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Physics

Testing Modified Gravity Theories with Galaxy Cluster Dynamics

Quick fact

Some modified gravity theories predict that galaxy clusters should show a specific mismatch between masses derived from X-ray gas and those from gravitational lensing, a mismatch that could be up to tens of percent—a signal that would not exist in standard General Relativity.

Why this is interesting

Imagine giant cosmic clumps of thousands of galaxies, each swarming around an invisible center. Could their swift motion be revealing a hidden force—or a breakdown of Einstein's famous theory?

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Testing Modified Gravity Theories with Galaxy Cluster Dynamics

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