Speaker
Description
We are currently witnessing a remarkable era in the fields
of cosmology and gravitation, as an ever-increasing amount of
observational data continues to be collected. One of the most
perplexing questions confronting cosmologists today concerns the
mysterious source responsible for the Universe’s recent accelerated
expansion. The most widely accepted explanations for this phenomenon
involve either a dark energy component or a modified theory of
gravity. In this talk, we present, on the one hand, several dark
energy models, ranging from axion-like scalar fields and kinetic
gravity braiding models to 3-form fields. On the other hand, we
explore modified theories of gravity, in particular those based on
f(Q) gravity, as alternative explanations for the Universe’s current
accelerated expansion.We also discuss the observational constraints on
these models. Furthermore, we examine how they may contribute to a
potential resolution of the ongoing H_0 and S_8 tensions.
