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Cosmology with large photometric and spectroscopic galaxy surveys

Grant number: 19/04881-8
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): June 01, 2019
Effective date (End): May 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
Principal Investigator:Rogério Rosenfeld
Grantee:Hugo Orlando Camacho Chavez
Home Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil
Associated research grant:16/01343-7 - ICTP South American Institute for Fundamental Research: a regional center for theoretical physics, AP.TEM

Abstract

The dynamics of the formation of the observed large-scale structures, along with dark matter, dark energy, the accelerated expansion of the universe and their inter-relations remain as some of the biggest puzzles of modern cosmology and have been extensively investigated over the last years. In particular, understanding the nature of cosmic acceleration foresees important implications for Cosmology, Gravitation and Particle Physics, among others. Modern wide-area galaxy surveys such as the DES, the eBOSS, and the LSST appear as a powerful approach to these problems via the self-consistent combination of complementary cosmological tests. However, they bring new practical and theoretical challenges for exploiting the information contained in the data. This project aims to use different photometric (DES, LSST) and spectroscopic (eBOSS) experiments to constrain cosmological models using the self-consistent combination of multiple techniques exploiting the information contained in the observed distribution of galaxies. We will lead the task force for the detection of baryon acoustic oscillations (BAO) on third-year data (Y3) of DES by analyzing the angular clustering of galaxies in harmonic space (power spectra), continuing our analysis of data from the first year (Y1) (Camacho et al. 2018). Also for DES, we will apply multiple tools developed by our research group over the last years to lead the study of the combination of measurements of galaxy clustering and weak gravitational lensing on harmonic space. For eBOSS, we will use the most precise spectroscopic data up to date to lead a study of detection of the BAO scale using the harmonic-space angular clustering of different tracers of the matter density field. Finally, these studies, which will be performed with already existent data from DES and eBOSS, will be applied for preliminary analysis of the upcoming LSST.