1,233 research outputs found
Phase structure of many flavor lattice QCD at finite temperature
In realistic technicolor models containing many fermions, the electroweak
baryogenesis offers a natural scenario for generating baryon number asymmetry.
One of the key ingredients is the occurrence of the first order phase
transition at finite temperature. As a first step toward the exploration of
this possibility on the lattice, we develop an agile method to identify the
critical mass for a given Nf, separating the first order and the crossover
transition. We explain the outline of our method and demonstrate it by
determining the critical mass of Nf-flavors in the presence of light
two-flavors. It is found that the critical mass becomes larger with Nf.Comment: 7 pages, 3 figures. Contribution to SCGT12 "KMI-GCOE Workshop on
Strong Coupling Gauge Theories in the LHC Perspective", 4-7 Dec. 2012, Nagoya
Universit
General Relativistic MHD Simulations of the Gravitational Collapse of a Rotating Star with Magnetic Field as a Model of Gamma-Ray Bursts
We have performed 2.5-dimensional general relativistic magnetohydrodynamic
(MHD) simulations of the gravitational collapse of a magnetized rotating
massive star as a model of gamma ray bursts (GRBs). This simulation showed the
formation of a disk-like structure and the generation of a jet-like outflow
inside the shock wave launched at the core bounce. We have found the jet is
accelerated by the magnetic pressure and the centrifugal force and is
collimated by the pinching force of the toroidal magnetic field amplified by
the rotation and the effect of geometry of the poloidal magnetic field. The
maximum velocity of the jet is mildly relativistic ( 0.3 c).Comment: 4 pages, 1 figure, aipTEX, contribution to the 2003 GRB Conference,
held at Santa Fe, N
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