A New Force in the Dark Sector?

Details A New Force in the Dark Sector? A New Force in the Dark Sector?

2006-10-10

arxiv.org/abs/astro-ph/0610298v2

Phys.Rev.Lett.98:171302,2007

Astronomy and Astrophysics

Astrophysics

4 pp -- updated to final version which will appear in March 30, 2007 Phys. Rev. Lett. Changes are minor, mainly additional ref

Scientific paper

10.1103/PhysRevLett.98.171302

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. The probability of so large a subcluster velocity in cosmological simulations is <~ 10^{-7}. A long range force with strength ~ 0.4 - 1.2 times that of gravity would provide the needed additional acceleration.

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