Banca de DEFESA: LUAN ORION DE OLIVEIRA BARAUNA FERREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUAN ORION DE OLIVEIRA BARAUNA FERREIRA
DATA : 23/08/2019
HORA: 10:00
LOCAL: Instituto de Física da Universidade Federal da Bahia
TÍTULO:

Testing Cosmologies with Dark Sector Interaction Using Redshift Space Distortion Data

PALAVRAS-CHAVES:

Cosmology, Alternative Model, Dark Sector, Disturbance Theory, Growth Rate, Redshift Space Distortion.

PÁGINAS: 101
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

Here we use the Chaplygin gas model decomposed in matter without pressure and vacuum energy to study the distortion in redshift space caused by the peculiar velocity of galaxies. Introducing baryonic matter into the equations that describe dynamics, we get the theoretical prediction of the fσ8 combination and show that its evolution depends on the vacuum energy density clustering model. Using the observational data for the redshift space distortion measurements fσ8, we performed a statistical test using the Monte Carlo Chain operating the Python MultiNest algorithm. Assuming that the vacuum density is homogeneous we find the best fit parameter set σ8(0) = 0.80 {+0.14 −0.11}, Ωm0 = {0.31+0.19 −0.17} and α = −0.05 {+0.64 −0.58}. By setting some values for the α parameter we find that such models are able to describe fσ8 data with the best fit Ωm0−σ8(0) growing to α < 0 and descending to α > 0.

MEMBROS DA BANCA:
Externo ao Programa - 3060535 - CARLOS ENRIQUE VALCARCEL FLORES
Externo à Instituição - FARINALDO DA SILVA QUEIROZ - UFRN
Interno - 2582868 - HUMBERTO DE ALMEIDA BORGES