ABSTRACT:
The era of precise observations in modern cosmology has led to a deeper understanding of the content and dynamics of the universe. However, current tensions in the determination of key cosmological parameters between late and early observations may indicate gaps in our understanding of Physics. In addition to the well-known tensions over the expansion rate and the rate of matter clustering, another tension is slowly building up between cosmology and local experiments over the neutrino mass constraints. Mass-varying neutrino models, in which neutrinos interact with dark energy, have the potential to relax this tension

ABSTRACT:

In this talk my purpose is to describe how excited vortices from non excited BPS in the Abelian Higgs
model scatter in a far more complex manner than in the geodesic approach over the BPS moduli space.
I will concentrate in the N=2 magnetic flux case where a fractal structure showing a different number
of vortices at different windows in the initial velocity arises. The conceptual framework where this chaotic
structure emerges is based on the collective coordinates effective dynamics. The outcome will be compared
with the results offered by the numerical analysis performed by Morgan Rees in the full AHM. Time permitting
I will sketch preliminary ideas about the existence of similar structures in the system of N=3 excited vortices.