19,624 research outputs found
Generalized Teleparallel Theory
We construct a theory in which the gravitational interaction is described
only by torsion, but that generalizes the Teleparallel Theory still keeping the
invariance of local Lorentz transformations in one particular case. We show
that our theory falls, to a certain limit of a real parameter, in the
Gravity or, to another limit of the same real parameter, in a
modified Gravity, interpolating between these two theories and still can
fall on several other theories. We explicitly show the equivalence with
Gravity for cases of Friedmann-Lemaitre-Robertson-Walker flat
metric for diagonal tetrads, and a metric with spherical symmetry for diagonal
and non-diagonal tetrads. We do still four applications, one in the
reconstruction of the de Sitter universe cosmological model, for obtaining a
static spherically symmetric solution type-de Sitter for a perfect fluid, for
evolution of the state parameter and for the thermodynamics to
the apparent horizon.Comment: 15 pages. arXiv admin note: text overlap with arXiv:1503.07427,
arXiv:1503.0785
An inspection on the Borel masses relation used in QCD sum rules
In this work, we studied the Borel masses relation used in QCDSR
calculations. These masses are the parameters of the Borel transform used when
the three point function is calculated. We analised an usual and a more general
linear relations. We concluded that a general linear relation between these
masses provides the best results regarding the standard deviation.Comment: 6 pages, 2 figures, Prepared for 11th Hadron Physic
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