3,211 research outputs found
Ergodic solenoids and generalized currents
We introduce the concept of solenoid as an abstract laminated space. We do a
thorough study of solenoids, leading to the notion of ergodic and uniquely
ergodic solenoids. We define generalized currents associated with immersions of
oriented solenoids with a transversal measure into smooth manifolds,
generalizing Ruelle-Sullivan currents.Comment: 28 pages, 2 figures. Fully revised presentation of the paper.
Accepted in Revista Matematica Complutense. The final publication is
available at http://www.springerlink.co
Ergodic solenoidal homology: density of ergodic solenoids
A measured solenoid is a laminated space endowed with a tranversal measure
invariant by holonomy, as defined in arXiv:0910.2836. A measured solenoid
immersed in a smooth manifold produces a closed current (known as generalized
Ruelle-Sullivan current). Uniquely ergodic solenoids are those for which there
is a unique (up to scalars) transversal measure. By the results in
arXiv:0910.2913, for any smooth manifold, any real homology class is
represented by a uniquely ergodic solenoid. In this paper, we prove that the
currents associated to uniquely ergodic solenoids are dense in the space of
closed currents, therefore proving the abundance of such objects.Comment: 9 pages, 2 figure
Coupled-wave surface-impedance analysis of extraordinary transmission through single and stacked metallic screens
In this paper we present an efficient Coupled-wave surface-impedance method
for the analysis of extraordinary optical transmission (EOT) through single and
stacked realistic metallic screens under normal and oblique incidence,
including possible dielectric interlayers. The proposed theory is valid for the
complete frequency range where EOT has been reported, including microwaves and
optics. Electromagnetic simulations validate the results of the model, which
allows for a fast and accurate characterization of the analyzed structures
Some interesting Orthotrichum records from Venezuela
Orthotrichum subulatum Mitt. and Orthotrichum diaphanum Brid. var. diaphanum are reported from the Mérida Páramo, representing the first records of these two species in Venezuela. Additionally, new records of the recently described O. tenuicaule Lewinsky and O. spanotrichum Lewinsky are reported
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