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The Bose-Fermi Kondo model with a metallic bath density of states of fermions and an Ising-symmetric bosonic bath is believed to have the same critical properties as the spin-boson model because the fermionic bath can be bosonized by standard techniques, leading to a dissipative Ohmic bath in addition to the Ising-symmetric bath. If the latter has a sub-Ohmic density of states, it dominates the critical properties, which then are those of the sub-Ohmic spin-boson model. Results from NRG calculations (Ref.) are consistent with this expectation.
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The Bose-Fermi Kondo model with a metallic bath density of states of fermions and an Ising-symmetric bosonic bath is believed to have the same critical properties as the spin-boson model because the fermionic bath can be bosonized by standard techniques, leading to a dissipative Ohmic bath in addition to the Ising-symmetric bath. If the latter has a sub-Ohmic density of states, it dominates the critical properties, which then are those of the sub-Ohmic spin-boson model. Results from NRG calculations (Ref.) are consistent with this expectation.
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