Could the cosmic acceleration be transient? A cosmographic evaluation

Author(s)

Guimaraes, A. C. C. ^[1] ; Lima, J. A. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Astron, BR-05508090 Sao Paulo - Brazil

• Document type: Journal article
• Source: Classical and Quantum Gravity; v. 28, n. 12 JUN 21 2011.
• Web of Science Citations: 39

Abstract

A possible slowing down of the cosmic expansion is investigated through a cosmographic approach. By expanding the luminosity distance to fourth order and fitting the SN Ia data from the most recent compilations (Union, Constitution and Union 2), the marginal likelihood distributions for the deceleration parameter today suggest a recent reduction of the cosmic acceleration and indicate that there is a considerable probability for q(0) > 0. Also in contrast to the prediction of the Lambda CDM model, the cosmographic q(z) reconstruction permits a cosmic expansion history where the cosmic acceleration could already have peaked and be presently slowing down, which would imply that the recent accelerated expansion of the universe is a transient phenomenon. It is also shown that to describe a transient acceleration the luminosity distance needs to be expanded at least to fourth order. The present cosmographic results depend neither on the validity of general relativity nor on the matter-energy contents of the universe. (AU)

• FAPESP's process: 07/54915-9 - Investigating the distribution of dark matter through its effects as gravitational lensing
• Grantee: Antonio Candido de Camargo Guimarães Junior
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 04/13668-0 - Cosmology in the era of precision: dark energy, dark matter and background cosmic radiation
• Grantee: Jose Ademir Sales de Lima
• Support Opportunities: Research Projects - Thematic Grants