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We suggest that galileon theories should have an additional self-coupling of the fields to the trace of their own energy-momentum tensor.
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2011
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2011
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2011
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2011
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For a recent review, C. de Rham, “Galileons in the Sky” arXiv:1204.5492 [astro-ph.CO]
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Also note that A 2 A_{2} follows from coupling ϕ \phi to the trace of the manifestly chargeless tensor ( ∂ μ ∂ ν − δ μ ν ∂ α ∂ α ) ϕ β ϕ β \left(\partial_{\mu}\partial_{\nu}-\delta_{\mu\nu}\partial_{\alpha}\partial_{\alpha}\right)\phi_{\beta}\phi_{\beta}
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For C < 0 C<0 , to see cancellation between the individually divergent galileon and trace interaction energies for small r r requires leading and next-to-leading terms in the expansion: ϕ ′ ∼ r → 0 − 2 λ κ r + κ C 4 λ 2 + O ( r ) \ \phi^{\prime}\underset{r\rightarrow 0}{\sim}\tfrac{-2\lambda}{\kappa r}+\tfrac{\kappa C}{4\lambda^{2}}+O\left(r\right)
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The multivalued behavior of any solution for C critical < C < 0 C_{\text{critical}}<C<0 makes the determination of the total energy ambiguous, at best, for these cases. This is an unresolved issue
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2012
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