Gravitational Lensing
Astronomers have used time-delay cosmography on gravitationally lensed quasars to measure the universe's expansion rate, finding a value that aligns with local observations but conflicts with early-universe estimates. This result, from a team including University of Tokyo researchers, bolsters the Hubble tension and suggests possible new physics at play. The study analyzed eight lens systems with data from advanced telescopes like the James Webb Space Telescope.
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Researchers have developed a quantum-inspired protocol to measure the masses of small cosmic objects that subtly bend light through microlensing. This approach leverages the quantum properties of photons to extract precise information from faint signals. It could detect elusive entities like rogue planets and isolated black holes without needing massive telescopes.