https://doi.org/10.1140/epjc/s10052-008-0566-x
Regular Article - Theoretical Physics
First-order formalism for dark energy and dust
1
Departamento de Física, Universidade Federal da Paraíba, 58051-970, João Pessoa, Paraíba, Brazil
2
Instituto de Física Teórica, UNESP, Rua Pamplona 145, 01405-900, São Paulo, Brazil
* e-mail: bazeia@fisica.ufpb.br
Received:
25
October
2007
Revised:
18
January
2008
Published online:
11
March
2008
This work deals with a first-order formalism for dark energy and dust in standard cosmology, for models described by a real scalar field in the presence of dust in spatially flat space. The field dynamics may be standard or tachyonic, and we show how the equations of motion can be solved by first-order differential equations. We investigate a model to illustrate how the dustlike matter may affect the cosmic evolution using this framework.
© Springer-Verlag , 2008
