| Texto completo | |
| Autor(es): |
Busti, Vinicius C.
;
Clarkson, Chris
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Cosmology and Astroparticle Physics; v. N/A, n. 5, p. 11-pg., 2016-05-01. |
| Resumo | |
One of the key issues in cosmology is to establish the nature of dark energy, and to determine whether the equation of state evolves with time. When estimating this from distance measurements there is a degeneracy with the matter density. We show that there exists a simple function of the dark energy equation of state and its first derivative which is independent of this degeneracy at all redshifts, and so is a much more robust determinant of the evolution of dark energy than just its derivative. We show that this function can be well determined at low redshift from supernovae using Gaussian Processes, and that this method is far superior to a variety of parameterisations which are also subject to priors on the matter density. This shows that parametrised models give very biased constraints on the evolution of dark energy. (AU) | |
| Processo FAPESP: | 14/21098-1 - Cosmologia de precisão com o Dark Energy Survey |
| Beneficiário: | Vinicius Consolini Busti |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |