Galilean Equivalence for Galactic Dark Matter

Abstract

Satellite galaxies are tidally disrupted as they orbit the Milky Way. If dark matter (DM) experiences a stronger self-attraction than baryons, stars will preferentially gain rather than lose energy during tidal disruption leading to an enhancement in the trailing compared to the leading tidal stream. The Sgr dwarf galaxy is seen to have roughly equal streams, challenging models in which DM and baryons accelerate differently by more than 10%. Future observations and a better understanding of DM distribution should allow detection of equivalence violation at the percent level.

4 pages, 3 figures, final version published in PRL

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Cited by in corpus (80)

• Dark Matter and Dark Radiation
• Approaches to Understanding Cosmic Acceleration
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• Evading Equivalence Principle Violations, Cosmological and other Experimental Constraints in Scalar Field Theories with a Strong Coupling to Matter
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• Constraining Interactions in Cosmology's Dark Sector
• Signature of the interaction between dark energy and dark matter in galaxy clusters
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• N-Body Simulations for Coupled Scalar Field Cosmology
• Adiabatic instability in coupled dark energy-dark matter models
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• Coherent Self-Interactions of Dark Matter in the Bullet Cluster
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