High-Precision Differential Radial Velocities of C3PO Wide Binaries: A Test of Modified Newtonian Dynamics (MOND)

Researchers measured differential radial velocities of 100 wide binary stars using high-resolution spectra to test Modified Newtonian Dynamics (MOND). The study achieved precision of 8–15 m s−1 per pair, significantly better than Gaia DR3. The results show tension with the standard MOND acceleration scale ($a_0$), depending on the specific MOND formulation used.

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