arXiv subjects

Fortunato Tito Arecchi

Publications and source records attributed to Fortunato Tito Arecchi.

3 recordsLinked to original sources

arXiv2020

Quantum entanglement in the Synchronization of Homoclinic Chaotic Spike Sequences

Physics deals with Newtonian particles described by position q and momentum p. The precision of the simultaneous measurement of q and p is limited by the uncertainty relation ruled by Planck's constant. From the uncertainty relation all quantum consequences emerge, including entanglement. On the other hand, Homoclinic Chaos (HC) , that consists of sequences of identical pulses, unevenly spaced in time, entails a non-Newtonian description. Synchronization of finite HC spike sequences (SFSS) display quantum features ruled by a constant different from hbar, yielding entanglement. As a relevant example, we describe how brain neurons generate HC voltage pulses. SFSS is the way two different words coded as HC pulses compare their content and extract a meaningful sequence by exploiting quantum entanglement that lasts over a de-coherence time in the range of human linguistic processes.

q-bio.NC↗

arXiv2007

Spatiotemporal pulses in a liquid crystal optical oscillator

A nonlinear optical medium results by the collective orientation of liquid crystal molecules tightly coupled to a transparent photoconductive layer. We show that such a medium can give a large gain, thus, if inserted in a ring cavity, it results in an unidirectional optical oscillator. Dynamical regimes with many interacting modes are made possible by the wide transverse size and the high nonlinearity of the liquid crystals. We show the generation of spatiotemporal pulses, coming from the random superposition of many coexisting modes with different frequencies.

nlin.AO↗

arXiv2005

On a liquid drop "falling" inside a heavier miscible fluid

We report a new type of drop instability, where the density difference between the drop and the solvent is negative. We show that the drop falls inside the solvent down to a minimum height, then fragmentation takes place and secondary droplets rise up to the surface. We have developed a theoretical model that captures the essential of the phenomenon and predicts the correct scalings for the rise-up time and the minimum height.

nlin.CD↗