48 research outputs found
The Energy of Regular Black Hole in General Relativity Coupled to Nonlinear Electrodynamics
According to the Einstein, Weinberg, and M{\o}ller energy-momentum complexes,
we evaluate the energy distribution of the singularity-free solution of the
Einstein field equations coupled to a suitable nonlinear electrodynamics
suggested by Ay\'{o}n-Beato and Garc\'{i}a. The results show that the energy
associated with the definitions of Einstein and Weinberg are the same, but
M{\o}ller not. Using the power series expansion, we find out that the first two
terms in the expression are the same as the energy distributions of the
Reissner-Nordstr\"{o}m solution, and the third term could be used to survey the
factualness between numerous solutions of the Einstein field eqautions coupled
to a nonlinear electrodynamics.Comment: 11 page
Energy-Momentum Localization for a Space-Time Geometry Exterior to a Black Hole in the Brane World
In general relativity one of the most fundamental issues consists in defining
a generally acceptable definition for the energy-momentum density. As a
consequence, many coordinate-dependent definitions have been presented, whereby
some of them utilize appropriate energy-momentum complexes. We investigate the
energy-momentum distribution for a metric exterior to a spherically symmetric
black hole in the brane world by applying the Landau-Lifshitz and Weinberg
prescriptions. In both the aforesaid prescriptions, the energy thus obtained
depends on the radial coordinate, the mass of the black hole and a parameter
, while all the momenta are found to be zero. It is shown that for
a special value of the parameter , the Schwarzschild space-time
geometry is recovered. Some particular and limiting cases are also discussed.Comment: 10 pages, sections 1 and 3 slightly modified, references modified and
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Hidden vector dark matter
We show that dark matter could be made of massive gauge bosons whose
stability doesn't require to impose by hand any discrete or global symmetry.
Stability of gauge bosons can be guaranteed by the custodial symmetry
associated to the gauge symmetry and particle content of the model. The
particle content we consider to this end is based on a hidden sector made of a
vector multiplet associated to a non-abelian gauge group and of a scalar
multiplet charged under this gauge group. The hidden sector interacts with the
Standard Model particles through the Higgs portal quartic scalar interaction in
such a way that the gauge bosons behave as thermal WIMPS. This can lead easily
to the observed dark matter relic density in agreement with the other various
constraints, and can be tested experimentally in a large fraction of the
parameter space. In this model the dark matter direct detection rate and the
annihilation cross section can decouple if the Higgs portal interaction is
weak.Comment: 13 pages, 7 figures, JHEP published version (2009) + update of
section 7 (reference to arXiv:0912.4496
Determinants of penetrance and variable expressivity in monogenic metabolic conditions across 77,184 exomes
Hundreds of thousands of genetic variants have been reported to cause severe monogenic diseases, but the probability that a variant carrier develops the disease (termed penetrance) is unknown for virtually all of them. Additionally, the clinical utility of common polygenetic variation remains uncertain. Using exome sequencing from 77,184 adult individuals (38,618 multi-ancestral individuals from a type 2 diabetes case-control study and 38,566 participants from the UK Biobank, for whom genotype array data were also available), we apply clinical standard-of-care gene variant curation for eight monogenic metabolic conditions. Rare variants causing monogenic diabetes and dyslipidemias display effect sizes significantly larger than the top 1% of the corresponding polygenic scores. Nevertheless, penetrance estimates for monogenic variant carriers average 60% or lower for most conditions. We assess epidemiologic and genetic factors contributing to risk prediction in monogenic variant carriers, demonstrating that inclusion of polygenic variation significantly improves biomarker estimation for two monogenic dyslipidemias
Gallstone Disease After Laparoscopic Sleeve Gastrectomy in an Asian Population—What Proportion of Gallstones Actually Becomes Symptomatic?
10.1007/s11695-017-2657-yObesity Surgery2792419-2423OBSU
Anaesthesia considerations and techniques for Pressurised IntraPeritoneal Aerosol Chemotherapy (PIPAC)
10.1515/pp-2019-0013Pleura and Peritoneum542019001