684 citations · 13.5k across the 217 of their papers we have counts for
103 papers · 1 filter
Indirect Detection of Dark Matter Around a Supermassive Black Hole with High Energy-Resolution Gamma-Ray Telescopes
Yu Watanabe, Alexander Kusenko, Shigeki Matsumoto
We explore whether the unprecedented energy resolution of upcoming gamma-ray telescopes can uncover relativistic effects in photon spectra resulting from dark matter (DM) annihilat…
Testing high scale supersymmetry via second order gravitational waves
Marcos M. Flores, Alexander Kusenko, Lauren Pearce +2
Supersymmetry predicts multiple flat directions, some of which carry a net baryon or lepton number. Condensates in such directions form during inflation and later fragment into Q-b…
Defrosting and Blast Freezing Dark Matter
Marcos M. Flores, Chris Kouvaris, Alexander Kusenko
We show that the present-day dark matter abundance can be produced through a novel mechanism that involves a very rapid thermal freeze-out caused by inhomogeneous heating and succe…
Strong Lensing of High-Energy Neutrinos
Yoon Chan Taak, Tommaso Treu, Yoshiyuki Inoue +1
We consider the effects of strong gravitational lensing by galaxy-scale deflectors on the observations of high-energy (EGeV) neutrinos (HEN). For HEN at cosmological distances…
Fireball baryogenesis from early structure formation due to Yukawa forces
Marcos M. Flores, Alexander Kusenko, Lauren Pearce +1
We show that viable electroweak baryogenesis can be realized without a first-order phase transition if plasma is heated inhomogeneously by nongravitational structure formation in s…
Generating Non-topological Solitons Via Thermal Corrections: Higgs Balls
Lauren Pearce, Graham White, Alexander Kusenko
Scalar fields which carry charge can generally form non-topoligical solitons (Q-balls), if the energy in the extended configuration is less than the energy of an equivalent number…
Constraints on sterile neutrino models from strong gravitational lensing, Milky Way satellites, and Lyman- forest
Ioana A. Zelko, Tommaso Treu, Kevork N. Abazajian +5
The nature of dark matter is one of the most important unsolved questions in science. Some dark matter candidates do not have sufficient nongravitational interactions to be probed…
Snowmass2021 Cosmic Frontier White Paper:Primordial Black Hole Dark Matter
Simeon Bird, Andrea Albert, Will Dawson +13
Primordial Black Holes (PBHs) are a viable candidate to comprise some or all of the dark matter and provide a unique window into the high-energy physics of the early universe. This…
Primordial black holes as a dark matter candidate in theories with supersymmetry and inflation
Marcos M. Flores, Alexander Kusenko
We show that supersymmetry and inflation, in a broad class of models, generically lead to formation of primordial black holes (PBHs) that can account for dark matter. Supersymmetry…
Possible evidence of QCD axion stars in HSC and OGLE microlensing events
Sunao Sugiyama, Masahiro Takada, Alexander Kusenko
Dark matter in the form of axions is expected to form miniclusters, and their dense regions can harbor compact axion stars. Such axion stars could be discovered by microlensing eve…
Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis
Graham White, Lauren Pearce, Daniel Vagie +1
In Affleck-Dine baryogenesis, the observed baryon asymmetry of the Universe is generated through the evolution of the vacuum expectation value (VEV) of a scalar condensate. This sc…
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…
Solitosynthesis and Gravitational Waves
Djuna Croon, Alexander Kusenko, Anupam Mazumdar +1
We study the gravitational wave phenomenology in models of solitosynthesis. In such models, a first order phase transition is precipitated by a period in which non-topological soli…
Hidden Treasures: sterile neutrinos as dark matter with miraculous abundance, structure formation for different production mechanisms, and a solution to the sigma-8 problem
Kevork N. Abazajian, Alexander Kusenko
We discuss numerous mechanisms for production of sterile neutrinos, which can account for all or a fraction of dark matter, and which can range from warm to effectively cold dark m…
Leptogenesis from spontaneous symmetry breaking during inflation
Yi-Peng Wu, Louis Yang, Alexander Kusenko
Symmetry breaking in the Higgs field via a non-minimal coupling to gravity or higher-dimensional interactions with the inflaton can lead to condensation at a large vacuum expectati…
Cosmic infrared background excess from axion-like particles and implications for multi-messenger observations of blazars
Oleg E. Kalashev, Alexander Kusenko, Edoardo Vitagliano
The first measurement of the diffuse background spectrum at 0.8-1.7 from the CIBER experiment has revealed a significant excess of the cosmic infrared background (CIB) ra…
Large Leptonic Dirac CP Phase from Broken Democracy with Random Perturbations
Shao-Feng Ge, Alexander Kusenko, Tsutomu T. Yanagida
A large value of the leptonic Dirac CP phase can arise from broken democracy, where the mass matrices are democratic up to small random perturbations. Such perturbations are a natu…
US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report
Marco Battaglieri, Alberto Belloni, Aaron Chou +248
This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in Dark Matter" held at University of Maryland on March 23-25, 2017.
Relaxation leptogenesis, isocurvature perturbations, and the cosmic infrared background
Masahiro Kawasaki, Alexander Kusenko, Lauren Pearce +1
Observations of cosmic infrared background (CIB) radiation exhibit significant fluctuations on small angular scales. A number of explanations have been put forth, but there is curr…
SU(5) Unification with TeV-scale Leptoquarks
Peter Cox, Alexander Kusenko, Olcyr Sumensari +1
It was previously noted that SU(5) unification can be achieved via the simple addition of light scalar leptoquarks from two split multiplets. We explore the parameter space…
Dark Cosmic Rays
Ping-Kai Hu, Alexander Kusenko, Volodymyr Takhistov
If dark matter particles have an electric charge, as in models of millicharged dark matter, such particles should be accelerated in the same astrophysical accelerators that produce…
Astrophysical constraints on dark-matter -balls in the presence of baryon-violating operators
Eric Cotner, Alexander Kusenko
Supersymmetric extensions of the standard model predict the existence of non-topological solitons, -balls. Assuming the standard cosmological history preceded by inflation, -…
Leptogenesis via the 750 GeV pseudoscalar
Alexander Kusenko, Lauren Pearce, Louis Yang
Recently the ATLAS and CMS collaborations have reported evidence of a diphoton excess which may be interpreted as a pseudoscalar boson S with a mass around 750 GeV. To explain the…
Why three generations?
Masahiro Ibe, Alexander Kusenko, Tsutomu T. Yanagida
We discuss an anthropic explanation of why there exist three generations of fermions. If one assumes that the right-handed neutrino sector is responsible for both the matter-antima…