Phenomenology of dark energy and modified gravity with BINGO

• Grant number: 16/04797-9
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: July 01, 2016
• End date: June 30, 2017
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Elcio Abdalla
• Grantee: André Alencar da Costa
• Supervisor: Richard Antony Battye
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: University of Manchester, England
• Associated to the scholarship: 13/26496-2 - Testing models of interaction between dark energy and dark matter, BP.PD

Abstract

The cosmological observations indicate that the Universe is in an accelerated expansion phase. One possible simple explanation for that is a cosmological constant homogeneously and isotropically filling the entire space. However, this model suffers from serious theoretical problems and there is still room for other exotic explanations. The usual approach consists in writing down a Lagrangian with extra fields and specific interactions, hoping to constrain its parameters and free functions with the available data. On the other hand, the effective action approach, inspired in particle physics, is an attempt to build a general quadratic Lagrangian for perturbations based only on the knowledge of the field content of the dark sector, which is sufficient to generate equations of motion for linearized perturbations. Thus, the comparison with data allows us to constrain whole classes of theoretical models. We intend to follow this approach and use several cosmological data to determine the space of parameters allowed by them. In particular, the next generation of cosmological observations will make use of the 21cm HI emission line as a tracer of the matter content and BINGO is a pathfinder for them. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

OLIVARI, L. C.; DICKINSON, C.; BATTYE, R. A.; MA, Y. -Z.; COSTA, A. A.; REMAZEILLES, M.; HARPER, S.. Cosmological parameter forecasts for HI intensity mapping experiments using the angular power spectrum. Monthly Notices of the Royal Astronomical Society, v. 473, n. 3, p. 4242-4256, JAN 2018. (16/04797-9)