823 citations · 14.7k across the 237 of their papers we have counts for
17 papers · 1 filter
High-scale SUSY from an R-invariant New Inflation in the Landscape
Masahiro Kawasaki, Masaki Yamada, Tsutomu T. Yanagida +1
We provide an anthropic reason that the supersymmetry breaking scale is much higher than the electroweak scale as indicated by the null result of collider experiments and observed…
CMB Constraint on Dark Matter Annihilation after Planck 2015
Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi
We update the constraint on the dark matter annihilation cross section by using the recent measurements of the CMB anisotropy by the Planck satellite. We fully calculate the cascad…
Can massive primordial black holes be produced in mild waterfall hybrid inflation?
Masahiro Kawasaki, Yuichiro Tada
We studied the possibility whether the massive primordial black holes (PBHs) surviving today can be produced in hybrid inflation. Though it is of great interest since such PBHs can…
Axino dark matter and baryon number asymmetry production by the Q-ball decay in gauge mediation
Shinta Kasuya, Etsuko Kawakami, Masahiro Kawasaki
We investigate the Q-ball decay into the axino dark matter in the gauge-mediated supersymmetry breaking. In our scenario, the Q ball decays mainly into nucleons and partially into…
Suppressing the QCD Axion Abundance by Hidden Monopoles
Masahiro Kawasaki, Fuminobu Takahashi, Masaki Yamada
We study the Witten effect of hidden monopoles on the QCD axion dynamics, and show that its abundance as well as isocurvature perturbations can be significantly suppressed if there…
Cosmological Problems of the String Axion Alleviated by High Scale SUSY of 10-100 TeV
Masahiro Kawasaki, Tsutomu T. Yanagida, Norimi Yokozaki
The string axion may provide the most attractive solution to the strong CP problem in QCD. However, the axion energy density easily exceeds the dark matter density in the present u…