Issue |
A&A
Volume 537, January 2012
|
|
---|---|---|
Article Number | A11 | |
Number of page(s) | 4 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/201117707 | |
Published online | 20 December 2011 |
Thermodynamics and dark energy
1 Universidade Federal do Rio Grande do Norte, Departamento de Física, Natal – RN, 59072-970, Brasil
e-mail: raimundosilva@dfte.ufrn.br; heydson@dfte.ufrn.br;
2 Universidade do Estado do Rio Grande do Norte, Departamento de Física, Mossoró – RN, 59610-210, Brasil
3 Observatório Nacional, Rua General José Cristino 77, 20921-400 Rio de Janeiro – RJ, Brasil
e-mail: rsousa@on.br; alcaniz@on.br
Received: 14 July 2011
Accepted: 15 September 2011
Significant observational effort has been directed to unveiling the nature of the so-called dark energy. However, given the large number of theoretical possibilities, it is possible that this a task cannot be based only on observational data. We discuss some thermodynamic properties of this energy component assuming a general time-dependent equation-of-state parameter w(z) = w0 + waf(z), where w0 and wa are constants and f(z) may assume different forms. We show that very restrictive bounds can be placed on the w0 – wa space when current observational data are combined with the thermodynamic constraints derived.
Key words: cosmological parameters / dark energy / cosmology: observations / cosmology: theory
© ESO, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.