensions of time and the dilaton field that can be identified as inflaton in a warm inflation scenario with potential of the form ~ϕ4. From that consideration, we derive the range of parameters for the Higgs‐Dilaton potential, the coupling constant between Higgs ...
Vo Quoc Phong +2 more
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Inflaton decay in supergravity [PDF]
Physical Review D, 2007 41 pages, 5 figures. v2: references and supplementary sections added, a version to appear in Phys.
Endo, M., Takahashi, F., Yanagida, T. T.
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Reheating after inflaton fragmentation
Journal of Cosmology and Astroparticle Physics, 2023 AbstractIn the presence of self-interactions, the post-inflationary evolution of the inflaton field is driven into the non-linear regime by the resonant growth of its fluctuations. The once spatially homogeneous coherent inflaton is converted into a collection of inflaton particles with non-vanishing momentum.
Garcia, Marcos A. G., Pierre, Mathias
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