3,065 research outputs found
COUPLING CHIRAL BOSONS TO GRAVITY
The chiral boson actions of Floreanini and Jackiw (FJ), and of McClain,Wu and
Yu (MWY) have been recently shown to be different representations of the same
chiral boson theory. MWY displays manifest covariance and also a (gauge)
symmetry that is hidden in the FJ side, which, on the other hand, displays the
physical spectrum in a simple manner. We make use of the covariance of the MWY
representation for the chiral boson to couple it to background gravity showing
explicitly the equivalence with the previous results for the FJ representationComment: 8 pages, Latex, no figure
Chiral Bosons as solutions of the BV master equation 2D chiral gauge theories
We construct the chiral Wess-Zumino term as a solution for the
Batalin-Vilkovisky master equation for anomalous two-dimensional gauge
theories, working in an extended field-antifield space, where the gauge group
elements are introduced as additional degrees of freedom.
We analyze the Abelian and the non-Abelian cases, calculating in both cases
the BRST generator in order to show the physical equivalence between this
chiral solution for the master equation and the usual (non-chiral) one.Comment: 11 pages, TEX dialet, IF/UFRJ-94-
Nonequivalent Seiberg-Witten maps for noncommutative massive U(N) gauge theory
Massive vector fields can be described in a gauge invariant way with the
introduction of compensating fields. In the unitary gauge one recovers the
original formulation. Although this gauging mechanism can be extended to
noncommutative spaces in a straightforward way, non trivial aspects show up
when we consider the Seiberg-Witten map. As we show here, only a particular
class of its solutions leads to an action that admits the unitary gauge fixing.Comment: General solutions for the map and important reference included, 6
pages, no figure
Static strings in Randall-Sundrum scenarios and the quark anti-quark potential
We calculate the energy of a static string in an AdS slice between two
D3-branes with orbifold condition. The energy for configurations with endpoints
on a brane grows linearly for large separation between these points. The
derivative of the energy has a discontinuity at some critical separation.
Choosing a particular position for one of the branes we find configurations
with smooth energy. In the limit where the other brane goes to infinity the
energy has a Coulombian behaviour for short separations and can be identified
with the Cornell potential for a quark anti-quark pair. This identification
leads to effective values for the AdS radius, the string tension and the
position of the infrared brane. These results suggest an approximate duality
between static strings in an AdS slice and a heavy quark anti-quark
configuration in a confining gauge theory.Comment: More clarifications added, typos corrected. Results unchange
Cultivo de sapoti e sapota sob irrigação localizada no litoral cearense.
Este trabalho tem como objetivo observar a adaptação do sapotizeiro no litoral cearense e a viabilidade técnica do seu cultivo sob irrigação.bitstream/CNPAT-2010/11958/1/Ct-051.pd
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