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Abstract: Numerical simulations of the effect of a long-range scalar interaction LRSIacting only on nonbaryonic dark matter, with strength comparable to gravity,show patterns of disruption of satellites that can agree with what is seen inthe Milky Way. This includes the symmetric Sagittarius stellar stream. Theexception presented here to the Kesden and Kamionkowski demonstration that anLRSI tends to produce distinctly asymmetric streams follows if the LRSI isstrong enough to separate the stars from the dark matter before tidaldisruption of the stellar component, and if stars dominate the mass in theluminous part of the satellite. It requires that the Sgr galaxy now containslittle dark matter, which may be consistent with the Sgr stellar velocitydispersion, for in the simulation the dispersion at pericenter exceeds virial.We present other examples of simulations in which a strong LRSI producessatellites with large mass-to-light ratio, as in Draco, or free streams ofstars, which might be compared to -orphan- streams.



Author: J.A. Keselman, A. Nusser, P.J.E. Peebles

Source: https://arxiv.org/



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