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Abstract
If existing, feebly interacting particles such as sterile neutrinos, axionlike particles, and others would have been abundantly produced in the core formed during the collapse of Sanduleak in 1987. The duration of the neutrino burst detected at Kamiokande II and at the Irvine–Michigan–Brookhaven (IMB) experiment depended on the cooling speed of the newly formed proto-neutron star at the center of SN 1987A, and hence is often used to constrain these particles. However, many particles arising from physics beyond the standard model can be produced inside the core and decay afterwards with large energies. In this talk I will show how, using both published and unpublished legacy data from Kamiokande II and IMB, one ca constrain as an example massive Majoron-like pseudoscalar bosons $\phi$ coupled to neutrinos. These constraints are more stringent than the bounds obtained from Big Bang Nucleosynthesis, and that the flux of $\phi$ needs to be 100 times smaller than the flux predicted by saturating the energy-loss criterion. Therefore, we can exclude that feebly interacting Majorons could have any relevant effect on a core-collapse supernova explosion.
Biography
Currently moving to The Hebrew University of Jerusalem (HUJI)
Undergraduate studies at Naples UniversityPhD at the Max-Planck-Institute for Physics and Ludwig Maximilian University of Munich (graduated in 2019)
Postdoc at University of California, Los Angeles for 3 years (2019-2022)
Extended visits (>1-2 month) at Kavli Institute for the Physics and Mathematics of the Universe (IPMU, Tokyo) (2017)
Leon Rosenfeld fellow at Niels Bohr Institute of Copenhagen (2022)
“Pio Picchi” prize from the Italian Physical Society (2022)