Field-Theoretical Methods

Xin Jiang, Haitang Yang

A bstract We provide a field-theoretic method to calculate entanglement entropy of CFT in all dimensions. This method works for entangling surfaces of arbitrary shape. The formalism manifests a field-theoretic proof of the Ryu-Takayanagi formula.

James G. Glimm, Arthur M. Jaffe

Newton C. A. da Costa, Francisco Antônio Dória

Wei Xiao, He Wang, Xiangzhi Zhang +5 more

In this article, we propose an in situ method to calibrate the magnetic-field coil systems in optically-pumped magnetometers. The method is based on parametric resonance induced by nonresonant radio-frequency (RF) fields, and is especially suitable for microfabricated single-beam zero-field atomic magnetometers. We have experimentally and theoretically demonstrated this method with a single-beam spin-exchange-relaxation-free (SERF) magnetometer, and the experiment results are in line with theoretical expectations.

R. S. Mendes

Traditional field-theoretical methods to study extensive many-particle systems are generalized to discuss nonextensive situations. In particular, generalizations of Green functions, path integral, and Gaussian integration are performed in the context of nonextensive Tsallis statistical mechanics. These developments employ integral representations that connect the usual and the generalized cases.