Search Publications
Neutrino and Positron Constraints on Spinning Primordial Black Hole Dark Matter
Ray, Anupam; Laha, Ranjan; Dasgupta, Basudeb
Primordial black holes can have substantial spin—a fundamental property that has a strong effect on its evaporation rate. We conduct a comprehensive study of the detectability of primordial black holes with non-negligible spin, via the searches for the neutrinos and positrons in the MeV energy range. Diffuse supernova neutrino background searches …
Sign of Hard-X-Ray Pulsation from the γ -Ray Binary System LS 5039
Takahashi, T.; Enoto, T.; Makishima, K. +3 more
To understand the nature of the brightest γ -ray binary system LS 5039, hard x-ray data of the object, taken with the Suzaku and NuSTAR observatories in 2007 and 2016, respectively, were analyzed. The two data sets jointly gave tentative evidence for a hard x-ray periodicity, with a period of ∼9 s and a period increase rate by ∼3 ×10-10…
First Results on Dark Matter Substructure from Astrometric Weak Lensing
Van Tilburg, Ken; Weiner, Neal; Taki, Anna-Maria +1 more
Low-mass structures of dark matter (DM) are expected to be entirely devoid of light-emitting regions and baryons. Precisely because of this lack of baryonic feedback, small-scale substructures of the Milky Way are a relatively pristine testing ground for discovering aspects of DM microphysics and primordial fluctuations on subgalactic scales. In t…
Joining Bits and Pieces of Reionization History
Finelli, Fabio; Paoletti, Daniela; Hazra, Dhiraj Kumar +1 more
Cosmic microwave background (CMB) temperature and polarization anisotropies from Planck have estimated a lower value of the optical depth to reionization (τ ) compared to WMAP. A significant period in the reionization history would then fall within 6 <redshift(z )<10 , where detection of galaxies with Hubble frontier fields program and indep…