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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…
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…
Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
The Pierre Auger Collaboration
Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the…
Dark matter's X-files
Alexander Kusenko
Sterile neutrinos with keV masses can constitute all or part of the cosmological dark matter. The electroweak-singlet fermions, which are usually introduced to explain the masses o…
Sterile neutrinos and structure formation
Jaroslaw Stasielak, Peter L. Biermann, Alexander Kusenko
Warm dark matter is consistent with the observations of the large-scale structure, and it can also explain the cored density profiles on smaller scales. However, it has been argued…
Thermal and chemical evolution of the primordial clouds in warm dark matter models with keV sterile neutrinos in one-zone approximation
Jaroslaw Stasielak, Peter L. Biermann, Alexander Kusenko
We follow the evolution of the baryonic top-hat overdensity in a single-zone approximation. Our goal is to juxtapose the evolution of the gas temperature in the primordial clouds i…
Sterile dark matter and reionization
Alexander Kusenko
Sterile neutrinos with masses in the keV range can be the dark matter, and their emission from a supernova can explain the observed velocities of pulsars. The sterile neutrino deca…
Detecting sterile dark matter in space
Alexander Kusenko
Space-based instruments provide new and, in some cases, unique opportunities to search for dark matter. In particular, if dark matter comprises sterile neutrinos, the x ray detecti…
Thermal evolution of the primordial clouds in warm dark matter models with keV sterile neutrinos
Jaroslaw Stasielak, Peter L. Biermann, Alexander Kusenko
We analyze the processes relevant for star formation in a model with dark matter in the form of sterile neutrinos. Sterile neutrino decays produce an X-ray background radiation tha…
Relic keV sterile neutrinos and reionization
Peter L. Biermann, Alexander Kusenko
A sterile neutrino with mass of several keV can account for cosmological dark matter, as well as explain the observed velocities of pulsars. We show that X-rays produced by the dec…
Effects of neutrino-driven kicks on the supernova explosion mechanism
Chris L. Fryer, Alexander Kusenko
We show that neutrino-driven pulsar kicks can increase the energy of the supernova shock. The observed large velocities of pulsars are believed to originate in the supernova explos…
Interactions of ultrahigh-energy cosmic rays with photons in the galactic center
Alexander Kusenko, Jason Schissel, Floyd W. Stecker
Ultrahigh-energy cosmic rays passing through the central region of the Galaxy interact with starlight and the infrared photons. Both nuclei and protons generate secondary fluxes of…
Astrophysical bounds on supersymmetric dark-matter Q-balls
Alexander Kusenko, Lee C. Loveridge, Mikhail Shaposhnikov
Stable baryonic Q-balls, which appear in supersymmetric extensions of the Standard Model, could form at the end of cosmological inflation from fragmentation of the Affleck -- Dine…
Pulsar kicks from neutrino oscillations
Alexander Kusenko
Neutrino oscillations in a core-collapse supernova may be responsible for the observed rapid motions of pulsars. Given the present bounds on the neutrino masses, the pulsar kicks r…
Neutrino oscillations, and the origin of pulsar velocities and dark matter
Alexander Kusenko
Neutrino oscillations in a core-collapse supernova may be responsible for the observed rapid motions of pulsars. Three-dimensional numerical calculations show that, in the absence…
Gamma ray bursts and the origin of galactic positrons
Gianfranco Bertone, Alexander Kusenko, Sergio Palomares-Ruiz +2
A recent observation of the 511 keV electron-positron annihilation line from the Galactic bulge has prompted a debate on the origin of the galactic positrons responsible for this e…
Possible astrophysical clues of dark matter
Alexander Kusenko
The physics of the supernova may provide a clue of the cosmological dark matter. In the absence of new physics, the supernova calculations do not explain the observed velocities of…
Pulsar kicks and dark matter from a sterile neutrino
Alexander Kusenko
The observed velocities of radio pulsars, which range in the hundreds kilometers per second, and many of which exceed 1000 km/s, are not explained by the standard physics of the su…
Long and short gamma-ray bursts, and the pulsar kicks
Alexander Kusenko, Dmitry V. Semikoz
One of the mysteries that surround gamma-ray bursts (GRB) is the origin of two classes of events: long and short GRB. The short GRB are similar to the first second of a long GRB. W…
Pulsar velocities and dark matter hint at a singlet neutrino
Alexander Kusenko
Two astrophysical puzzles, the origin of pulsar velocities and that of dark matter, may have a simultaneous explanation if there exists a sterile neutrino with a mass in the 1-20 k…
Pulsar kicks from a dark-matter sterile neutrino
George M. Fuller, Alexander Kusenko, Irina Mocioiu +1
We show that a sterile neutrino with mass in the 1-20 keV range and a small mixing with the electron neutrino can simultaneously explain the origin of the pulsar motions and the da…
Q-ball candidates for self-interacting dark matter
Alexander Kusenko, Paul J. Steinhardt
We show that non-topological solitons, known as Q-balls, are promising candidates for self-interacting dark matter. They can satisfy the cross-section requirements for a broad rang…