GeomGravX: 10 Years of Geometric Foundations of Gravity and eXtensions (in Tartu)

A simple example of “non-minimal” Pre-Big Bang scenario

Not scheduled

20m

A106 (Physicum, University of Tartu)

Oral or Poster

Speaker

Pietro Conzinu (Scuola Superiore Meridionale)

Description

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-dynamic model of sources and show that their effective viscosity
breaks the S-duality symmetry of the tensor-axion perturbation spectra, as in general expected for
the non-minimal scenario