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We present an analysis of a variational coherent-squeezed state that has beendiscussed in the literature as a potential ground state for the spin-bosonmodel. We show that when the system-size scaling of the spin-bath coupling isincluded properly, all squeezing effects and non-universal physics vanish inthe thermodynamic limit. We also present finite-size corrections to therenormalisation of the spin's coherence, showing that squeezing effects arealso absent to leading order in the inverse bath-size.

Failure of the displaced-squeezed state for spin-boson models in the thermodynamic limit