Few-body physics in effective field theory

Details Few-body physics in effective field theory Few-body physics in effective field theory

2005-07-26

arxiv.org/abs/nucl-th/0507060v1

J.Phys. G31 (2005) S1253-S1261

Physics

Nuclear Physics

Nuclear Theory

10 pages, 5 figures, Proceedings of the INT Workshop on "Nuclear Forces and the Quantum Many-Body Problem", Oct. 2004

Scientific paper

10.1088/0954-3899/31/8/003

Effective Field Theory (EFT) provides a powerful framework that exploits a separation of scales in physical systems to perform systematically improvable, model-independent calculations. Particularly interesting are few-body systems with short-range interactions and large two-body scattering length. Such systems display remarkable universal features. In systems with more than two particles, a three-body force with limit cycle behavior is required for consistent renormalization already at leading order. We will review this EFT and some of its applications in the physics of cold atoms and nuclear physics. In particular, we will discuss the possibility of an infrared limit cycle in QCD. Recent extensions of the EFT approach to the four-body system and N-boson droplets in two spatial dimensions will also be addressed.

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