The Umami Chaplygin Model. (arXiv:1901.11006v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lazkoz_R/0/1/0/all/0/1">Ruth Lazkoz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ortiz_Banos_M/0/1/0/all/0/1">María Ortiz-Baños</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Salzano_V/0/1/0/all/0/1">Vincenzo Salzano</a>
In this work we study in detail a phenomenological generalization of the
Chaplygin cosmological model, which we call as textit{umami} Chaplygin model.
We consider three different cosmological background scenarios in which our
fluid can play three different roles: only as a dark energy component; as a
dark matter and dark energy component; and as a dark plus baryonic matter and
dark energy component. With such analysis we explore the possibility to unify
the dark fluids under one single component within the context of General
Relativity. We test this hypothesis against the main available data related to
the cosmological background, namely: Type Ia supernovae; Baryon Acoustic
Oscillations; Quasars; Gamma Ray Bursts; Hubble data from cosmic chronometers;
and Cosmic Microwave Background. We eventually compare the statistically
efficiency and reliability of our model to describe observational data with
respect to the standard $Lambda$CDM model by means of the Bayesian Evidence.
Final results point to a positive (albeit not strong) evidence in favor of a
possible unification of dark energy and dark matter with a the textit{umami}
fluid.
In this work we study in detail a phenomenological generalization of the
Chaplygin cosmological model, which we call as textit{umami} Chaplygin model.
We consider three different cosmological background scenarios in which our
fluid can play three different roles: only as a dark energy component; as a
dark matter and dark energy component; and as a dark plus baryonic matter and
dark energy component. With such analysis we explore the possibility to unify
the dark fluids under one single component within the context of General
Relativity. We test this hypothesis against the main available data related to
the cosmological background, namely: Type Ia supernovae; Baryon Acoustic
Oscillations; Quasars; Gamma Ray Bursts; Hubble data from cosmic chronometers;
and Cosmic Microwave Background. We eventually compare the statistically
efficiency and reliability of our model to describe observational data with
respect to the standard $Lambda$CDM model by means of the Bayesian Evidence.
Final results point to a positive (albeit not strong) evidence in favor of a
possible unification of dark energy and dark matter with a the textit{umami}
fluid.
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