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Title: Some remarks on the attractor behaviour in ELKO cosmology

Recent results on the dynamical stability of a system involving the interaction of the ELKO spinor field with standard matter in the universe have been reanalysed, and the conclusion is that such system does not exhibit isolated stable points that could alleviate the cosmic coincidence problem. When a constant parameter δ related to the potential of the ELKO field is introduced in the system however, stable fixed points are found for some specific types of interaction between the ELKO field and matter. Although the parameter δ is related to an unknown potential, in order to satisfy the stability conditions and also that the fixed points are real, the range of the constant parameter δ can be constrained for the present time and the coincidence problem can be alleviated for some specific interactions. Such restriction on the ELKO potential opens possibility to apply the ELKO field as a candidate to dark energy in the universe, and so explain the present phase of acceleration of the universe through the decay of the ELKO field into matter.
Authors:
; ;  [1]
  1. Faculdade de Engenharia de Guaratinguetá, Departamento de Física e Química, UNESP — Universidade Estadual Paulista, Av. Dr. Ariberto Pereira da Cunha 333, Pedregulho, 12516-410 Guaratinguetá, SP (Brazil)
Publication Date:
OSTI Identifier:
22373409
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ATTRACTORS; COSMOLOGY; INTERACTIONS; NONLUMINOUS MATTER; POTENTIALS; SPINOR FIELDS; STABILITY; UNIVERSE