3,448 research outputs found
Current Algebra of Super WZNW Models
We derive the current algebra of supersymmetric principal chiral models with
a Wess-Zumino term. At the critical point one obtains two commuting super
Kac-Moody algebra as expected, but in general there are intertwining fields
connecting both right and left sectors, analogously to the bosonic case.
Moreover, in the present supersymmetric extension we have a quadratic algebra,
rather than an affine Lie algebra, due to the mixing between bosonic and
fermionic fields since the purely fermionic sector displays a Lie algebra as
well.Comment: 13 page
An effective Hamiltonian for 2D black hole Physics
In another application of the methods of Henneaux, Teitelboim, and Vergara
developed for diffeomorphisms invariant models, the CGHS theory of 2D black
holes is focused in order to obtain the true degrees of freedom, the simplectic
structure and the {\it effective} Hamiltonian that rules the dynamics in
reduced phase-space.Comment: To appear in Europhysics Letter
Integrable models: from dynamical solutions to string theory
We review the status of integrable models from the point of view of their
dynamics and integrability conditions. Some integrable models are discussed in
detail. We comment on the use it is made of them in string theory. We also
discuss the Bethe Ansatz solution of the SO(6) symmetric Hamiltonian with SO(6)
boundary.
This work is especially prepared for the seventieth anniversaries of
Andr\'{e} Swieca (in memoriam) and Roland K\"{o}berle.Comment: 24 pages, to appear in Brazilian Journal of Physic
TFD Approach to Bosonic Strings and -branes
In this work we explain the construction of the thermal vacuum for the
bosonic string, as well that of the thermal boundary state interpreted as a
-brane at finite temperature. In both case we calculate the respective
entropy using the entropy operator of the Thermo Field Dynamics Theory. We show
that the contribution of the thermal string entropy is explicitly present in
the -brane entropy. Furthermore, we show that the Thermo Field approach
is suitable to introduce temperature in boundary states.Comment: 6 pages, revtex, typos are corrected. Prepared for the Second
Londrina Winter School-Mathematical Methods in Physics, August 25-30, 2002,
Londrina-Pr, Brazil. To appear in a special issue of IJMP
Remarks on Screening in a Gauge-Invariant Formalism
In this paper we display a direct and physically attractive derivation of the
screening contribution to the interaction potential in the Chiral Schwinger
model and generalized Maxwell-Chern-Simons gauge theory. It is shown that these
results emerge naturally when a correct separation between gauge-invariant and
gauge degrees of freedom is made. Explicit expressions for gauge-invariant
fields are found.Comment: 13 pages, 1 figure, to appear in PR
A solution to the zero-hamiltonian problem in 2-D gravity
The zero-hamiltonian problem, present in reparametrization invariant systems,
is solved for the 2-D induced gravity model. Working with methods developed by
Henneaux et al. we find systematically the reduced phase-space physics,
generated by an {\it effective} hamiltonian obtained after complete gauge
fixing.Comment: 5 pages, revte
Forage quality and methane production of the grazing portion of grass produced under elevated [CO2].
The potential changes in nutritional quality of forages for livestock production under climate changes scenario are still scarce, despite recent works have shown that the elevated [CO2] increased biomass production, in grass lesser than in legume. This work aimed to determine the effects of season and enhanced [CO2] under Free-Air Carbon Dioxide Enrichment (FACE) condition
Biomass production, elemental and fibre composition of Brachiaria produced under free air carbon dioxide enrichment conditions.
Realistic fluids as source for dynamically accreting black holes in a cosmological background
We show that a single imperfect fluid can be used as a source to obtain the
generalized McVittie metric as an exact solution to Einstein's equations. The
mass parameter in this metric varies with time thanks to a mechanism based on
the presence of a temperature gradient. This fully dynamical solution is
interpreted as an accreting black hole in an expanding universe if the metric
asymptotes to Schwarzschild-de Sitter at temporal infinity. We present a simple
but instructive example for the mass function and briefly discuss the structure
of the apparent horizons and the past singularity.Comment: 5 pages, 2 figures. Updated references and minor changes to match the
version accepted for publishing in PR
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