Cosmology

Scientists at Brown University have proposed a topological explanation for why the cosmological constant remains small despite predictions from quantum field theory. The study connects quantum gravity to the quantum Hall effect. It was published recently in Physical Review Letters.

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A recent challenge to the existence of dark energy has been resolved, with astronomers confirming that the universe continues to expand at an accelerating rate. Researchers at the University of Southampton reexamined supernova data and found no flaws in the standard measurements.

A superluminous supernova nicknamed SN Winny, located 10 billion light-years away, appears in the sky five times due to gravitational lensing by two foreground galaxies. Researchers from the Technical University of Munich and other institutions have analyzed this rare event to measure the universe's expansion rate, known as the Hubble constant. The discovery could help resolve the ongoing Hubble tension between different measurement methods.

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Physicists have found evidence challenging the century-old assumption that the universe is uniform on large scales. Three new preprint papers propose tests and analyze data showing the standard FLRW model may be flawed. The results could help resolve major cosmological puzzles.