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arXiv · 1601.06700

Lorentz violation naturalness revisited

Alessio Belenchia·Andrea Gambassi·Stefano Liberati
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Abstract

We revisit here the naturalness problem of Lorentz invariance violations on a simple toy model of a scalar field coupled to a fermion field via a Yukawa interaction. We first review some well-known results concerning the low-energy percolation of Lorentz violation from high energies, presenting some details of the analysis not explicitly discussed in the literature and discussing some previously unnoticed subtleties. We then show how a separation between the scale of validity of the effective field theory and that one of Lorentz invariance violations can hinder this low-energy percolation. While such protection mechanism was previously considered in the literature, we provide here a simple illustration of how it works and of its general features. Finally, we consider a case in which dissipation is present, showing that the dissipative behaviour does not percolate generically to lower mass dimension operators albeit dispersion does. Moreover, we show that a scale separation can protect from unsuppressed low-energy percolation also in this case.

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Alessio Belenchia, Andrea Gambassi, Stefano Liberati. 2016-05-23. Lorentz violation naturalness revisited. https://doi.org/10.1007/jhep06(2016)049

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