Results 31 to 40 of about 19,573 (204)
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
wiley +1 more source
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
wiley +1 more source
Inflationary Universe from Anomaly‐Free F(R)‐Gravity
Advances in High Energy Physics, Volume 2022, Issue 1, 2022., 2022 By adding a three‐dimensional manifold to an eleven‐dimensional manifold in supergravity, we obtain the action of F(R)‐gravity and find that it is anomaly‐free. We calculate the scale factor of the inflationary universe in this model and observe that it is related to the slow‐roll parameters.
Aroonkumar Beesham +2 more
wiley +1 more source
Hidden inflaton dark matter [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 36 pages, 11 figures. v2: Two appendices, discussion, and references added.
Almeida, Juan P. Beltrán +3 more
openaire +2 more sources
Inflaton particles in reheating [PDF]
Physics Letters B, 2000 14 pages, 4 figures;code corrected,figures and some conclusions ...
Henriques, A. B., Moorhouse, R. G.
openaire +2 more sources
Preheating of the nonminimally coupled inflaton field [PDF]
, 1999 We investigate preheating of an inflaton field $\phi$ coupled nonminimally to a spacetime curvature. In the case of a self-coupling inflaton potential $V(\phi)=\lambda \phi^4/4$, the dynamics of preheating changes by the effect of the negative $\xi$.
A. Campos +57 more
core +2 more sources
Inflation without inflaton(s) [PDF]
Journal of Cosmology and Astroparticle Physics, 2007 We propose a model for early universe cosmology without the need for fundamental scalar fields. Cosmic acceleration and phenomenologically viable reheating of the universe results from a series of energy transitions, where during each transition vacuum energy is converted to thermal radiation.
Watson, Scott +3 more
openaire +3 more sources
Physical Review D, 2022 We study the possibility that, after inflation, the inflaton reaches thermal equilibrium with the Standard Model thermal bath and eventually freezes-out in the non-relativistic regime. When the inflaton decay is the sole source of (non-thermal) dark matter, its relic density is automatically suppressed.
Oleg Lebedev +3 more
openaire +3 more sources
Reheating in nonminimal derivative coupling model [PDF]
, 2013 We consider a model with nonminimal derivative coupling of inflaton to gravity. The reheating process during rapid oscillation of the inflaton is studied and the reheating temperature is obtained.
A. Banijamali +10 more
core +1 more source
Gravitino Overproduction in Inflaton Decay [PDF]
AIP Conference Proceedings, 2006 Most of the inflation models end up with non-vanishing vacuum expectation values of the inflaton fields in the true vacuum, which induce, in general, nonvanishing auxiliary field G_ for the inflaton potential in supergravity. We show that the presence of nonzero G_ gives rise to inflaton decay into a pair of the gravitinos and are thereby severely ...
Kawasaki, M. +2 more
openaire +3 more sources