Evidence for a conformal phase in SU(N) gauge theories

We discuss the existence of a conformal phase in SU(N) gauge theories in four dimensions. In this lattice study we explore the model in the bare parameter space, varying the lattice coupling and bare mass. Simulations are carried out with three colors and twelve flavors of dynamical staggered fermions in the fundamental representation. The analysis of the chiral order parameter and the mass spectrum of the theory indicates the restoration of chiral symmetry at zero temperature and the presence of a Coulomb-like phase, depicting a scenario compatible with the existence of an infrared stable fixed point at nonzero coupling. Our analysis supports the conclusion that the onset of the conformal window for QCD-like theories is smaller than Nf=12, before the loss of asymptotic freedom at sixteen and a half flavors. We discuss open questions and future directions.Comment: 11 pages, 11 figures; extended analysis, conclusions unchanged. (version to appear in PRD

The Next Great Copyright Act

Thorvald Solberg was the first and longest serving Register of Copyrights. He seems inspired in his portrait, and for good reason. Solberg was a visionary leader, a champion of authors’ rights, and an early advocate for the United States’ adherence to the Berne Convention for the Protection of Literary and Artistic Works (“Berne Convention”). Under his care, the Copyright Office grew from a handful of employees to more than one hundred professional staff and took on the many roles that are still critical to the mission of the Office today. Solberg and his team administered the copyright registration system, managed the public records of copyright information, facilitated the delivery of books and other copyright deposits to the Library of Congress (the “Library”), served as substantive experts within the U.S. government, provided policy advice to Congress, and represented the United States at international meetings. He was Register during the revision process that led to the 1909 Act, in which copyright term was extended to a total period of fifty-six years subject to renewal registration, but he broached the subject of automatic protection as early as the 1920s

From Monkey Selfies to Open Source: The Essential Interplay of Creative Culture, Technology, Copyright Office Practice, and the Law

The 2016 Distinguished Roger L. Shidler Lecture was delivered on July 22, 2016 at the University of Washington School of Law, Center for Advanced Study & Research on Innovation Policy during the 2016 Global Innovation Law Summit

The role of final state interactions in epsilon'/epsilon

The Standard Model prediction for epsilon'/epsilon is updated, taking into account the chiral loop corrections induced by final state interactions. The resulting value, epsilon'/epsilon = (17\pm 6)\times 10^{-4}, is in good agreement with present measurements.Comment: 3 pages. Invited talk at the 2000 Meeting of the Division of Particles and Fields of the American Physical Society --DPF2000-- (Columbus, Ohio, August 2000

The Standard Model prediction for eps'/eps

We review fundamental aspects of a new Standard Model analysis of eps'/eps which takes into account the strong enhancement induced by final state interactions.Comment: 3 pages, LaTex, uses ws-p10x7.cls. Talk given by E.P. at ICHEP2000, Osaka, July 27-August 2, 200

epsilon'/eps in the Standard Model

We overview the detailed analysis of epsilon'/epsilon within the Standard Model, presented in ref. 1. When all sources of large logarithms are considered, both at short and long distances, it is possible to perform a reliable Standard Model estimate of epsilon'/epsilon. The strong S-wave rescattering of the final pions has an important impact on this observable. The Standard Model prediction is found to be Re(epsilon'/epsilon) =(1.7 +- 0.9)*10^{-3}, in good agreement with the most recent experimental measurements. A better estimate of the strange quark mass would reduce the uncertainty to about 30%.Comment: Talk presented at the International Europhysics Conference on High Energy Physics, July 12-18, 2001,Budapest, Hungar

Chiral symmetry of QCD with twelve light flavors

We study QCD with twelve light flavors at intermediate values of the bare lattice coupling. We contrast the results for the order parameter with different theoretical models motivated by the physics of the Goldstone phase and of the symmetric phase, and we perform a model independent analysis of the meson spectrum inspired by universal properties of chiral symmetry. Our analysis favors chiral symmetry restoration.Comment: 7 pages, 3 figures. To appear in the proceedings of the XXVIII International Symposium on Lattice Field Theory, Lattice2010, June 14-19, 2010, Villasimius, Ital