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Scaling and universality in the Ohmic two-state system is investigated by exploiting the equivalence of this model to the anisotropic Kondo model. For the Ohmic two-state system, we find universal scaling functions for the specific heat C_ (T), static susceptibility _ (T), and spin relaxation function S_ (), depending on the reduced temperature T/ₑ (frequency /ₑ), with ₑ the renormalized tunneling frequency, and uniquely specified by the dissipation strength (0<<1). The scaling functions can be used to extract and ₑ in experimental realizations.
T. A. Costi (Mon,) studied this question.