Séminaire / Seminar GReCO |
| « Is there an alternative to dark matter? From large to small scales » |
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Benoit Famaey |
| Puzzling observations indicate that the baryonic surface density of galaxies plays a crucial role in setting the shape of their observed rotation curves, whilst it simultaneously plays no role in setting the tight relation between the baryonic mass and the asymptotic rotation velocity of these same galaxies. These particularly odd observations were predicted 40 years ago by Milgrom, who posited that they were due to the effect of a single universal force law resulting from a modification of Newtonian dynamics (MOND) at galactic scales. The repeated success of these predictions for galaxy kinematics over 40 years explains why this bold idea is still taken seriously today. I will illustrate these successes but also show how difficult it is to reconcile them with tight tests of gravity on small scales, and with the success of our current standard model of cosmology on large scales. |
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lundi 16 septembre 2024 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |