physics-and-mathematics67.16 min read
Molecular vibrations act as a 'catapult' for ultrafast electron transfer in organic solar cells
20 days ago•Source: Live Science
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68.115 min•27 days ago
China produces pure hexagonal diamond and claims superior hardness over regular diamond
Chinese researchers created small, pure hexagonal diamond (lonsdaleite) samples and demonstrated that it is stiffer and harder than cubic diamond and more oxidation-resistant; the 1.5 mm samples were formed by compressing organized graphite at about 20 GPa for 10 hours and heating to roughly 1,300–1,900°C, with the work published in Nature, indicating a feasible bulk production method and potential industrial applications in drilling, cutting, and thermal management.
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Webb Telescope Maps Cosmos's Invisible Skeleton in Unprecedented Detail
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Dark matter–neutrino interaction hints at a cosmology breakthrough
Researchers report a 3-sigma hint that dark matter and neutrinos may interact, transferring momentum and potentially reducing the universe’s observed clumpiness. If confirmed, this could require updates to the lambda-CDM model and help address the S8 tension between early- and late-universe measurements. The finding combines Planck/ACT early-universe data with BAO and cosmic-shear observations and simulations, but it remains unproven and will hinge on forthcoming data from surveys like the Vera Rubin Observatory for confirmation. A confirmed interaction would constitute a fundamental breakthrough in cosmology and particle physics.
Sticky Space? New Idea Says the Vacuum Could Be a Viscous Fluid Shaping the Cosmos
A new arXiv preprint proposes space may have bulk viscosity, effectively making the vacuum a viscous medium with spatial phonons that could slow cosmic expansion and better align DESI observations with reality. If true, this viscous-space model would challenge the standard Lambda-CDM cosmology and the cosmological constant, potentially redefining our understanding of dark energy. However, the idea is unreviewed and data-driven, with questions about whether viscosity is fundamental or a measurement artifact; upcoming data from Euclid and further DESI analyses will be crucial to test this hypothesis.