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

References in corpus (1)

• Mass functions in coupled Dark Energy models

Cited by in corpus (16)

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• Constraining Interactions in Cosmology's Dark Sector
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• Tidal Tails Test the Equivalence Principle in the Dark Sector
• Adiabatic instability in coupled dark energy-dark matter models
• Dark-Matter-Induced Weak Equivalence Principle Violation
• Galaxy Satellites and the Weak Equivalence Principle
• Connection between a possible fifth force and the direct detection of Dark Matter
• The Abnormally Weighting Energy Hypothesis: the Missing Link between Dark Matter and Dark Energy
• Dark Energy-Dark Matter Interaction from the Abell Cluster A586
• Dark Matter Astrophysics
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