Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2017/05/024
Keywords
dark matter theory; galaxy dynamics; modified gravity; gravity
Funding
- I-CORE Program of the Planning and Budgeting Committee, THE ISRAEL SCIENCE FOUNDATION [1829/12, 203/09]
- Asher Space Research Institute
- Fondazione Angelo Della Riccia
- The Dark Universe [SFB-Transregio TRR33]
- Swiss National Science Foundation
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We develop the framework for testing Lorentz invariance in the dark matter sector using galactic dynamics. We consider a Lorentz violating (LV) vector field acting on the dark matter component of a satellite galaxy orbiting in a host halo. We introduce a numerical model for the dynamics of satellites in a galactic halo and for a galaxy in a rich cluster to explore observational consequences of such an LV field. The orbital motion of a satellite excites a time dependent LV force which greatly affects its internal dynamics. Our analysis points out key observational signatures which serve as probes of LV forces. These include modifications to the line of sight velocity dispersion, mass profiles and shapes of satellites. With future data and a more detailed modeling these signatures can be exploited to constrain a new region of the parameter space describing the LV in the dark matter sector.
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