RESEARCH
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Light mass Galileon models: Cosmological dynamics and perturbations

Md. Wali Hossain
Asia Pacific Center for Theoretical Physics, Pohang, South Korea

Abstract
Light mass Galileon scenario has cubic Galileon term along with the standard kinetic term and a potential. Potential is added phenomenologically to achieve late time acceler- ation. There is a nonminimal coupling between matter and the scalar field in the Einstein frame. In this talk, I shall discuss the background cosmology and first and second order cosmological perturbations in this scenario. The effect of the conformal coupling constant on the power spectrum and reduced bispectrum would be discussed. I shall also show the evolution of f σ 8 for different conformal coupling constant and its comparison with the redshift-space distortions data.

2018 July 19, 15:00

IA/U.Lisboa
Faculdade de CiÍncias da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia