4,256 research outputs found
Abelian Vectors and Self-Dual Tensors in Six-Dimensional Supergravity
In this note we describe the most general coupling of {\it abelian} vector
and tensor multiplets to six-dimensional supergravity. As was recently
pointed out, it is of interest to consider more general Chern-Simons couplings
to abelian vectors of the type , with
matrices that may not be simultaneously diagonalized. We show that
these couplings can be related to Green-Schwarz terms of the form , and how the complete local Lagrangian, that embodies factorized gauge
and supersymmetry anomalies (to be disposed of by fermion loops) is uniquely
determined by Wess-Zumino consistency conditions, aside from an arbitrary
quartic coupling for the gauginos.Comment: LaTeX file, 10 pages. Some equations, previously written with wrong
notations, are correcte
A Catalogue of Galaxies in the HDF-South: Photometry and Structural Parameters
We describe the construction of a catalogue of galaxies in the optical field
of the Hubble Deep Field South. The HDF-S observations produced WFPC2 images in
U, B, V, and I, the version 1 data have been made public on 23 November 1999.
The effective field of view is 4.38 arcmin, and the 5 limiting
magnitudes (in a FWHM aperture) are 28.87, 29.71, 30.19, 29.58 in the U, B, V
and I bands, respectively. We created a catalogue for each pass-band
(I, V, B, U), using simulations to account for
incompleteness and spurious sources contamination. Along with photometry in all
bands, we determined on the I-selected catalogue (I)
structural parameters, such as a metric apparent size, derived from the
petrosian radius, an asymmetry index, light concentration indexes and the mean
surface brightness within the petrosian radius.Comment: 10 pages, 11 figures. Accepted for publication in A&ASS. The catalog
is available in the source and at
http://www.merate.mi.astro.it/~saracco/science.htm
Quantum Cost Optimization for Reversible Sequential Circuit
Reversible sequential circuits are going to be the significant memory blocks
for the forthcoming computing devices for their ultra low power consumption.
Therefore design of various types of latches has been considered a major
objective for the researchers quite a long time. In this paper we proposed
efficient design of reversible sequential circuits that are optimized in terms
of quantum cost, delay and garbage outputs. For this we proposed a new 3*3
reversible gate called SAM gate and we then design efficient sequential
circuits using SAM gate along with some of the basic reversible logic gates.Comment: Quantum 4.12 (2013). arXiv admin note: substantial text overlap with
arXiv:1312.735
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