Dark interactions and cosmological fine-tuning

Cosmological models involving an interaction between dark matter and dark energy have been proposed in order to solve the so-called coincidence problem. Different forms of coupling have been studied, but there have been claims that observational data seem to narrow (some of) them down to something a...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2008-05, Vol.2008 (5), p.007
Main Authors: Quartin, Miguel, Calvão, Maurício O, Jorás, Sergio E, Reis, Ribamar R R, Waga, Ioav
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGICAL MODELS
ENERGY DENSITY
INTERACTIONS
NONLUMINOUS MATTER
TUNING
UNIVERSE
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Summary:Cosmological models involving an interaction between dark matter and dark energy have been proposed in order to solve the so-called coincidence problem. Different forms of coupling have been studied, but there have been claims that observational data seem to narrow (some of) them down to something annoyingly close to the {Lambda}CDM (CDM: cold dark matter) model, thus greatly reducing their ability to deal with the problem in the first place. The smallness problem of the initial energy density of dark energy has also been a target of cosmological models in recent years. Making use of a moderately general coupling scheme, this paper aims to unite these different approaches and shed some light on whether this class of models has any true perspective in suppressing the aforementioned issues that plague our current understanding of the universe, in a quantitative and unambiguous way.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2008/05/007