Articles you may be interested in Subwavelength waveguiding of surface phonons in pillars-based phononic crystal Superlensing effect for surface acoustic waves in a pillar-based phononic crystal with negative refractive index Appl. Simulations of acoustic waves bandgaps in a surface of silicon with a periodic hole structure in a thin nickel film Finite element analysis and experimental study of...

In the radial flow of gas into a black hole (i.e. Bondi accretion), the infall of any entropy or vorticity perturbation produces acoustic waves propagating outward. The dependence of this acoustic flux on the shape of the perturbation is investigated in detail. This is the key process in the mechanism of the entropic-acoustic instability proposed by Foglizzo& Tagger (2000) to explain the instab...

We assess the detectability of baryonic acoustic oscillations (BAO) in the power spectrum of galaxies using ultra large volume N-body simulations of the hierarchical clustering of dark matter and semi-analytical modelling of galaxy formation. A step-bystep illustration is given of the various effects (nonlinear fluctuation growth, peculiar motions, nonlinear and scale dependent bias) which syst...

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Abstract The effects of gravitational lensing the cosmic microwave background (CMB) have been measured at high significance with existing data and will be even more precisely in future surveys. Reversing on observed CMB temperature polarization maps provides a variety benefits. Delensed spectra sharper acoustic peaks prominent damping tails, allowing for improved inferences cosmological paramet...

Ultrasonic wedges which can propagate one longitudinal L and two orthogonally polarized shear S waves are presented. In order to use this wedge to generate and received guided plate acoustic waves along a metal plate at high temperatures brass which has a slow L and S wave velocities was chosen. Mode conversion method was used to convert L to S waves in the wedge. The mode conversion efficiency...

Relativistic electron-positron winds with strong magnetic fields are considered as a source of radiation for cosmological γ-ray bursters. Such a wind is generated by a millisecond pulsar with a very strong magnetic field. An electronpositron plasma near the pulsar is optically thick and in quasi-thermodynamic equilibrium. It is shown that the main part of radiation from the pulsar wind is nonth...