Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/08/011
Keywords
modified gravity; dark energy theory
Funding
- German Science Foundation (DFG) under the Collaborative Research Centre [(SFB) 676]
- STFC
- STFC [ST/G000417/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G000417/1] Funding Source: researchfish
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A Galileon field is one which obeys a spacetime generalization of the non-relativistic Galilean invariance. Such a field may possess non-canonical kinetic terms, but ghost-free theories with a well-defined Cauchy problem exist, constructed using a finite number of relevant operators. The interactions of this scalar with matter are hidden by the Vainshtein effect, causing the Galileon to become weakly coupled near heavy sources. We revisit estimates of the fifth force mediated by a Galileon field, and show that the parameters of the model are less constrained by experiment that previously supposed.
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