Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session X04: 30 Years of Effective Field Theories in Few-Nucleon Physics—A Steven Weinberg CelebrationInvited Live Streamed
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Sponsoring Units: DNP GFB Chair: Harald Griesshammer, George Washington Univ Room: Salon 2 |
Tuesday, April 12, 2022 10:45AM - 11:21AM |
X04.00001: Weinberg and a New Nuclear Physics Invited Speaker: Ubirajara van Kolck Among Weinberg's many great contributions to physics, the paradigm of effective field theory (EFT) is the deepest. In the early 1990s, Weinberg applied it to nuclear physics, allowing us to overcome the renormalization problems that plagued pion theories since the 1950s. I will review the early developments in Chiral EFT, which underlie the nuclear potentials and currents that currently make the initio of popular ab initio many-body methods. I will also describe the challenges faced by the original approach, which led not only to a better understanding of the interplay between nonperturbative and perturbative physics in Chiral EFT, but also to the development of successful lower-energy theories, such as Pionless EFT and Halo/Cluster EFT. As a consequence, EFTs are now recognized as the framework to describe low-energy nuclear structure and reactions consistently with the underlying theory of the strong interactions, QCD. |
Tuesday, April 12, 2022 11:21AM - 11:57AM |
X04.00002: From Phenomenological to Chiral Interactions Invited Speaker: Ruprecht Machleidt By now, the nuclear force problem has been with us for some 80+ years. This history can be almost symmetrically divided into 40 years of phenomenology (including meson “theory”) and 40 years of attempts to relate the problem to the fundamental theory of strong interactions, QCD. Not surprisingly, the transition from one era to the other was long and painful and a great example for how research in theory is try and error. Based upon Weinberg’s proposal of 30 years ago, chiral effective field theory based interactions emerged, which I will contrast with traditional nuclear forces. |
Tuesday, April 12, 2022 11:57AM - 12:33PM |
X04.00003: Chiral EFT for Electro-Weak Processes and the Role of the Delta Invited Speaker: Maria Piarulli A major goal of nuclear theory is to explain the wealth of data and peculiarities exhibited by nuclear systems using a fully microscopic approach. In this approach, which we refer to as the basic model of nuclear theory, nucleons interact with each other via many-body (primarily two- and three-body) effective interactions, and with external electroweak probes via effective currents describing the coupling of these probes to individual nucleons and many-body clusters of them. These effective interactions and currents serve as the primary inputs to it ab-initio methods for solving the many-body Schr\"{o}dinger equation associated with the nuclear system under consideration. In this talk, I will discuss recent advances in Quantum Monte Carlo calculations of low-lying spectra and electroweak properties of light nuclei, as well as the equation of state for nucleonic matter. Calculations based on the chiral effective field theory approach will be emphasized. |
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