Scalar fields have played an important role in the development of the fundamental theories
of physics as well as in other branches of physics such as gravitation and cosmology. For a …

The Starobinsky model, considered in the framework of the Palatini formalism, in contrast to
the metric formulation, does not provide us with a model for inflation, due to the absence of a …

We discuss the inflationary dynamics of a system with a non-minimal coupling between the
Higgs and the Ricci scalar as well as a Ricci scalar squared term. There are two scalar …

In the framework of classical scale invariance, we consider quadratic gravity in the Palatini
formalism and investigate the inflationary predictions of the theory. Our model corresponds …

In the context of scalar-tensor theories of gravity we compute the third-order corrected
spectral indices in the slow-roll approximation. The calculation is carried out by employing …

We study non-minimal Coleman-Weinberg inflation in the Palatini formulation of gravity in
the presence of an R 2 term. The Planck scale is dynamically generated by the vacuum …

It has been previously shown that the linear inflation appears naturally as a solution of
Coleman-Weinberg inflation, provided that the inflaton has a non-minimal coupling to gravity …

Abstract We extend the Coleman-Weinberg inflationary model where a scalar field ϕ is non-
minimally coupled to gravity with the addition of the R 2 term. We express the theory in terms …

Weyl conformal geometry may play a role in early cosmology where effective theory at short
distances becomes conformal. Weyl conformal geometry also has a built-in geometric …

In constant-roll inflation, the scalar field that drives the accelerated expansion of the
Universe is rolling down its potential at a constant rate. Within this framework, we highlight …