| Texto completo | |
| Autor(es): |
Bernardini, A. E.
[1]
Número total de Autores: 1
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review D; v. 80, n. 10, p. 103522, 2009. |
| Citações Web of Science: | 7 |
| Resumo | |
A unified treatment of mass varying dark matter coupled to cosmonlike dark energy is shown to result in effective generalized Chaplygin gas (GCG) scenarios. The mass varying mechanism is treated as a cosmon field inherent effect. Coupling dark matter with dark energy allows for reproducing the conditions for the present cosmic acceleration and for recovering the stability resulting from a positive squared speed of sound c(s)(2), as in the GCG scenario. The scalar field mediates the nontrivial coupling between the dark matter sector and the sector responsible for the accelerated expansion of the Universe. The equation of state of perturbations is the same as that of the background cosmology so that all the effective results from the GCG paradigm are maintained. Our results suggest the mass varying mechanism, when obtained from an exactly soluble field theory, as the one responsible for the stability issue and for the cosmic acceleration of the Universe. (AU) | |
| Processo FAPESP: | 08/50671-0 - Aplicações em mecânica quântica relativística e teoria de campos: oscilações quânticas, campos fermiônicos, quiralidade e equação de Dirac; sistemas com violação de Lorentz, energia escura e neutrinos cosmológicos; dinâmica relativística no efeito de tunelamento; zitterbewegung-like em sistemas fermiônicos em física da matéria condensada |
| Beneficiário: | Alex Eduardo de Bernardini |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |