Frontiers in Physics (May 2020)

The Problem of Renormalization of Chiral Nuclear Forces

  • U. van Kolck,
  • U. van Kolck

DOI
https://doi.org/10.3389/fphy.2020.00079
Journal volume & issue
Vol. 8

Abstract

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Ever since quantum field theory was first applied to the derivation of nuclear forces in the mid-twentieth century, the renormalization of pion exchange with realistic couplings has presented a challenge. The implementation of effective field theories (EFTs) in the 1990s promised a solution to this problem but unexpected obstacles were encountered. The response of the nuclear community has been to focus on “chiral potentials” with regulators chosen to produce a good description of data. Meanwhile, a successful EFT without explicit pion exchange—Pionless EFT—has been formulated where renormalization is achieved order by order in a systematic expansion of low-energy nuclear observables. I describe how lessons from Pionless EFT are being applied to the construction of a properly renormalized Chiral EFT.

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