We study preheating in DBI hybrid inflation. Preheating occurs since the matter fields are non-minimally coupled to the inflaton. Despite the coupling being small, preheating happens as a narrow parametric resonance in which matter fields and inflaton modes are exponentially created. We show that, within the approximations used, the process is very efficient at late times. The resonance stage g...

We discuss the interaction between perturbations in the inflaton and the background during the preheating phase in simple inflationary models. By numerically solving the Einstein field equations we are able to assess the impact of non-linear gravitational effects on preheating, and to assess the accuracy of perturbative discussions of the preheating epoch.

We examine the effect of preheating of the intergalactic medium on galaxy formation using cosmological hydrodynamical simulations. By performing simulations both with and without a simple model for preheating, we analyse and compare the angular momentum distributions of the dark matter and the baryons. Preheating unbinds baryons from their dark matter haloes, yielding a baryonic mass fraction t...

We use a one-dimensional hydrodynamical code to investigate the effects of preheating on gas accretion and cooling in cold dark matter halos. In the absence of radiative cooling, preheating reduces the amount of gas that can be accreted into a halo, and the accreted gas fraction is determined by the ratio of the initial specific entropy of the gas to the virial entropy of the halo, Sph/Sv. In t...

The chilled casting method is widely used in the metal industry to accelerate mold's cooling rate. This very suitable for surface hardening by depositing elements contained chill material onto of object being cast. One factors that influence hardness characteristics diffusion temperature. study aims determine microhardness, layer thickness, and element on surface. main produced into Y-Block duc...

The quality of Liquid Composite Molding (LCM) manufactured components is strictly related to the fibrous preform impregnation. As Darcy’s law suggests, resin flow influenced by pressure gradient, geometrical features reinforcement, and viscosity. former two parameters are dictated requirements component other constraints; therefore, they hardly modifiable during process. Resin preheating increa...

Purpose. To establish regularities of changes in sand-sodium-silicate mixtures (SSSM) relative water resistance, structured by steam-microwave solidification method (SMS), on their structuring parameters and sodium silicate solute (SSS) dissolution conditions. Methodology. Technical purity water, SSS with 2.83.0 modulus, quartz sand 0.23 mm average particle size were used this work. Studies car...

Small heat shock proteins usually exhibit increased chaperone-like activity either at high temperatures or after preheating. However, the activation mechanism is still unclear. In the current study, we investigated the preheating-activation process of Mj HSP16.5, using various biophysical methods. Although Mj HSP16.5 was reported to be the most monodispersed sHSPs, we found that the newly purif...

Analytic results are presented for preheating in both flat and open models of chaotic inflation, for the case of massless inflaton decay into further inflaton quanta. It is demonstrated that preheating in both these cases closely resembles that in Minkowski spacetime. Furthermore, quantitative differences between preheating in spatially flat and open models of inflation remain of order 10 for t...