Evidence for a New Force in the Dark Sector?

Details Evidence for a New Force in the Dark Sector? Evidence for a New Force in the Dark Sector?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3704f&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #37.04; Bulletin of the American Astronomical Society, V

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We study the kinematics of dark matter using the massive cluster of galaxies 1E0657-56. The velocity of the "bullet" subcluster has been measured by X-ray emission from the shock front, and the masses and separation of the main and sub-clusters have been measured by gravitational lensing. The velocity with gravity alone is calculated in a variety of models of the initial conditions, mass distribution and accretion history; it is much higher than expected, by at least 2.4 sigma. Following Hayashi and White analysis, the probability of so large a subcluster velocity in cosmological simulations with no new force is estimated to be 10-7. A long range force with strength about 0.4 0.8 times that of gravity would provide the needed additional acceleration.

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