SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 89: DM, Neutrino Theory
T 89.4: Vortrag
Mittwoch, 22. März 2023, 18:15–18:30, POT/0251
Some Cosmological Constraints on Many Species Theories — •Alan Zander1, Philipp Eller1, and Manuel Ettengruber2 — 1TUM, Garching, Deutschland — 2Max-Planck-Institut für Physik, München, Deutschland
We consider the so-called Many Species Model introduced by Dvali and Redi, which postulates the existence of N ∼ 1032 particle species yielding a new mechanism to solve the well-known hierarchy problem. We study some possible extensions of the model allowing the electroweak vacuum expectation values of the Higgs bosons of the different Standard Model (SM) copies to break the permutation symmetry in the species space and we show how this renders the theory testable in the context of neutrino physics. These scenarios make also possible to address some of the other biggest questions in modern physics that remain open like the smallness of the active neutrino masses and the nature of dark matter, yielding a viable explanation for these two mysteries. That being said, we also analyze some of the cosmological implications of these extensions, obtaining the first constraints available in the literature for this sort of theories on the number of species that interact to some extent with the SM.