Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/4610
Título: 3-Form Cosmology: Phantom Behaviour, Singularities and Interactions
Autor: Morais, João
Bouhmadi-López, Mariam
Marto, João Pedro de Jesus
Palavras-chave: Dark energy 3-forms
DM-DE interaction
Dark energy 3-forms
Future singularities
Cosmography
Statefinders approach
Growth rate
Dynamical systems
Data: 2017
Editora: MDPI
Resumo: The latest cosmological observations by the Planck collaboration (and combined with others) are compatible with a phantom-like behaviour (w < − 1) for the dark energy equation of state that drives the current acceleration of the Universe. With this mindset, we look into models where dark energy is described by a 3-form field minimally coupled to gravity. When compared to a scalar field, these models have the advantage of more naturally accommodating a cosmological-constant and phantom-like behaviours. We show how the latter happens for a fairly general class of positive-valued potentials, and through a dynamical system approach, we find that in such cases the 3-form field leads the Universe into a Little Sibling of the Big Rip singular event into the future. In this work, we explore the possibility of avoiding such singularity via an interaction in the dark sector between cold dark matter and the 3-form field. For the kind of interactions considered, we deduce a condition for replacing the LSBR by a late time de Sitter phase. For specific examples of interactions that meet this condition, we look for distinctive imprints in the statefinder hierarchy { S 3 ( 1 ) ; S 4 ( 1 ) } , { S 3 ( 1 ) ; S 5 ( 1 ) } , and in the growth rate of matter, e ( z ) , through the composite null diagnostic (CND).
Peer review: yes
URI: http://hdl.handle.net/10400.6/4610
DOI: 10.3390/universe3010021
Versão do Editor: http://www.mdpi.com/2218-1997/3/1/21
Aparece nas colecções:ICI - CMA | Documentos por Auto-Depósito
FC - DF | Documentos por Auto-Depósito

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