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19 papers · 1 filter
Deformation of N=4 Super Yang-Mills Theory in Graviphoton Background
Katsushi Ito, Yoshishige Kobayashi, Shin Sasaki
We study deformation of N=4 super Yang-Mills theory from type IIB superstrings with D3-branes in the constant R-R background. We compute disk amplitudes with one graviphoton vertex…
Dead Zone Formation and Nonsteady Hyperaccretion in Collapsar Disks : A Possible Origin of Short-Term Variability in the Prompt Emission of Gamma-Ray Bursts
Youhei Masada, Norita Kawanaka, Takayoshi Sano +1
The central engine of gamma-ray bursts (GRBs) is believed to be a hot and dense disk with hyperaccretion onto a few solar-mass black hole. We investigate where the magnetorotationa…
Heavy flavor physics from lattice QCD
Tetsuya Onogi
I review the recent status of heavy flavor physics results from lattice QCD. In particular, I focus on the heavy-light decay constants, the bag parameters, the form factors, and th…
Black hole accretion: theoretical limits and observational implications
D. Heinzeller, W. J. Duschl, S. Mineshige +1
Recently, the issue of the role of the Eddington limit in accretion discs became a matter of debate. While the classical (spherical) Eddington limit is certainly an over-simplifica…
SU(N) Self-Dual Sine-Gordon Model and Competing Orders
P. Lecheminant, K. Totsuka
We investigate the low-energy properties of a generalized quantum sine-Gordon model in one dimension with a self-dual symmetry. This model describes a class of quantum phase transi…
Roles of Z_2-odd N=1 multiplets in off-shell dimensional reduction of 5D supergravity
Hiroyuki Abe, Yutaka Sakamura
We discuss the dimensional reduction of five-dimensional supergravity compactified on S^1/Z_2 keeping the N=1 off-shell structure. Especially we clarify the roles of the Z_2-odd N=…