6,688 research outputs found
Geometric Cone Surfaces and (2+1)- Gravity coupled to Particles
We introduce the (2+1)-spacetimes with compact space of genus g and with r
gravitating particles which arise by ``Minkowskian suspensions of flat or
hyperbolic cone surfaces'', by ``distinguished deformations'' of hyperbolic
suspensions and by ``patchworking'' of suspensions. Similarly to the
matter-free case, these spacetimes have nice properties with respect to the
canonical Cosmological Time Function. When the values of the masses are
sufficiently large and the cone points are suitably spaced, the distinguished
deformations of hyperbolic suspensions determine a relevant open subset of the
full parameter space; this open subset is homeomorphic to the product of an
Euclidean space of dimension 6g-6+2r with an open subset of the Teichm\"uller
Space of Riemann surfaces of genus g with r punctures. By patchworking of
suspensions one can produce examples of spacetimes which are not distinguished
deformations of any hyperbolic suspensions, although they have the same masses;
in fact, we will guess that they belong to different connected components of
the parameter space.Comment: 14 pages Late
Fresh inflation: a warm inflationary model from a zero temperature initial state
A two-components mixture fluid which complies with the gamma law is
considered in the framework of inflation with finite temperature. The model is
developed for a quartic scalar potential without symmetry breaking. The
radiation energy density is assumed to be zero when inflation starts and
remains below the GUT temperature during the inflationary stage. Furthermore,
provides the necessary number of e-folds and sufficient radiation energy
density to GUT baryogenesis can take place near the minimum energetic
configuration.Comment: 11 pages, no figures, to be published in Phys. Rev.
Improved Limit on theta_{13} and Implications for Neutrino Masses in Neutrino-less Double Beta Decay and Cosmology
We analyze the impact of a measurement, or of an improved bound, on
theta_{13} for the determination of the effective neutrino mass in
neutrino-less double beta decay and cosmology. In particular, we discuss how an
improved limit on (or a specific value of) theta_{13} can influence the
determination of the neutrino mass spectrum via neutrino-less double beta
decay. We also discuss the interplay with improved cosmological neutrino mass
searches.Comment: 22 pages, 5 figures. Minor corrections, matches version in PR
A probabilistic approach to composite micromechanics
Probabilistic composite micromechanics methods are developed that simulate expected uncertainties in unidirectional fiber composite properties. These methods are in the form of computational procedures using Monte Carlo simulation. A graphite/epoxy unidirectional composite (ply) is studied to demonstrate fiber composite material properties at the micro level. Regression results are presented to show the relative correlation between predicted and response variables in the study
(2+1)-Gravity with Moving Particles in an Instantaneous Gauge
By defining a regular gauge which is conformal-like and provides
instantaneous field propagation, we investigate classical solutions of
(2+1)-Gravity coupled to arbitrarily moving point-like particles. We show how
to separate field equations from self-consistent motion and we provide a
solution for the metric and the motion in the two-body case with arbitrary
speed, up to second order in the mass parameters.Comment: 16 pages, LaTeX, no figure
Non-Perturbative Particle Dynamics
We construct a non-perturbative, single-valued solution for the metric and
the motion of two interacting particles in ()-Gravity, by using a Coulomb
gauge of conformal type. The method provides the mapping from multivalued (
minkowskian ) coordinates to single-valued ones, which solves the non-abelian
monodromies due to particles's momenta and can be applied also to the general
N-body case.Comment: 11 pages, LaTeX, no figure
Non-perturbative scalar gauge-invariant metric fluctuations from the Ponce de Leon metric in the STM theory of gravity
We study our non-perturbative formalism to describe scalar gauge-invariant
metric fluctuations by extending the Ponce de Leon metric.Comment: accepted in Eur. Phys. J.
Remaining inconsistencies with solar neutrinos: can spin flavour precession provide a clue?
A few inconsistencies remain after it has been ascertained that LMA is the
dominant solution to the solar neutrino problem: why is the SuperKamiokande
spectrum flat and why is the Chlorine rate prediction over two standard
deviations above the data. There also remains the ananswered and important
question of whether the active neutrino flux is constant or time varying. We
propose a scenario involving spin flavour precession to sterile neutrinos with
three active flavours that predicts a flat SuperK spectrum and a Chlorine rate
prediction more consistent with data. We also argue that running the Borexino
experiment during the next few years may provide a very important clue as to
the possible variability of the solar neutrino flux.Comment: 3 pages, 2 figures, contribution to TAUP 2009 (Rome
A Quantization of 2+1-Gravity Related to High-Energy Yang-Mills Theory
We point out that canonical quantization of the two-body problem in
2+1-Gravity is related to the high-energy equation in Yang-Mills theory by a
proper ordering of the relevant operators. This feature arises from expanding
the Hamiltonian around its conformal limit - or treating running coupling
effects in the Yang-Mills case - and yields a peculiar short distance behaviour
of the wave functions.Comment: 11 page
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