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Centro de Astrofísica da Universidade do Porto

Three-form inflation in type II Randall-Sundrum

N. J. Nunes, B. J. Barros

Abstract
It has been shown in the last few years that three-form fields present viable cosmological solutions for inflation and dark energy with particular observable signatures distinct from those of canonical single scalar field inflation. The aim of this work is to explore the dynamics of a single three-form in a five-dimensional type II Randall-Sundrum braneworld scenario, in which a three-form is confined to the brane and only gravity propagates in the bulk. We compare the solutions with the standard four-dimensional case already studied in the literature. In particular, we evaluate how the spectral index and the ratio of tensor-to-scalar perturbations are influenced by the presence of the bulk and put constraints on the parameters of the models in light of the recent Planck 2015 data.

Physical Review D
Volume 93
February 2016

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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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