The renormalization group with the zero-sound diagram predicts the Kohn-Luttinger pairing gap exponent scales as -ℓ instead of the standard -ℓ^4.
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Renormalization-group approach to the Kohn-Luttinger superconductivity: Amplification of the pairing gap from $\ell^4$ to $\ell$
The renormalization group with the zero-sound diagram predicts the Kohn-Luttinger pairing gap exponent scales as -ℓ instead of the standard -ℓ^4.