Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/88259
Type: Artigo de periódico
Title: Observables And Unobservables In Dark Energy Cosmologies
Author: Amendola L.
Kunz M.
Motta M.
Saltas I.D.
Sawicki I.
Abstract: The aim of this paper is to answer the following two questions: (1) Given cosmological observations of the expansion history and linear perturbations in a range of redshifts and scales as precise as is required, which of the properties of dark energy could actually be reconstructed without imposing any parameterization? (2) Are these observables sufficient to rule out not just a particular dark energy model, but the entire general class of viable models comprising a single scalar field? This paper bears both good and bad news. On one hand, we find that the goal of reconstructing dark energy models is fundamentally limited by the unobservability of the present values of the matter density Ωm0, the perturbation normalization σ8 as well as the present matter power spectrum. On the other, we find that, under certain conditions, cosmological observations can nonetheless rule out the entire class of the most general single scalar-field models, i.e., those based on the Horndeski Lagrangian. © 2013 American Physical Society.
Editor: 
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.87.023501
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84871887761&partnerID=40&md5=dadcb8351e467271e3bb3548ea2657a8
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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