25,053 research outputs found
Comments on supersymmetric renormalization in two-dimensional curved spacetime
In this technical note we introduce a manifestly gauge-invariant and
supersymmetric procedure to regularize and renormalize one-loop divergences of
chiral multiplets in two-dimensional N=(2,2) theories in curved spacetime. We
apply the method, a version of Pauli-Villars regularization, to known examples
of supersymmetric localization and demonstrate that the partition functions are
renormalized. An accompanying ancillary file, a Mathematica notebook,
implements the relevant supergravity transformations.Comment: 19 pages, comes with a Mathematica notebook; version 2: counterterm
action slightly improved, comments and references added, typos correcte
Derivation of Calabi-Yau Crystals from Chern-Simons Gauge Theory
We derive new crystal melting models from Chern-Simons theory on the
three-sphere. Via large N duality, these models compute amplitudes for A-model
on the resolved conifold. The crystal is bounded by two walls whose distance
corresponds to the Kahler modulus of the geometry. An interesting phenomenon is
found where the Kahler modulus is shifted by the presence of non-compact
D-branes. We also discuss the idea of using the crystal models as means of
proving more general large N dualities to all order in .Comment: 18 pages, 5 figures; v.2 typos corrected, references added; v.3 minor
typos corrected, a confusing expression modifie
Super-Eddington Black-Hole Models for SS 433
We examine highly super-Eddington black-hole models for SS 433, based on
two-dimensional hydrodynamical calculations coupled with radiation transport.
The super-Eddington accretion flow with a small viscosity parameter,
, results in a geometrically and optically thick disk with
a large opening angle of to the equatorial plane and a very
rarefied, hot, and optically thin high-velocity jets region around the disk.
The thick accretion flow consists of two different zones: an inner
advection-dominated zone and an outer convection-dominated zone. The
high-velocity region around the disk is divided into two characteristic
regions, a very rarefied funnel region along the rotational axis and a
moderately rarefied high-velocity region outside of the disk. The temperatures
of K and the densities of g cm in the upper
disk vary sharply to K and g cm, respectively,
across the disk boundary between the disk and the high-velocity region. The
X-ray emission of iron lines would be generated only in a confined region
between the funnel wall and the photospheric disk boundary, where flows are
accelerated to relativistic velocities of 0.2 due to the dominant
radiation-pressure force. The results are discussed regarding the collimation
angle of the jets, the large mass-outflow rate obserevd in SS 433, and the
ADAFs and the CDAFs models.Comment: 19 pages, 11 figures, to be published in Publ. Astron. Soc. Japan,
200
Mirror symmetry and the flavor vortex operator in two dimensions
The flavor vortex operator is a local disorder operator defined by
coupling a two-dimensional chiral multiplet to a
non-dynamical gauge field with vortex singularity of holonomy . We
show that it is related to the mirror-dual twisted chiral multiplet, with
bottom component , as .Comment: 6 page
Generation of field-aligned current in the auroral zone
Generation of a magnetic field-aligned current in the auroral zone connecting the magnetospheric and ionospheric plasmas has been studied by means of a three dimensional particle simulation model. The model is of a magnetostatic variety appropriate for a low beta plasma in which the high frequency transverse displacement current has been eliminated. The simulation model is highly elongated along the magnetic field lines in order to model a highly elongated flux tube in the auroral zone. An enhanced field-aligned current was generated by injection of a magnetospheric plasma across the auroral zone magnetic field at the center of the model. Such a plasma injection may correspond to a plasmoid injection at the geomagnetic tail associated with magnetic reconnection during a substorm or a transverse plasma flow along the low latitude magnetopause boundary layer. The results of the simulations show that the field-aligned current can be enhanced over the thermal current by a factor of 5 - 10 via such injection. Associated with the enhanced current are the electrostatic ion cyclotron waves and shear Alfven waves excited in the auroral zone
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