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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.)

Is cosmography a useful tool for testing cosmology?

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Autor(es):
Busti, Vinicius C. [1, 2] ; de la Cruz-Dombriz, Alvaro [1, 3] ; Dunsby, Peter K. S. [1, 4] ; Saez-Gomez, Diego [5, 1, 6]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Cape Town, Dept Math & Appl Math, ACGC, ZA-7701 Cape Town - South Africa
[2] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, BR-05508090 Sao Paulo, SP - Brazil
[3] Univ Complutense Madrid, Dept Fis Teor 1, E-28040 Madrid - Spain
[4] South African Astron Observ, ZA-7925 Cape Town - South Africa
[5] Univ Lisbon, Fac Ciencias, Dept Fis, P-1749016 Lisbon - Portugal
[6] Univ Lisbon, Fac Ciencias, Inst Astrofis & Ciencias Espaco, P-1749016 Lisbon - Portugal
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 92, n. 12 DEC 11 2015.
Citações Web of Science: 20
Resumo

Model-independent methods in cosmology have become an essential tool to deal with an increasing number of theoretical alternatives for explaining the late-time acceleration of the Universe. In principle, this provides a way of testing the cosmological concordance (or Lambda CDM) model under different assumptions and ruling out whole classes of competing theories. One such model-independent method is the so-called ``cosmographic approach{''}, which relies only on the homogeneity and isotropy of the Universe on large scales. We show that this method suffers from many shortcomings, providing biased results depending on the auxiliary variable used in the series expansion, and is unable to rule out models or adequately reconstruct theories with higher-order derivatives in either the gravitational or matter sector. Consequently, in its present form, this method seems unable to provide reliable or useful results for cosmological applications. (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