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Constraints on small-scale primordial power by annihilation signals from extragalactic dark matter minihalos
Tomohiro Nakama, Teruaki Suyama, Kazunori Kohri +1
We revisit constraints on small-scale primordial power from annihilation signals from dark matter minihalos. Using gamma rays and neutrinos from extragalactic minihalos and assumin…
Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles
Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi +1
We study effects of long-lived massive particles, which decay during the big-bang nucleosynthesis (BBN) epoch, on the primordial abundances of light elements. Compared to the previ…
Electroweak Vacuum Collapse induced by Vacuum Fluctuations of the Higgs Field around Evaporating Black Holes
Kazunori Kohri, Hiroki Matsui
In this paper, we discuss the Higgs vacuum stability around evaporating black holes. We provide a new approach to investigate the false vacuum decay around the black hole and clear…
CMB bounds on disk-accreting massive Primordial Black Holes
Vivian Poulin, Pasquale D. Serpico, Francesca Calore +2
Stellar-mass Primordial Black Holes (PBH) have been recently reconsidered as a Dark Matter (DM) candidate, after the aLIGO discovery of several binary BH mergers with masses of ten…
Spins of primordial black holes formed in the matter-dominated phase of the Universe
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri +1
Angular momentum plays very important roles in the formation of PBHs in the matter-dominated phase if it lasts sufficiently long. In fact, most collapsing masses are bounced back d…
Can decaying particle explain cosmic infrared background excess?
Kazunori Kohri, Takeo Moroi, Kazunori Nakayama
Recently the CIBER experiment measured the diffuse cosmic infrared background (CIB) flux and claimed an excess compared with integrated emission from galaxies. We show that the CIB…