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Stationary Spacetime from Intersecting M-branes
Makoto Tanabe, Kei-ichi Maeda
We study a stationary "black" brane in M/superstring theory. Assuming BPS-type relations between the first-order derivatives of metric functions, we present general stationary blac…
Three Dimensional Simulation of Gamma Ray Emission from Asymmetric Supernovae and Hypernovae
K. Maeda
Hard X- and -ray spectra and light curves resulting from radioactive decays are computed for aspherical (jet-like) and energetic supernova models (representing a prototypical hy…
Cosmological Co-evolution of Yang-Mills Fields and Perfect Fluids
John D. Barrow, Yoshida Jin, Kei-ichi Maeda
We study the co-evolution of Yang-Mills fields and perfect fluids in Bianchi type I universes. We investigate numerically the evolution of the universe and the Yang-Mills fields du…
Nebular Spectra of SN 1998bw Revisited: Detailed Study by One and Two Dimensional Models
K. Maeda, K. Nomoto, P. A. Mazzali +1
Refined one- and two-dimensional models for the nebular spectra of the hyper-energetic Type Ic supernova (SN) 1998bw, associated with the gamma-ray burst GRB980425, from 125 to 376…
The first chemical enrichment in the universe and the formation of hyper metal-poor stars
Nobuyuki Iwamoto, Hideyuki Umeda, Nozomu Tominaga +2
The recent discovery of a hyper metal-poor (HMP) star, whose metallicity Fe/H is smaller than 1/100,000 of the solar ratio, together with one earlier HMP star, has raised a challen…
Chemical Abundances in the Secondary Star of the Neutron Star Binary Centaurus X-4
Jonay I. González Hernández, Rafael Rebolo, Garik Israelian +4
Using a high resolution spectrum of the secondary star in the neutron star binary {Cen X-4}, we have derived the stellar parameters and veiling caused by the accretion disk in a co…