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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gauging the cosmic acceleration with recent type Ia supernovae data sets

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Velten, Hermano [1, 2] ; Gomes, Syrios [1, 2] ; Busti, Vinicius C. [3, 4]
Total Authors: 3
[1] Univ Fed Espirito Santo, CCE, Nucleo Cosmoufes, BR-29075910 Vitoria, ES - Brazil
[2] Univ Fed Espirito Santo, CCE, Dept Fis, BR-29075910 Vitoria, ES - Brazil
[3] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 - USA
[4] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Physical Review D; v. 97, n. 8 APR 23 2018.
Web of Science Citations: 1

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)

FAPESP's process: 14/21098-1 - Precision cosmology with the Dark Energy Survey
Grantee:Vinicius Consolini Busti
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 16/17271-5 - Galaxy clusters as cosmological probes: calibration of the mass-richness relation
Grantee:Vinicius Consolini Busti
Support type: Scholarships abroad - Research Internship - Post-doctor