Creation of the Nonconformal Scalar Particles in Nonstationary Metric

TL;DR

This paper investigates the creation of nonconformal scalar particles in nonstationary, anisotropic, and nonhomogeneous spacetimes, deriving a modified Hamiltonian and analyzing particle densities in cosmological models.

Contribution

It introduces a modified Hamiltonian for nonconformal scalar fields in complex spacetimes and examines particle creation in various cosmological backgrounds.

Findings

Particle densities for conformal and nonconformal scalars coincide in Friedmann radiative-dominant universe.

A modified Hamiltonian approach is developed for nonconformal scalar fields.

Particle creation is analyzed in nonstationary, anisotropic, and nonhomogeneous metrics.

Abstract

The nonconformal scalar field is considered in N-dimensional space-time with metric which includes, in particular, the cases of nonhomogeneous spaces and anisotropic spaces of Bianchi type-I. The modified Hamiltonian is constructed. Under the diagonalization of it the energy of quasiparticles is equal to the oscillator frequency of the wave equation. The density of particles created by nonstationary metric is investigated. It is shown that the densities of conformal and nonconformal particles created in Friedmann radiative-dominant Universe coincide.