The dawn of the twenty-first century came with very positive prospects for gravity, cosmology,
and astrophysics. Technological progress made it possible for cosmology to enter to its …

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 …

A bstract In this paper we will study R 2-like inflation in a non-local modification of gravity
which contains quadratic in Ricci scalar and Weyl tensor terms with analytic infinite …

We show that Minkowskian non-local quantum field theories are not unitary. We consider a
simple one loop diagram for a scalar non-local field and show that the imaginary part of the …

In this paper, we present an iterative method to generate an infinite class of new nonlocal
field theories whose propagators are ghost-free. We first examine the scalar field case and …

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 …

A bstract We prove in two ways that, for a special class of nonlocal field theories consistent
with linear and non-linear stability at the classical level, and with unitarity and super …

The second set of The Encyclopedia of Cosmology, in three volumes, continues this major,
long-lasting, seminal reference at the graduate student level laid out by the most prominent …

A method for consistent quantization of conformal gravity treating conformal symmetry in a
very controllable way is presented. First, we discuss local conformal symmetry in the …

A bstract We provide an example of nonlocal scalar electrodynamics that allows the same
Higgs mechanism so successful in local field theory. The nonlocal action is structured in …