Search Publications
I N T E G R A L constraints on primordial black holes and particle dark matter
Slatyer, Tracy R.; Muñoz, Julian B.; Laha, Ranjan
The International Gamma-Ray Astrophysics Laboratory (I N T E G R A L ) satellite has yielded unprecedented measurements of the soft gamma-ray spectrum of our Galaxy. Here we use those measurements to set constraints on dark matter (DM) that decays or annihilates into photons with energies E ≈0.02 - 2 MeV . First, we revisit the constraints on part…
Primordial black holes and secondary gravitational waves from k and G inflation
Gao, Qing; Zhang, Chao; Gong, Yungui +3 more
The possibility that in the mass range around 10-12 M⊙ most of dark matter is constituted of primordial black holes (PBHs) is a very interesting topic. To produce PBHs with this mass, the primordial scalar power spectrum needs to be enhanced to the order of 0.01 at the scale k ∼1012 Mpc-1. The enhanced p…
NuSTAR tests of sterile-neutrino dark matter: New Galactic bulge observations and combined impact
Wik, Daniel R.; Krivonos, Roman; Beacom, John F. +4 more
We analyze two dedicated NuSTAR observations with exposure ∼190 ks located ∼1 0 ° from the Galactic plane, one above and the other below, to search for x-ray lines from the radiative decay of sterile-neutrino dark matter. These fields were chosen to minimize astrophysical x-ray backgrounds while remaining near the densest region of the dark matter…
Primordial black holes and oscillating gravitational waves in slow-roll and slow-climb inflation with an intermediate noninflationary phase
Wu, Puxun; Yu, Hongwei; Fu, Chengjie
We propose a new single field inflation model in which the usual slow-roll inflation is joined to a new period of slow-climb and slow-roll inflation through a short intermediate noninflationary phase. We then show that primordial curvature perturbations can be enhanced at small scales, a sizable amount of primordial black holes (PBHs) can be produ…
Primordial black holes and gravitational waves in nonstandard cosmologies
Mohanty, Subhendra; Parashari, Priyank; Bhattacharya, Sukannya
For primordial black holes (PBHs) to form a considerable fraction of cold dark matter, the required amplitude of primordial scalar perturbations is quite large (Pζ(k )∼10-2) if PBH is formed in radiation epoch. In alternate cosmological histories, where additional epoch of arbitrary equation of state precede radiation epoch, …