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New Limits on Sterile Neutrinos from Suzaku Observations of the Ursa Minor Dwarf Spheroidal Galaxy
Michael Loewenstein, Alexander Kusenko, Peter L. Biermann
We present results of our search for X-ray line emission associated with the radiative decay of the sterile neutrino, a well-motivated dark matter candidate, in Suzaku Observatory…
The ground states of baryoleptonic Q-balls in supersymmetric models
Ian M. Shoemaker, Alexander Kusenko
In supersymmetric generalizations of the Standard Model, all stable Q-balls are associated with some flat directions. We show that, if the flat direction has both the baryon number…
Gravitational waves from fragmentation of a primordial scalar condensate into Q-balls
Alexander Kusenko, Anupam Mazumdar
A generic consequence of supersymmetry is formation of a scalar condensate along the flat directions of the potential at the end of cosmological inflation. This condensate is usual…
Heavy sterile neutrinos and supernova explosions
George M. Fuller, Alexander Kusenko, Kalliopi Petraki
We consider sterile neutrinos with rest masses ~0.2 GeV. Such sterile neutrinos could augment core collapse supernova shock energies by enhancing energy transport from the core to…
Delayed pulsar kicks from the emission of sterile neutrinos
Alexander Kusenko, Bhabani Prasad Mandal, Alok Mukherjee
The observed velocities of pulsars suggest the possibility that sterile neutrinos with mass of several keV are emitted from a cooling neutron star. The same sterile neutrinos could…