3 papers
hep-th2026
Scalar Hair at the String-Black-Hole Correspondence
Eliseo Pavone
We study static, spherically symmetric axion--dilaton solutions of the tree-level four-dimensional string effective action. Using the sigma-model structure of the scalar sector, we…
gr-qc2025
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…
gr-qc2024
Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
Ido Ben-Dayan, Gianluca Calcagni, Maurizio Gasperini +4
We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce…