All articles tagged with #angular momentum
Earth’s rotation is slowing due to tidal interactions with the Moon, lengthening the day while the Moon slowly drifts outward at about 3.8 cm per year. The transfer conserves angular momentum, so nothing is stolen—past days were shorter, with a lengthy pause around 19 hours for roughly a billion years before the gradual increase resumed. The present rate and historical timeline vary with continental configurations and tidal dynamics.
Researchers used terahertz laser pulses to drive circular lattice vibrations in a crystal and tracked how angular momentum transfers between vibrational modes; during the transfer the rotation can flip direction due to the lattice’s rotational symmetry, offering a direct quantum signature of angular momentum conservation with potential implications for magnetism and ultrafast control of quantum materials.
An Oxford-led team identifies a giant, razor-thin cosmic filament about 140 million light-years away that is rotating with galaxies aligned to its spin, offering new insights into how galaxies acquire angular momentum and evolve. The finding, enabled by MeerKAT’s MIGHTEE survey and complemented by DESI and SDSS data, challenges existing models of galaxy formation within the cosmic web.
Researchers have experimentally confirmed that angular momentum is conserved when a single photon splits into a pair, validating a fundamental quantum principle and paving the way for advanced quantum states useful in computing and communication.
Researchers in Germany have successfully sent single electrons along structured chiral paths, achieving chirality in electron matter waves without angular momentum. This work, which parallels earlier research with photons, could have significant applications in electron microscopy and the study of magnetic materials. However, some scientists are skeptical about the claim of chirality without angular momentum and the lack of citation of previous related work.