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Tests of Modified Gravity with Dwarf Galaxies · Around

2011

Tests of Modified Gravity with Dwarf Galaxies

Jain, Bhuvnesh, Vanderplas, Jake

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In modified gravity theories that seek to explain cosmic acceleration, dwarf galaxies in low density environments can be subject to enhanced forces.

The class of scalar-tensor theories, which includes f(R) gravity, predict such a force enhancement (massive galaxies like the Milky Way can evade it through a screening mechanism that protects the interior of the galaxy from this "fifth" force).
We study observable deviations from GR in the disks of late-type dwarf galaxies moving under gravity.
The fifth-force acts on the dark matter and HI gas disk, but not on the stellar disk owing to the self-screening of main sequence stars.

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