Skewness as a Test of Dark-Matter/Dark-Energy Unification

Details Skewness as a Test of Dark-Matter/Dark-Energy Unification Skewness as a Test of Dark-Matter/Dark-Energy Unification

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..739..512r&link_type=abstract

IX HADRON PHYSICS AND VII RELATIVISTIC ASPECTS OF NUCLEAR PHYSICS: A Joint Meeting on QCD and QCP. AIP Conference Proceedings, V

Physics

Nuclear Physics

Dark Matter, Cosmology, Unified Field Theories And Models

Scientific paper

Quartessence is one of the alternatives to the ΛACDM cosmotogical model that has lately attracted considerable interest. According to this unifying dark matter/energy scenario, the Universe evolved from an early nonrelativistic matter-dominated phase to a more recent accelerated expansion phase, driven by a single fluid component. Recently, it has been shown that some problems of the quartessence model, such as the existence of instabilities and oscillations in the matter power spectrum, can be avoided if a specific type of intrinsic entropy perturbation is considered. In the present contribution we explore the role of the skewness of the density distribution on large scales in constraining this nonadiabatic scenario. We show that nonadiabatic quartessence and quintessence have different signatures for the skewness and suggest that this quantity might prove helpful to break possible degeneracies between them.

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