Abstract
We derive low-energy effective action for a short coherent conductor between normal (N) and superconducting (S) reservoirs. We evaluate interaction correction $\ensuremath{\delta}G$ to Andreev conductance and demonstrate a close relation between Coulomb effects and shot noise in NS systems. In the diffusive limit doubling of both shot-noise power and charge in the carriers yields $|\ensuremath{\delta}G|$ four times larger than in the normal case. Our predictions can be directly tested in future experiments.
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