92 citations · 687 across the 12 of their papers we have counts for
5 papers · 1 filter
Numerical Study on GRB-Jet Formation in Collapsars
Shigehiro Nagataki, Rohta Takahashi, Akira Mizuta +1
Two-dimensional magnetohydrodynamic simulations are performed using the ZEUS-2D code to investigate the dynamics of a collapsar that generates a GRB jet, taking account of realisti…
Collimated Jet or Expanding Outflow: Possible Origins of GRBs and X-Ray Flashes
Akira Mizuta, Tatsuya Yamasaki, Shigehiro Nagataki +1
We investigate the dynamics of an injected outflow propagating in a progenitor in the context of the collapsar model for gamma-ray bursts (GRBs) through two dimensional axisymmetri…
High Energy Neutrino Flashes from Far-Ultraviolet and X-ray Flares in Gamma-Ray Bursts
Kohta Murase, Shigehiro Nagataki
The recent observations of bright optical and x-ray flares by the Swift satellite suggest these are produced by the late activities of the central engine. We study the neutrino emi…
Very High Energy Neutrinos Originating from Kaons in Gamma-Ray Bursts
K. Asano, S. Nagataki
We simulate neutrino production in a gamma-ray burst (GRB) with the most detailed method to date. We show that the highest energy neutrinos from GRBs mainly come from kaons. Althou…
Mass spectrum of primordial black holes from inflationary perturbation in the Randall-Sundrum braneworld: a limit on blue spectra
Yuuiti Sendouda, Shigehiro Nagataki, Katsuhiko Sato
The mass spectrum of the primordial black holes formed by density perturbation in the radiation-dominated era of the Randall-Sundrum type-2 cosmology is given. The spectrum coincid…