Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-48325
Jetzer, P; Puy, D; Signore, M; Tortora, C (2011). Limits on decaying dark energy density models from the CMB temperature-redshift relation. General Relativity and Gravitation, 43(4):1083-1093.
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The nature of the dark energy is still a mystery and several models have been proposed to explain it. Here we consider a phenomenological model for dark energy decay into photons and particles as proposed by Lima (Phys Rev D 54:2571, 1996). He studied the thermodynamic aspects of decaying dark energy models in particular in the case of a continuous photon creation and/or disruption. Following his approach, we derive a temperature redshift relation for the cosmic microwave background (CMB) which depends on the effective equation of state w eff and on the "adiabatic index" γ. Comparing our relation with the data on the CMB temperature as a function of the redshift obtained from Sunyaev-Zel'dovich observations and at higher redshift from quasar absorption line spectra, we find w eff = -0.97 ± 0.03, adopting for the adiabatic index γ = 4/3, in good agreement with current estimates and still compatible with w eff = -1, implying that the dark energy content being constant in time.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Deposited On:||19 Feb 2012 19:01|
|Last Modified:||14 Feb 2014 15:51|
|ISSN:||0001-7701 (P) 1572-9532 (E)|
|Additional Information:||The original publication is available at www.springerlink.com|
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