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A theoretical nuclear physicist working on effective field theory descriptions of nuclear forces. His review with Evgeny Epelbaum and Ulf-G. Meißner compares descriptions at different resolution scales. Selecting the relevant low-energy degrees of freedom permits controlled calculations of few-nucleon systems while retaining constraints from quantum chromodynamics.^[ref]

A theoretical nuclear physicist who studies nuclear forces using effective field theory. His joint review with Evgeny Epelbaum and Hans-Werner Hammer explains how the symmetries of quantum chromodynamics constrain low-energy interactions between nucleons. The approach organizes increasingly accurate calculations without treating a nucleus directly as a collection of interacting quarks.^[ref]