Volume 537, January 2012
|Number of page(s)||4|
|Section||Cosmology (including clusters of galaxies)|
|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: firstname.lastname@example.org; email@example.com;
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: firstname.lastname@example.org; email@example.com
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
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