Preheating after inflation may lead to non-thermal phase transitions with symmetry restoration. These phase transitions may occur even if the total energy density of fluctuations produced during reheating is relatively small as compared with the vacuum energy in the state with restored symmetry. As a result, in some inflationary models one encounters a secondary, non-thermal stage of inflation ...

The production of any multilayer structure begins with the development technological documentation, which describes, among other things, temperature regimes during their manufacture. Conventionally, process polymerization can be divided into three stages: preheating, stabilization and cooling. paper presents results a numerical calculation fields in composite honeycomb filler its manufacture by...

Abstract We consider dark matter production during the inflaton oscillation epoch. It is conceivable that renormalizable interactions between and may be negligible. In this case, leading role played by higher dimensional operators generated gravity thus suppressed Planck scale. focus on dim-6 study corresponding particle in perturbative non-perturbative regimes. find rate dominated non-derivati...

When the interbrane separation in the compact Randall-Sundrum model is stabilized using the Goldberger-Wise mechanism, a potential is generated for the four-dimensional field, the radion, that encodes this separation. Coherent oscillations of the radion in the early universe will produce an exponential growth in the number of brane particles due to parametric amplification. We describe the cond...

Symmetry restoration processes during the non-equilibrium stage of “preheating” after inflation is studied. It is shown that symmetry restoration is very efficient when the majority of created particles are concentrated at energies much smaller than the temperature T in equilibrium. The strength of symmetry restoration measured in terms of the equivalent temperature can exceed T by many orders ...

Leptogenesis constitues a very simple scenario to achieve the baryon asymmetry that we observe today. It requires only the presence of right handed neutrinos (which arise very naturally in many extensions of the Standard Model) and depends crucially on the mechanism responsible for their production. In particular, when their mass exceeds the inflaton mass (10 GeV in chaotic inflation) only non ...

We discuss the evolution of linear perturbations about a Friedmann– Robertson–Walker background metric, using only the local conservation of energy– momentum. We show that on sufficiently large scales the curvature perturbation on spatial hypersurfaces of uniform-density is constant when the non-adiabatic pressure perturbation is negligible. We clarify the conditions under which super-horizon c...