| Texto completo | |
| Autor(es): |
Velten, Hermano
;
Gomes, Syrios
;
Busti, Vinicius C.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 97, n. 8, p. 8-pg., 2018-04-23. |
| Resumo | |
We revisit a model-independent estimator for cosmic acceleration based on type Ia supernovae distance measurements. This approach does not rely on any specific theory for gravity, energy content, nor parametrization for the scale factor or deceleration parameter and is based on falsifying the null hypothesis that the Universe never expanded in an accelerated way. By generating mock catalogs of known cosmologies, we test the robustness of this estimator, establishing its limits of applicability. We detail the pros and cons of such an approach. For example, we find that there are specific counterexamples in which the estimator wrongly provides evidence against acceleration in accelerating cosmologies. The dependence of the estimator on the H-0 value is also discussed. Finally, we update the evidence for acceleration using the recent UNION2.1 and Joint Light-Curve Analysis samples. Contrary to recent claims, available data strongly favor an accelerated expansion of the Universe in complete agreement with the standard Lambda CDM model. (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 |
| Processo FAPESP: | 16/17271-5 - Aglomerados de galáxias como sondas cosmológicas: calibração da relação massa-riqueza |
| Beneficiário: | Vinicius Consolini Busti |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |