Abstract
Since the Galileon has been introduced, they witnessed a plethora of investigations. They exhibit a broad and interesting phenomenology.
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Notes
- 1.
Stability conditions enforce superluminal propagation of radial fluctuations while subluminal propagation in the angular direction.
- 2.
The presence of the Cubic Galileon guaranties the presence of superluminal propagation at large distances from a point source.
- 3.
The presence of the Quartic Galileon guaranties the presence of superluminal propagation at large distances from an extended source.
- 4.
It easy to check that \(\mathrm{b}'\) is always positive.
- 5.
The presence of the Quartic Galileon guaranties the superluminal propagation at short distances from a point source.
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Heisenberg, L. (2015). Superluminal Propagation in Galileon Models. In: Theoretical and Observational Consistency of Massive Gravity. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-18935-2_4
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