Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

A bstract The R 2 inflation which is an extension of general relativity (GR) by quadratic scalar
curvature introduces a quasi-de Sitter expansion of the early Universe governed by Ricci …

We investigate inflationary dynamics in the framework of the Einstein-Gauss-Bonnet gravity.
In the model under consideration, the inflaton field is nonminimally coupled to the Gauss …

In this chapter we review the recent developments of realizing $ R^ 2$-like inflation in the
framework of a most general UV nonlocal extension of Einstein's general theory of relativity …

In this work we explicitly show that the perturbative unitarity of analytic infinite derivative
scalar field theories can be achieved using a modified prescription for computing scattering …

A bstract We investigate the non-perturbative regimes in the class of non-Abelian theories
that have been proposed as an ultraviolet completion of 4-D Quantum Field Theory (QFT) …

This thesis is devoted to the systematic study of non-local theories that respect Lorentz
invariance and are devoid of new, unphysical degrees of freedom. Such theories are …

As an extension of weak perturbation theory obtained in a recent analysis of infinite-
derivative nonlocal non-Abelian gauge theories motivated from p-adic string field theory …

We study exact solutions of the infinite derivative gravity with null radiation which belong to
the class of almost universal Weyl type III/N Kundt spacetimes. This class is defined by the …

We revisit the problem of generality of Starobinsky and Higgs inflation. The known results
obtained in the Einstein frame are generalized for the case of an arbitrary initial energy of …