6 papers
Bounds on nonlinear electrodynamics via resummed relative entropy
Pietro Conzinu, Daiki Ueda
We investigate nonlinear electrodynamic effective field theories (EFTs) through the relative entropy evaluated in suitable background electromagnetic fields. In this setup, the rel…
Bounds on nonlinear effective field theories via resurgent relative entropy
Pietro Conzinu, Daiki Ueda
We study nonlinear effective field theories (EFTs) with factorially growing perturbative expansions, focusing on a class in which the relative entropy encodes an infinite tower of…
A simple example of "non-minimal" Pre-Big Bang scenario
PIetro Conzinu, Maurizio Gasperini, Eliseo Pavone
We give an example of non-minimal pre-big bang scenario able to produce the PTA signal considering a modified evolution of the high-curvature string phase, including the contributi…
From the string vacuum to FLRW or de Sitter via corrections
P. Conzinu, G. Fanizza, M. Gasperini +3
We first make more precise a recent "Hamiltonian" reformulation of the Hohm-Zwiebach approach to the tree-level, -invariant string cosmology equations at all orders in the…
Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data
P. Conzinu, G. Fanizza, M. Gasperini +3
We discuss a recently proposed fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in terms of a relic stochastic…
Gauge invariant quantum backreaction in U(1) axion inflation
Davide Campanella Galanti, Pietro Conzinu, Giovanni Marozzi +1
We evaluate the quantum backreaction due to a gauge field coupled to a pseudo-scalar field driving a slow-roll inflationary stage, the so-called axion inflation. The backreaction i…