Mathematicians are raising a major challenge to one of modern cosmology's most widely accepted explanations: the idea that dark energy is driving the accelerating expansion of the universe.
A study published in Proceedings of the Royal Society A presents mathematical findings that researchers at the University of California, Davis, say reveal a fundamental instability in the standard model of the expanding universe. Their calculations suggest that cosmic acceleration could emerge naturally from Einstein's equations, potentially eliminating the need to invoke mysterious dark energy.
The work challenges the Lambda-cold dark matter model, the leading framework scientists use to describe the universe's evolution since the Big Bang. The researchers reached their conclusions by studying the Einstein-Euler equations, which combine Einstein's theory of general relativity with equations describing how fluids behave. Together, these mathematical tools help scientists investigate everything from galaxies and black holes to the expansion of the cosmos.
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