In numerical simulations studying preheating in the classical approximation there is the problem how to derive the classical initial conditions from the quantum vacuum fluctuations. In past treatments, the initial conditions often put an energy density into the classical field of order of the cutoff, leading to a divergent temperature after thermalization. We suggest a solution to the problem w...

We study the generation of magnetic fields during preheating within a scenario of hybrid inflation at the electroweak scale. We find that the nonperturbative and strongly out-of-equilibrium process of generation of magnetic fields with a nontrivial helicity occurs along the lines predicted by Vachaspati many years ago. The magnitude (rho_{B}/rho_{EW} approximately 10{-2}) and correlation length...

To enhance the performance of Babbitt–steel bimetallic composites, bismuth (Bi) was incorporated into Tin (Sn)-interlayer. composites were created using liquid–solid compound casting method in this study. Sn–Bi interlayer alloys with varying levels Bi (1, 2, 3, and 4 wt.%) created. The Babbitt-steel composite’s bonding strength interfacial microstructure examined relation to Sn-Bi alloys. struc...

In this talk 1 recent developments of the theory of preheating after inflation are briefly reviewed. In inflationary cosmology, the particles constituting the Universe are created after inflation due to their interaction with moving inflaton field(s) in the process of reheating. In inflationary models motivated by supergravity, both bosons and fermions are created. In the bosonic sector, the le...

In inflationary cosmology, the particles constituting the Universe are created after inflation in the process of reheating due to the interaction with the oscillating inflaton field. We briefly review the basics of the slow reheating, and the stage of fast preheating, when the particles are created explosively in the regime of parametric resonance. The non-perturbative, out-of-equilibrium chara...

The origin of the matter-antimatter asymmetry remains one of the most fundamental problems of cosmology. In this talk I present a novel scenario for baryogenesis at the electroweak scale, without the need for a first order phase transition. It is based on the out of equilibrium resonant production of long wavelength Higgs and gauge configurations, at the end of a period of inflation, which indu...

Abstract Obtaining a strong bond between aluminum and steel is challenging due to poor wettability melt brittle intermetallic phases forming in the interface. In this research, novel coating method, namely hot dipping of Sn, has been developed treat insert surfaces. Results show that without preheating mold or Sn-coated insert, thin, crack-free, continuous metallurgical bonding layer was achiev...