Stephen A. Appleby, Eric V. Linder
Galileon gravity offers a robust theoretical alternative to general relativity with a cosmological constant for explaining cosmic acceleration, protected by a shift symmetry and having second order field equations. The predictions for the combination of cosmic expansion and growth history are distinct from \Lambda CDM, and we demonstrate that approaching \Lambda CDM in one causes deviations in the other. This tension allows us to severely disfavor the entire class of minimally coupled standard Galileon gravity through current observational constraints.
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http://arxiv.org/abs/1204.4314
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