Poster

PUBDB-2024-07416

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png BBN photodisintegration limitsfrom neutrino injections

Bianco, S. (Corresponding author)DESY* ; Schmidt-Hoberg, K.DESY* ; Frerick, J.Extern*DESY* ; Hufnagel, M.DESY* ; Depta, P. F.DESY* ; Thomas, H.

2024

Abstract: Constraints on dark sector particles decaying into neutrinos typically focus on their impact on the effective number of relativistic species in the early Universe. However, for heavy relics with longer lifetimes, constraints mainly arise from the photo-disintegration of primordial abundances. The high-energy neutrinos injected by the decay can interact with both the thermal neutrinos and other high-energy neutrinos. Among these interactions, annihilations into electromagnetic particles will induce an electromagnetic cascade that affects the abundances of the already formed light elements via photo-disintegration. In this work, we present constraints on these dark sector particles. Specifically, we implement a Monte Carlo code to simulate the electromagnetic cascade, instead of solving the full set of Boltzmann equations. We find improved bounds on the particle's lifetime, abundance, and mass.

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. HIDDeN - Hunting Invisibles: Dark sectors, Dark matter and Neutrinos (860881) (860881)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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