A simple example of "non-minimal" Pre-Big Bang scenario
General Relativity and Quantum Cosmology
2025-11-11 v2
Abstract
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 contribution of high-energy string sources. We use a fluid-dinamical model of sources and show that their effective viscosity breaks the -duality symmetry of the tensor-axion perturbation spectra, as in general expected for the non-minimal scenario.
Keywords
Cite
@article{arxiv.2506.00995,
title = {A simple example of "non-minimal" Pre-Big Bang scenario},
author = {PIetro Conzinu and Maurizio Gasperini and Eliseo Pavone},
journal= {arXiv preprint arXiv:2506.00995},
year = {2025}
}
Comments
23 pages, 2 figures, five references added. Final version, accepted for publication in JCAP