3,615 research outputs found
Quantum Zeno and anti-Zeno effects in the Friedrichs model
We analyze the short-time behavior of the survival probability in the frame
of the Friedrichs model for different formfactors. We have shown that this
probability is not necessary analytic at the time origin. The time when the
quantum Zeno effect could be observed is found to be much smaller than usually
estimated. We have also studied the anti-Zeno era and have estimated its
duration.Comment: References added. Appendix B shortened. Discussions extende
The resonance spectrum of the cusp map in the space of analytic functions
We prove that the Frobenius--Perron operator of the cusp map
, (which is an approximation of the
Poincar\'e section of the Lorenz attractor) has no analytic eigenfunctions
corresponding to eigenvalues different from 0 and 1. We also prove that for any
the spectrum of in the Hardy space in the disk
\{z\in\C:|z-q|<1+q\} is the union of the segment and some finite or
countably infinite set of isolated eigenvalues of finite multiplicity.Comment: Submitted to JMP; The description of the spectrum in some Hardy
spaces is adde
Towards Evidence Based M-Health Application Design in Cancer Patient Healthy Lifestyle Interventions
Cancer is one of the most prevalent diseases in
Europe and the world. Significant correlations between dietary
habits and cancer incidence and mortality have been
confirmed by the literature. Physical activity habits are also
directly implicated in the incidence of cancer. Lifestyle
behaviour change may be benefited by using mobile technology
to deliver health behaviour interventions. M-Health offers a
promising cost-efficient approach to deliver en-masse
interventions. Smartphone apps with constructs such as
gamification and personalized have shown potential for
helping individuals lose weight and maintain healthy lifestyle
habits. However, evidence-based content and theory-based
strategies have not been incorporated by those apps
systematically yet. The aim of the current work is to put the
foundations for a methodologically rigorous exploration of
wellness/health intervention literature/app landscape towards
detailed design specifications for connected health m-apps. In
this context, both the overall work plan is described as well as
the details for the significant steps of application space and
literature space review. Both strategies for research and initial
outcomes of it are presented. The expected evidence based
design process for patient centered health and wellness
interventions is going to be the primary input in the
implementation process of upcoming patient centered
health/wellness m-health interventions.ENJECT COST-STSM-ECOST-STSM-TD1405-220216-07045
A new model for the structure of the DACs and SACs regions in the Oe and Be stellar atmospheres
In this paper we present a new mathematical model for the density regions
where a specific spectral line and its SACs/DACs are created in the Oe and Be
stellar atmospheres. In the calculations of final spectral line function we
consider that the main reasons of the line broadening are the rotation of the
density regions creating the spectral line and its DACs/SACs, as well as the
random motions of the ions. This line function is able to reproduce the
spectral feature and it enables us to calculate some important physical
parameters, such as the rotational, the radial and the random velocities, the
Full Width at Half Maximum, the Gaussian deviation, the optical depth, the
column density and the absorbed or emitted energy. Additionally, we can
calculate the percentage of the contribution of the rotational velocity and the
ions' random motions of the DACs/SACs regions to the line broadening. Finally,
we present two tests and three short applications of the proposed model.Comment: 9 pages, 5 figures, accepted for publication in PAS
Non-equilibrium phenomena in the QCD phase transition
Within the context of the linear \s-model for two flavours, we investigate
non-equilibrium phenomena that may occur during the QCD chiral phase transition
in heavy-ion collisions. We assume that the chiral symmetry breaking is
followed by a rapid quench so that the system falls out of thermal equilibrium.
We study the mechanism for the amplification of the pion field during the
oscillations of the \s-field towards and around its new minimum. We show that
the pion spectrum develops a characteristic pronounced peak at low momenta.Comment: 14 pages, 8 figures, RevTex
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