Eur. Phys. J. Plus (2016) 131: 25
https://doi.org/10.1140/epjp/i2016-16025-7

Regular Article

Varying ghost dark energy and particle creation

Institute for Physical Research, National Academy of Sciences, Ashtarak, Republic of Armenia

^* e-mail: khurshudyan@yandex.ru

Received: 19 November 2015
Accepted: 21 December 2015
Published online: 2 February 2016

Abstract

One of the models of dark energy is the ghost dark energy, which has a geometrical origin. Recently, a certain type of phenomenological modification of ghost dark energy has been suggested which motivated us for this work. The goal of this paper is twofold. First, we would like to study the cosmological scenario involving interacting varying ghost dark energy. A cosmographic analysis of a non-interacting model is also performed. Then, we study the particle creation following the straight analogy between quantization in Minkowski background and canonical quantization of a scalar field in curved dynamical backgrounds. Particular attention will be paid to massless-particle production from a radiation-dominated universe (according to our toy model) which evolves to our large-scale universe. Constraints on the parameters of the models obtained during the cosmographic analysis did allow to demonstrate the possibility of a massless-particle creation in a radiation-dominated universe.