Journal Article

Adiabatic initial conditions for perturbations in interacting dark energy models

Elisabetta Majerotto, Jussi Väliviita and Roy Maartens

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 4, pages 2344-2354
Published in print March 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16140.x
Adiabatic initial conditions for perturbations in interacting dark energy models

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We present a new systematic analysis of the early radiation era solution in an interacting dark energy model to find the adiabatic initial conditions for the Boltzmann integration. In a model where the interaction is proportional to the dark matter density, adiabatic initial conditions and viable cosmologies are possible if the early-time dark energy equation of state parameter is we > −4/5. We find that when adiabaticity between cold dark matter, baryons, neutrinos and photons is demanded, the dark energy component satisfies automatically the adiabaticity condition. As Type Ia supernovae or baryon acoustic oscillation data require the recent-time equation of state parameter to be more negative, we consider a time-varying equation of state in our model. In a companion paper, we apply the initial conditions derived here and perform a full Monte Carlo Markov Chain likelihood analysis of this model.

Keywords: cosmic microwave background; cosmological parameters; cosmology: theory; dark matter

Journal Article.  5567 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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