Cosmological surveys aim to constrain the ‘gravitational slip’, a key signature of modified gravity — but an as-yet unknown force acting on dark matter could mimic the gravitational slip and invalidate the test. By additionally factoring in a measurement of gravitational redshift, future surveys could have the power to distinguish between these possibilities.
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References
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This is a summary of: Bonvin, C. & Pogosian, L. Modified Einstein versus modified Euler for dark matter. Nat. Astron. https://doi.org/10.1038/s41550-023-02003-y (2023).
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Can cosmology distinguish a dark force from a modification of gravity?. Nat Astron 7, 1023–1024 (2023). https://doi.org/10.1038/s41550-023-02026-5
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DOI: https://doi.org/10.1038/s41550-023-02026-5