798 research outputs found
Treatment of Electrical Storm with Amiodarone in Brugada Syndrome- an Unexpected Protective Effect
We are reporting on a 53 year old man with proven Brugada syndrome and ICD implantation for resuscitation in context of polymorphic VT. After recurrent arrhythmia he was treated with Amiodarone. This showed to have a protective effect despite various reports suggesting avoiding Amiodarone in Brugada syndrome
Primordial magnetic fields and gravitational baryogenesis in nonlinear electrodynamics
The amplification of the primordial magnetic fields and the gravitational
baryogenesis, a mechanism that allows to generate the baryon asymmetry in the
Universe by means of the coupling between the Ricci scalar curvature and the
baryon current, are reviewed in the framework of the nonlinear electrodynamics.
To study the amplification of the primordial magnetic field strength, we write
down the gauge invariant wave equations and then solve them (in the long
wavelength approximation) for three different eras of the Universe: de Sitter,
the reheating and the radiation dominated era. Constraints on parameters
entering the nonlinear electrodynamics are obtained by using the amplitude of
the observed galactic magnetic fields and the baryon asymmetry, which are
characterized by the dimensionless parameters and
, respectively.Comment: 10 pages, 3 tables, 6 figures. Accepted for publication in Physical
Review
Asymptotic Freedom in Curvature-Satured Gravity
For a spatially flat Friedmann model with line element , the 00-component of the Einstein field equation
reads containing no derivative. For a nonlinear
Lagrangian , we obtain a second--order differential equation for
instead of the expected fourth-order equation. We discuss this equation for
the curvature-saturated model proposed by Kleinert and Schmidt. Finally, we
argue that asymptotic freedom is fulfilled in
curvature-saturated gravity.Comment: 9 pages, World Scientific LATEX, to appear in "Fluctuating Paths and
Fields", WSPC Singapore 2001, Eds: W. Janke, A. Pelster, H.-J. Schmidt, M.
Bachman
Cerenkov's Effect and Neutrino Oscillations in Loop Quantum Gravity
Bounds on the scale parameter {\cal L} arising in loop quantum gravity theory
are derived in the framework of Cerenkov's effect and neutrino oscillations.
Assuming that {\cal L} is an universal constant, we infer {\cal L}>
10^{-18}eV^{-1}, a bound compatible with ones inferred in different physical
context.Comment: 6 pages, no figures, in print on MPL
Leptogenesis from Spin-Gravity Coupling Following Inflation
The energy levels of the left and the right handed neutrinos is split in the
background of gravitational waves generated during inflation which in presence
of lepton number violating interactions gives rise to a net lepton asymmetry at
equilibrium. Lepton number violation is achieved by the same dimension five
operator which gives rise to neutrino masses after electro-weak symmetry
breaking. A net baryon asymmetry of the same magnitude can be generated from
this lepton asymmetry by electroweak sphaleron processes.Comment: Journal version (accepted for publication in Phys. Rev. Lett.
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