A bstract The string theory swampland proposes that there is no UV-completion for an
effective field theory with an exact (metastable) de Sitter vacua, thereby ruling out standard …

We study detectability of the deviation in interacting and non-interacting cubic Galileon
models from the Λ CDM model through the 21-cm power spectrum. We show that the …

We use N-body simulation to study the structure formation in the cubic Galileon gravity
model where along with the usual kinetic and potential term we also have a higher …

The cubic Galileon model containing the lowest non-trivial order action of the full Galileon
action can produce the stable late-time cosmic acceleration. This model can have a …

In this paper, we study the effects of general relativistic corrections on the observed galaxy
power spectrum in thawing class of cubic Galileon model with linear potential that preserves …

Within the framework of modified gravity model namely Slotheon model, inspired by the
theory of extra dimensions, we explore the behaviour of Dark Energy and the perturbations …

We revisit the cosmological dynamics of the cubic Galileon model in light of the recently
proposed model-independent analyses of the Pantheon supernova data. At the background …

The objective of this Thesis is to explore several related questions with regards to criteria for
viability in scalar field theories. Roughly the first half is devoted to theoretical criteria, while …