physics-and-mathematics67.72 min read
Dark voids sprint past light in lab—without breaking relativity
1 month ago•Source: Live Science
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67.16 min•2 months ago
Molecular vibrations act as a 'catapult' for ultrafast electron transfer in organic solar cells
Researchers show ultrafast charge transfer at a donor–acceptor junction in an organic solar cell, where vibrations of the donor polymer launch an electron across the junction in about 18 femtoseconds. This vibronic mechanism acts like a molecular catapult, enabling faster, more coherent charge transfer than thought possible and suggesting new design strategies that exploit, rather than suppress, molecular motion to improve organic solar cell efficiency.
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Lab recreates the Big Bang’s first millisecond, revealing a soupy primordial plasma
Live Science•3 months ago
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Webb Telescope Maps Cosmos's Invisible Skeleton in Unprecedented Detail
Live Science•3 months ago
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Macroscopic quantum state realized with 7,000-atom sodium nanoparticles
Physicists demonstrated a macroscopic quantum superposition by sending a beam of 7,000-atom sodium nanoparticles through a narrow slit, which produced an interference pattern and set a new record for the size of objects observed in quantum states; the result points toward future experiments with larger, even biological, molecules in quantum superpositions.
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.