26 research outputs found
Towards a new quantization of Dirac's monopole
There are several mathematical and physical reasons why Dirac's quantization
must hold. How far one can go without it remains an open problem. The present
work outlines a few steps in this direction.Comment: To appear in Proceedings of "IV Taller de la Division de Gravitacion
y Fisica Matematica". Misprints corrected, references and acknowledgments
adde
On representations of the rotation group and magnetic monopoles
Recently (Phys. Lett. A302 (2002) 253, hep-th/0208210; hep-th/0403146)
employing bounded infinite-dimensional representations of the rotation group we
have argued that one can obtain the consistent monopole theory with generalized
Dirac quantization condition, , where is the
weight of the Dirac string. Here we extend this proof to the unbounded
infinite-dimensional representations.Comment: References adde
Gravitational waves during Higgs inflation from complex geometrical scalar-tensor theory of gravity
In this paper we investigate tensor fluctuations of the metric at the end of
a Higgs inflationary period in the context of a recently introduced complex
geometrical scalar-tensor theory of gravity. In our model the Higgs field has a
geometrical origin and the affine connection is determined by the Palatini's
principle. Additionally, we consider an extra contribution to the
tensor-fluctuations equation coming from the vacuum term in the energy momentum
tensor associated to the Higgs field. The Higgs potential is rescaled by the
non-canonicity function of the kinetic term of the field which is modified by
the symmetry group of the background geometry. We obtain a nearly scale
invariant spectrum and a scalar to tensor ratio in agreement with PLANCK 2018
cosmological results.Comment: 9 pages, 2 figure
Scaling Relations in Dissipationless Spiral-like Galaxy Mergers
We determine both representations of the Fundamental Plane [Re Sig^a Ie^b and
Re (Sig^2/Ie)^lambda] and the luminosity-effective phase space density [L
fe^(-gamma)] scaling relation for N-body remnants of binary mergers of
spiral-like galaxies. The main set of merger simulations involves a mass-ratio
of the progenitors in the range of about 1:1 to 1:5, harboring or not a
bulge-like component, and are constructed using a cosmological motivated model.
Equal-mass mergers are also considered. Remnants lead to average values for the
scaling indices of ~1.6, ~0.6, ~0.7, and ~0.65. These
values are consistent with those of K--band observations (Mobasher et al. 1999)
of ellipticals: ~1.5, ~0.8, ~0.7, and ~0.60. The b index
is, however, not well reproduced. This study does not allow us to establish a
conclusive preference for models with or without a bulge as progenitors. Our
results indicate that the L--fe and FP scalings might be determined to a large
extent by dissipationless processes, a result that appears to be in
contradiction to other dissipationless results.Comment: 8 pages and 2 figures. Accepted for publication in Ap