Acoustic torsion recently introduced in the literature (Garcia de Andrade,PRD(2004),7,64004) is extended to rotational incompressible viscous fluids represented by the generalised Navier-Stokes equation. The fluid background is compared with the Riemann-Cartan massless scalar wave equation, allowing for the generalization of Unruh acoustic metric in the form of acoustic torsion, expressed in te...

Wild rodents learn the danger-predicting meaning of predator bird calls through the paring of cues which are an aversive stimulus (immediate danger signal or unconditioned stimulus, US) and the acoustic stimulus (predator signal or conditioned stimulus, CS). This learning is a form of pavlovian conditioning. In analogy, in this article a setup is described where adaptive sensor-driven neural co...

Acoustic black holes are very interesting non-gravitational objects which can be described by the geometrical formalism of General Relativity. These models can be useful to experimentally test effects otherwise undetectable, as for example the Hawking radiation. The back-reaction effects on the background quantities induced by the analogue Hawking radiation could be the key to indirectly observ...

One version of the argument for design relies on the assumption that the apparent fine-tuning of the universe for the existence of life requires an explanation. I argue that the assumption is false. Philosophers who argue for the assumption usually appeal to analogies, such as the one in which a person was to draw a particular straw among a very large number of straws in order not to be killed....

Acoustic propagation in a moving fluid provides a conceptually clean and powerful analogy for understanding black hole physics. As a teaching tool, the analogy is useful for introducing students to both General Relativity and fluid mechanics. As a research tool, the analogy helps clarify what aspects of the physics are kinematics and what aspects are dynamics. In particular, Hawking radiation i...

A non-Riemannian geometrical approach to the investigation of an acoustic black hole in irrotational mean flows, based on the Lighthill vortex sound theory is given. This additional example of analog gravity based on classical fluids is used to investigate the acoustic Lorentz violation. An example is given where the contortion vector is distributed along a ring inside the fluid which can be gr...

The design of the mathematical model of the respiratory system is described in the study. The model has been designed using an electro-acoustic analogy and geometrical dimensions of the morphological models of the respiratory system. The dependence of the geometrical dimension of the airways upon the total lung impedance is studied. Geometrical dimensions of adult respiratory system and neonate...

We present a theoretical framework for acoustic wave propagation in metasurface comprising hexagonal lattice of hard spherical inclusions embedded soft elastic medium. Each layer the direction sound is approximated as homogenized with effective geometric and material properties. To account multiple scattering effects resonant inclusions, an analogy between fluid dynamics creeping flows elastody...