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Abstract: We report on the results from an ongoing program aimed at testing Newton-slaw of gravity in the low acceleration regime using globular clusters. It isshown that all clusters studied so far do behave like galaxies, that is, theirvelocity dispersion profile flattens out at large radii where the accelerationof gravity goes below 1e-8 cm-s-s, instead of following the expected Keplerianfall off. In galaxies this behavior is ascribed to the existence of a darkmatter halo. Globular clusters, however, do not contain dark matter, hence thisresult might indicate that our present understanding of gravity in the weakregime of accelerations is incomplete and somehow incorrect.



Author: Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi, Giovanni Carraro

Source: https://arxiv.org/







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