933 research outputs found
Meson production in γγ interactions at DAΦNE
A data sample of 240 pb−1 collected at √s = 1 GeV with the KLOE detector at the DAΦNE φ-factory has been analyzed in order to study the e+e− → e+e− X reactions, X being the π0π0 or η states produced in the scattering of two
quasi-real photons
Multistable Pulse-like Solutions in a Parametrically Driven Ginzburg-Landau Equation
It is well known that pulse-like solutions of the cubic complex
Ginzburg-Landau equation are unstable but can be stabilised by the addition of
quintic terms. In this paper we explore an alternative mechanism where the role
of the stabilising agent is played by the parametric driver. Our analysis is
based on the numerical continuation of solutions in one of the parameters of
the Ginzburg-Landau equation (the diffusion coefficient ), starting from the
nonlinear Schr\"odinger limit (for which ). The continuation generates,
recursively, a sequence of coexisting stable solutions with increasing number
of humps. The sequence "converges" to a long pulse which can be interpreted as
a bound state of two fronts with opposite polarities.Comment: 13 pages, 6 figures; to appear in PR
Accuracy in mineral identification: image spectral and spatial resolutions and mineral spectral properties
Problems related to airborne hyperspectral image data are reviewed and the requirements for data analysis applied
to mineralogical (rocks and soils) interpretation are discussed. The variability of mineral spectral features, including
absorption position, shape and depth is considered and interpreted as due to chemical composition, grain size
effects and mineral association. It is also shown how this variability can be related to well defined geologic processes.
The influence of sensor noise and diffuse atmospheric radiance in classification accuracy is also analyzed
Photonic realization of the relativistic Kronig-Penney model and relativistic Tamm surface states
Photonic analogues of the relativistic Kronig-Penney model and of
relativistic surface Tamm states are proposed for light propagation in fibre
Bragg gratings (FBGs) with phase defects. A periodic sequence of phase slips in
the FBG realizes the relativistic Kronig-Penney model, the band structure of
which being mapped into the spectral response of the FBG. For the semi-infinite
FBG Tamm surface states can appear and can be visualized as narrow resonance
peaks in the transmission spectrum of the grating
Classical simulation of the Hubbard-Holstein dynamics with optical waveguide lattices
A classical analog simulator of the two-site Hubbard-Holstein model,
describing the dynamics of two correlated electrons coupled with local phonons,
is proposed based on light transport in engineered optical waveguide arrays.
Our photonic analog simulator enables to map the temporal dynamics of the
quantum system in Fock space into spatial propagation of classical light waves
in the evanescently-coupled waveguides of the array. In particular, in the
strong correlation regime the periodic temporal dynamics, related to the
excitation of Holstein polarons with equal energy spacing, can be visualized as
a periodic self-imaging phenomenon of the light beam along the waveguide array
and explained in terms of generalized Bloch oscillations of a single particle
in a semi-infinite inhomogeneous tight-binding lattice.Comment: 7 pages, 4 figure
Analysis technique for exceptional points in open quantum systems and QPT analogy for the appearance of irreversibility
We propose an analysis technique for the exceptional points (EPs) occurring
in the discrete spectrum of open quantum systems (OQS), using a semi-infinite
chain coupled to an endpoint impurity as a prototype. We outline our method to
locate the EPs in OQS, further obtaining an eigenvalue expansion in the
vicinity of the EPs that gives rise to characteristic exponents. We also report
the precise number of EPs occurring in an OQS with a continuum described by a
quadratic dispersion curve. In particular, the number of EPs occurring in a
bare discrete Hamiltonian of dimension is given by ; if this discrete Hamiltonian is then coupled to continuum
(or continua) to form an OQS, the interaction with the continuum generally
produces an enlarged discrete solution space that includes a greater number of
EPs, specifically , in which
is the number of (non-degenerate) continua to which the discrete sector is
attached. Finally, we offer a heuristic quantum phase transition analogy for
the emergence of the resonance (giving rise to irreversibility via exponential
decay) in which the decay width plays the role of the order parameter; the
associated critical exponent is then determined by the above eigenvalue
expansion.Comment: 16 pages, 7 figure
Impurity-induced stabilization of solitons in arrays of parametrically driven nonlinear oscillators
Chains of parametrically driven, damped pendula are known to support
soliton-like clusters of in-phase motion which become unstable and seed
spatiotemporal chaos for sufficiently large driving amplitudes. We show that
the pinning of the soliton on a "long" impurity (a longer pendulum) expands
dramatically its stability region whereas "short" defects simply repel solitons
producing effective partition of the chain. We also show that defects may
spontaneously nucleate solitons.Comment: 4 pages in RevTeX; 7 figures in ps forma
Two and three-dimensional oscillons in nonlinear Faraday resonance
We study 2D and 3D localised oscillating patterns in a simple model system
exhibiting nonlinear Faraday resonance. The corresponding amplitude equation is
shown to have exact soliton solutions which are found to be always unstable in
3D. On the contrary, the 2D solitons are shown to be stable in a certain
parameter range; hence the damping and parametric driving are capable of
suppressing the nonlinear blowup and dispersive decay of solitons in two
dimensions. The negative feedback loop occurs via the enslaving of the
soliton's phase, coupled to the driver, to its amplitude and width.Comment: 4 pages; 1 figur
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