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Centro de Astrofísica da Universidade do Porto

Generalized dark energy interactions with multiple fluids

C. van de Bruck, J. Mifsud, J. P. Mimoso, N. J. Nunes

In the search for an explanation for the current acceleration of the Universe,
scalar fields are the most simple and useful tools to build models of dark energy. This field,
however, must in principle couple with the rest of the world and not necessarily in the same
way to different particles or fluids. We provide the most complete dynamical system analysis
to date, consisting of a canonical scalar field conformally and disformally coupled to both
dust and radiation. We perform a detailed study of the existence and stability conditions of
the systems and comment on constraints imposed on the disformal coupling from Big-Bang
Nucleosynthesis and given current limits on the variation of the fine–structure constant.

Journal of Cosmology and Astroparticle Physics
Volume 11
November 2016

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Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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