[HTML][HTML] Inflationary interpretation of the stochastic gravitational wave background signal detected by pulsar timing array experiments

S Vagnozzi - Journal of High Energy Astrophysics, 2023 - Elsevier
Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

Frame-dependence of higher-order inflationary observables in scalar-tensor theories

A Karam, T Pappas, K Tamvakis - Physical Review D, 2017 - APS
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 …

Coleman-Weinberg linear inflation: metric vs. Palatini formulation

A Racioppi - Journal of Cosmology and Astroparticle Physics, 2017 - iopscience.iop.org
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 …

Inflation with a quartic potential in the framework of Einstein-Gauss-Bonnet gravity

EO Pozdeeva, MR Gangopadhyay, M Sami… - Physical Review D, 2020 - APS
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 …

Inflation and reheating in theories with spontaneous scale invariance symmetry breaking

M Rinaldi, L Vanzo - Physical Review D, 2016 - APS
We study a scale-invariant model of quadratic gravity with a nonminimally coupled scalar
field. We focus on cosmological solutions and find that scale invariance is spontaneously …

Constant-roll (quasi-) linear inflation

A Karam, L Marzola, T Pappas… - … of Cosmology and …, 2018 - iopscience.iop.org
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 …

New universal attractor in nonminimally coupled gravity: Linear inflation

A Racioppi - Physical Review D, 2018 - APS
Once quantum corrections are taken into account, the strong coupling limit of the ξ-attractor
models (in metric gravity) might depart from the usual Starobinsky solution and move into …

Linear inflation from quartic potential

K Kannike, A Racioppi, M Raidal - Journal of High Energy Physics, 2016 - Springer
A bstract We show that if the inflaton has a non-minimal coupling to gravity and the Planck
scale is dynamically generated, the results of Coleman-Weinberg inflation are confined in …

Construction of inflationary scenarios with the Gauss–Bonnet term and nonminimal coupling

EO Pozdeeva, SY Vernov - The European Physical Journal C, 2021 - Springer
Inflationary models with a scalar field nonminimally coupled both with the Ricci scalar and
with the Gauss–Bonnet term are studied. We propose the way of generalization of …

Traversing a kinetic pole during inflation: primordial black holes and gravitational waves

A Ghoshal, A Strumia - Journal of Cosmology and Astroparticle …, 2024 - iopscience.iop.org
We consider an inflationary kinetic function with an integrable pole that is traversed during
inflation. This scenario leads to enhanced spectra of primordial scalar inhomogeneities with …