We show here the existence of acoustic metamaterial, in which both the effective density and bulk modulus are simultaneously negative, in the true and strict sense of an effective medium. Our double-negative acoustic system is an acoustic analogue of Veselago's medium in electromagnetism, and shares many unique consequences, such as negative refractive index. The double negativity in acoustics ...

We discuss the linear gravitoelectromagnetic approach used to solve Einstein’s equations in weak-field and slow-motion approximation, which is a powerful tool explain, by analogy with electromagnetism, several gravitational effects solar system, where approximation holds true. In particular, we analogy, according can be written as Maxwell-like equations, focus on definition of fields non-statio...

We propose a new broadband search strategy for ultralight axion dark matter that interacts with electromagnetism. An oscillating field induces transitions between two quasi-degenerate resonant modes of superconducting cavity. In runs optimized high and low masses, this setup can probe unexplored parameter space axion-like particles covering fifteen orders magnitude in mass, including astrophysi...

This paper presents the use of the feasibility and dominance (FAD) rules in a electromagnetism-like mechanism (EM) for the constraints handling in constrained global optimization. The FAD rules are easily incorporated in the EM algorithm: when two points are compared at a time and a selection is required, and when the direction of individual forces between two points has to be decided. Numerica...