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Black Hole in the Expanding Universe from Intersecting Branes
Kei-ichi Maeda, Masato Nozawa
We study physical properties and global structures of a time-dependent, spherically symmetric solution obtained via the dimensional reduction of intersecting M-branes. We find that…
Black Holes in an Expanding Universe
Gary W. Gibbons, Kei-ichi Maeda
An exact solution representing black holes in an expanding universe is found. The black holes are maximally charged and the universe is expanding with arbitrary equation of state.…
Formation and Evolution of Dust in Type IIb Supernova with Application to the Cassiopeia A Supernova Remnant
Takaya Nozawa, Takashi Kozasa, Nozomu Tominaga +4
We investigate the formation of dust grains in the ejecta of a SN IIb and their evolution in the shocked gas in the SNR by considering the uniform and power-law density structures…
The Bernstein Conjecture, Minimal Cones, and Critical Dimensions
Gary W. Gibbons, Kei-ichi Maeda, Umpei Miyamoto
Minimal surfaces and domain walls play important roles in various contexts of spacetime physics as well as material science. In this paper, we first review the Bernstein conjecture…
Black Hole Solutions in String Theory with Gauss-Bonnet Curvature Correction
Kei-ichi Maeda, Nobuyoshi Ohta, Yukinori Sasagawa
We present the black hole solutions and analyse their properties in the superstring effective field theory with the Gauss-Bonnet curvature correction terms. We find qualitative dif…
Spectropolarimetry of Extremely Luminous Type Ia Supernova 2009dc: Nearly Spherical Explosion of Super-Chandrasekhar Mass White Dwarf
Masaomi Tanaka, Koji S. Kawabata, Masayuki Yamanaka +8
We present the first spectropolarimetric observations of a candidate of super-Chandrasekhar mass Type Ia supernova (SN): SN 2009dc. The observations were performed at 5.6 and 89.5…