554 research outputs found
Maximal Acceleration Limits on the Mass of the Higgs Boson
Caianiello's quantum geometrical model with maximal acceleration places the
upper limit GeV on the mass of the Higgs boson. The model also
provides an equation linking the mass of the W boson to the Higgs mass
and independent symmetry breaking and mass generating mechanisms. These may
further restrict the value of .Comment: LaTex file, 13 pages, to be published in Il Nuovo Cimento
Generalized Uncertainty Principle from Quantum Geometry
The generalized uncertainty principle of string theory is derived in the
framework of
Quantum Geometry by taking into account the existence of an upper limit on
the acceleration of massive particles.Comment: 9 pages, LATEX file, to appear in Int. Jou. Theor. Phy
Microlensing Parallax for Observers in Heliocentric Motion
Motivated by the ongoing Spitzer observational campaign, and the forecoming
K2 one, we revisit, working in an heliocentric reference frame, the geometrical
foundation for the analysis of the microlensing parallax, as measured with the
simultaneous observation of the same microlensing event from two observers with
relative distance of order AU. For the case of observers at rest we discuss the
well known fourfold microlensing parallax degeneracy and determine an equation
for the degenerate directions of the lens trajectory. For the case of observers
in motion, we write down an extension of the Gould (1994) relationship between
the microlensing parallax and the observable quantities and, at the same time,
we highlight the functional dependence of these same quantities from the
timescale of the underlying microlensing event. Furthermore, through a series
of examples, we show the importance of taking into account the motion of the
observers to correctly recover the parameters of the underlying microlensing
event. In particular we discuss the cases of the amplitude of the microlensing
parallax and that of the difference of the timescales between the observed
microlensing events, key to understand the breaking of the microlensing
parallax degeneracy. Finally, we consider the case of the simultaneous
observation of the same microlensing event from ground and two satellites, a
case relevant for the expected joint K2 and Spitzer observational programs in
2016.Comment: Accepted for publication in Ap
Neutrino optics and oscillations in gravitational fields
We study the propagation of neutrinos in gravitational fields using wave
functions that are exact to first order in the metric deviation. For
illustrative purposes, the geometrical background is represented by the
Lense-Thirring metric. We derive explicit expressions for neutrino deflection,
helicity transitions, flavor oscillations and oscillation Hamiltonian.Comment: 16 page
Casimir energy of a dilute dielectric ball at zero and finite temperature
The basic results in calculations of the thermodynamic functions of
electromagnetic field in the background of a dilute dielectric ball at zero and
finite temperature are presented. Summation over the angular momentum values is
accomplished in a closed form by making use of the addition theorem for the
relevant Bessel functions. The behavior of the thermodynamic characteristics in
the low and high temperature limits is investigated. The -term in the low
temperature expansion of the free energy is recovered (this term has been lost
in our previous calculations).Comment: 4 pages, LaTeX, no figures. Contribution to the Proceedings of the
Fifth Workshop on Quantum Field Theory under the Influence of External
Conditions, 10-14 Sept. 2001, Leipzig. Editor: M. Borda
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