Squeezed Coherent State Representation of Scalar Field and Particle Production in the Early Universe


Autoria(s): Santhosh Kumar, G; Kuriakose, V C
Data(s)

21/07/2014

21/07/2014

22/06/1999

Resumo

The present work is an attempt to explain particle production in the early univese. We argue that nonzero values of the stress-energy tensor evaluated in squeezed vacuum state can be due to particle production and this supports the concept of particle production from zero-point quantum fluctuations. In the present calculation we use the squeezed coherent state introduced by Fan and Xiao [7]. The vacuum expectation values of stressenergy tensor defined prior to any dynamics in the background gravitational field give all information about particle production. Squeezing of the vacuum is achieved by means of the background gravitational field, which plays the role of a parametric amplifier [8]. The present calculation shows that the vacuum expectation value of the energy density and pressure contain terms in addition to the classical zero-point energy terms. The calculation of the particle production probability shows that the probability increases as the squeezing parameter increases, reaches a maximum value, and then decreases.

International Journal of Theoretical Physics, Vol. 39, No. 2, 2000

Cochin University of Science and Technology

Identificador

http://dyuthi.cusat.ac.in/purl/4148

Idioma(s)

en

Publicador

Plenum Publishing Corporation

Palavras-Chave #particle production #stress-energy tensor #zero-point quantum fluctuations #gravitational field #parametric amplifier
Tipo

Article