Date: 11 months ago   Category: Science

The natural anti-gravitational engine is found


The group of physicists of Columbia University (USA) has assumed that quasiparticles phonons (quanta of sound waves) have negative weight. In the presence of external gravitational field they have to move from below up. Earlier was considered that phonons have no weight. It is reported in the pre-print published in arXiv.org repository. The phonon represents collective excitement of atoms of crystals or dense liquids. He can be described mathematically as a particle to which quantum-mechanical properties extend. Traditionally was considered that gravitational forces don't exert any impact on sound waves. However it has experimentally been shown that in the presence of gravitational field of Earth phonons in superfluid liquids don't extend along direct horizontal lines, and are bent up. Though results of an experiment can be explained, without resorting to a concept of negative weight, in new work physicists assume that phonons form own tiny gravitational field. It moves together with quasiparticles, and the last, thus, get negative weight. This phenomenon depends on density of the environment, pressure in her and the speed of distribution of sound waves therefore arises not only in superfluid liquids, but also in usual conditions. It is more than important news in Film of Day Telegram-channel. Subscribe!

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