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Updated: Jul 19, 2026

Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Galilean equivalence for galactic dark matter.

Michael Kesden¹, Marc Kamionkowski

¹Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON M5S 3H8, Canada.

Physical Review Letters

|October 10, 2006

Summary

Satellite galaxies orbiting the Milky Way show tidal disruption. If dark matter self-attracts more than baryons, trailing tidal streams will be enhanced, challenging current models.

Area of Science:

Astrophysics
Cosmology
Galaxy Formation and Evolution

Background:

Satellite galaxies undergo tidal disruption when orbiting larger galaxies like the Milky Way.
The distribution and self-interaction properties of dark matter (DM) influence this disruption process.
Baryonic matter and dark matter may experience differential acceleration during tidal stripping.

Purpose of the Study:

To investigate the impact of dark matter self-attraction on the tidal disruption of satellite galaxies.
To test models of dark matter-baryon interaction against observational data from the Sagittarius dwarf galaxy.
To determine the sensitivity of tidal stream morphology to variations in dark matter properties.

Main Methods:

Analysis of tidal stream morphology in satellite galaxies, specifically the Sagittarius dwarf galaxy.

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Comparison of observed leading and trailing tidal stream enhancements.

Modeling of stellar dynamics under different dark matter self-interaction scenarios.

Main Results:

The Sagittarius dwarf galaxy exhibits roughly equal leading and trailing tidal streams.
This observation challenges models predicting significant asymmetry due to differential dark matter-baryon acceleration (>10%).
Current models require refinement to reconcile dark matter self-attraction with observed stream properties.

Conclusions:

The self-attraction of dark matter may not significantly differ from that of baryons in satellite galaxies.
Future observations with enhanced sensitivity can probe dark matter distribution and self-interaction at the percent level.
Detecting violations of equivalence in dark matter-baryon acceleration could reveal new physics.