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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Dodging the dark matter degeneracy while determining the dynamics of dark energy

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Autor(es):
Busti, Vinicius C. [1, 2, 3] ; Clarkson, Chris [1, 2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Cape Town, Dept Math & Appl Math, ZA-7701 Cape Town - South Africa
[2] Univ Cape Town, Astrophys Cosmol & Grav Ctr, ZA-7701 Cape Town - South Africa
[3] Univ Sao Paulo, Dept Fis Matemat, Rua Matao 1371, Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Cosmology and Astroparticle Physics; n. 5 MAY 2016.
Citações Web of Science: 4
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
Linha de fomento: Bolsas no Brasil - Pós-Doutorado