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Contribution of Secondary Neutrinos from Line-of-sight Cosmic Ray Interactions to the IceCube Diffuse Astrophysical Flux
Alina Kochocki, Volodymyr Takhistov, Alexander Kusenko +1
In ten years of observations, the IceCube neutrino observatory has revealed a neutrino sky in tension with previous expectations for neutrino point source emissions. Astrophysical…
Testing Stochastic Gravitational Wave Signals from Primordial Black Holes with Optical Telescopes
Sunao Sugiyama, Volodymyr Takhistov, Edoardo Vitagliano +3
Primordial black holes (PBHs) can constitute the predominant fraction of dark matter (DM) if PBHs reside in the currently unconstrained "sublunar" mass range. PBHs originating from…
Primordial black holes from long-range scalar forces and scalar radiative cooling
Marcos M. Flores, Alexander Kusenko
We describe a new scenario for the formation of primordial black holes (PBHs). In the early Universe, the long-range forces mediated by the scalar fields can lead to formation of h…
Constraining Primordial Black Holes with Dwarf Galaxy Heating
Philip Lu, Volodymyr Takhistov, Graciela B. Gelmini +3
Black holes formed in the early universe, prior to the formation of stars, can exist as dark matter and also contribute to the black hole merger events observed in gravitational wa…
Big Bang Nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe
Graciela B. Gelmini, Masahiro Kawasaki, Alexander Kusenko +2
We consider the cosmological effects of sterile neutrinos with the masses of MeV. The decay of sterile neutrinos changes the thermal history of the Universe and affects…
Exploring Primordial Black Holes from the Multiverse with Optical Telescopes
Alexander Kusenko, Misao Sasaki, Sunao Sugiyama +3
Primordial black holes (PBHs) are a viable candidate for dark matter if the PBH masses are in the currently unconstrained "sublunar" mass range. We revisit the possibility that PBH…