MOND: observational evidence and open challenges

by Federico Lelli (INAF - Arcetri Astrophysical Observatory)

Wednesday 14 May 2025, 14:30 → 15:30 Europe/Rome

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Milgromian dynamics (MOND) is an alternative to non-baryonic cold dark matter, proposed by Moti Milgrom in 1983. MOND modifies the non-relativistic laws of gravity and/or inertia at low accelerations, below a new constant a0 of the order of 10^-10 m/s^2. In this talk, I will review both the successes and challenges that the MOND paradigm faces on the scales of galaxies, galaxy groups, and galaxy clusters. I will also briefly describe some examples of non-relativistic and relativistic Lagrangian MOND theories.