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Invisible Higgs boson decay into massive neutrinos of fourth generation
Results from several recent experiments provide indirect evidences in the favor of existence of a 4th generation neutrino. Such a neutrino of mass m about 50 GeV is compatible with current physical
May heavy neutrinos solve underground and cosmic-ray puzzles?
Primordial heavy neutrinos of the fourth generation might explain different astrophysical puzzles. The simplest fourth-neutrino scenario is consistent with known fourth-neutrino physics, cosmic ray
On the classical description of the recombination of dark matter particles with a Coulomb-like interaction
Abstract Cold dark matter (DM) scenario may be cured of several problems by involving self-interaction of dark matter. Viability of the models of long-range interacting DM crucially depends on the
Clusters of Primordial Black Holes
The Primordial Black Holes (PBHs) are a well-established probe for new physics in the very early Universe. We discuss here the possibility of PBH agglomeration into clusters that may have several
Signatures of primordial black hole dark matter
The nonbaryonic dark matter of the Universe is assumed to consist of new stable forms of matter. Their stability reflects symmetry of micro world and mechanisms of its symmetry breaking. In the early
Primordial black holes with mass $10^{16}-10^{17}$ g and reionization of the Universe
Primordial black holes (PBHs) with mass $10^{16}-10^{17}$ g almost escape constraints from observations so could essentially contribute to dark matter density. Hawking evaporation of such PBHs
Anti-helium flux as a signature for antimatter globular clusters in our Galaxy
The Alpha Magnetic Spectrometer experiment is shown to be sensitive to test the hypothesis on the existence of antimatter globular cluster in our Galaxy. The hypothesis follows from the analysis of
Electromagnetic probes of primordial black holes as dark matter.
The LIGO discoveries have rekindled suggestions that primordial black holes (BHs) may constitute part to all of the dark matter (DM) in the Universe. Such suggestions came from 1) the observed merger
Decaying Dark Atom constituents and cosmic positron excess
We present a scenario where dark matter is in the form of dark atoms that can accomodate the experimentally observed excess of positrons in PAMELA and AMS-02 while being compatible with the
Gamma-ray evidence for dark matter clumps
We discuss the possibility of identification of point-like gamma-ray sources (PGS) with small-scale dark matter (DM) clumps in our Galaxy. Gamma rays are supposed to originate from annihilation of DM