Two studies using novel galaxy group motion analysis suggest our cosmic neighborhood expands more slowly than previously measured, potentially requiring less dark matter to explain galactic dynamics.
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Two new studies published in Nature Ecology & Evolution have measured the expansion rate of the universe in our immediate cosmic neighborhood using a novel method that analyzes the motion of nearby galaxy groups. The research indicates that the local universe is expanding more slowly than previously estimated, bringing measurements of nearby galaxies into closer agreement with observations of the early universe.
This finding addresses a long-standing tension in cosmology between local and distant measurements of cosmic expansion, known as the Hubble tension. The novel approach examines how galaxy groups move within their surrounding cosmic flow, providing a more precise measurement of expansion in our local region of space.
The studies suggest that the slower local expansion rate may require adjustments to current cosmological models. Significantly, the findings indicate that less dark matter may be needed to explain the dynamics of galaxies within these groups than previously assumed, potentially reshaping our understanding of cosmic structure formation.
These results could influence future cosmological research and our understanding of dark matter's role in galaxy formation. The measurements may help resolve discrepancies between different methods of calculating the universe's expansion rate, though further validation from independent studies will be necessary to confirm these findings.