WebNov 22, 2024 · The Cornell study adds that a phonon has a very small bit of mass. But because it has negative mass, when gravity acts on it, the phonon goes in the opposite … WebMar 1, 2024 · The new calculation indicates that for ordinary sound waves in most materials, the mass carried is equal to the sound wave energy multiplied by a factor that depends on …

Researchers suggest phonons may have mass and perhaps …

WebMar 11, 2024 · “Because their gravitational mass is negative, phonons fall upwards.” And the amount they would “fall” is equally small, varying depending on the medium the … WebOct 2, 2024 · The macro world as we know it is governed by Newton’s laws of motion and gravity – what goes up, must come down.. But a team of physicists from Columbia University have put forward a theoretical paper that turns this idea on its head. They say there might actually be particles with negative mass – which under gravity, move up, … open source physics textbooks

Hydrological gravity response detection using a gPhone below

Recent research has shown that phonons and rotons may have a non-negligible mass and be affected by gravity just as standard particles are. In particular, phonons are predicted to have a kind of negative mass and negative gravity. This can be explained by how phonons are known to travel faster in denser materials. … See more In physics, a phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter, specifically in solids and some liquids. A type of quasiparticle, a phonon is an excited state in … See more A phonon is the quantum mechanical description of an elementary vibrational motion in which a lattice of atoms or molecules uniformly oscillates at a single frequency. … See more Solids with more than one atom in the smallest unit cell exhibit two types of phonons: acoustic phonons and optical phonons. See more The thermodynamic properties of a solid are directly related to its phonon structure. The entire set of all possible phonons that are described by the … See more The equations in this section do not use axioms of quantum mechanics but instead use relations for which there exists a direct correspondence in classical mechanics. For example: a rigid regular, crystalline (not amorphous) … See more By analogy to photons and matter waves, phonons have been treated with wavevector k as though it has a momentum ħk; … See more The phonon Hamiltonian is given by $${\displaystyle {\mathcal {H}}={\tfrac {1}{2}}\sum _{\alpha }\left(p_{\alpha }^{2}+\omega _{\alpha }^{2}q_{\alpha }^{2}-\hbar \omega _{\alpha }\right)}$$ In terms of the creation and annihilation operators, … See more WebAug 17, 2024 · Our findings are valid for non-relativistic media as well, and could have intriguing experimental implications. They claim that phonons might have negative mass and also have negative gravity. Arxiv – The mass of sound It is usually said that sound waves do not transport mass. WebI calculated the Phonon frequencies at Gamma point to study the stability of my system by using Quntum Espresso . I got 3 negative (imaginary) acoustic mode having values (-0.0608 , -0.0437 , -0. ... open source pitch correction