Lorentz violation naturalness revisited

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.