Towards verified numerical renormalization group calculations
Lehrstuhl für Theoretische Physik I, Physikalisches Institut, Am Hubland Universität Würzburg,
97074 Würzburg, Germany
Received in final form: 11 June 2018
Published online: 24 January 2019
Numerical approaches are an important tool to study strongly correlated quantum systems. However, their fragility with respect to rounding errors is not well studied and numerically verified enclosures of the results are not available. In this work, we apply interval arithmetic to the well established numerical renormalization group scheme. This extension enables us to provide a numerically verified NRG excitation spectrum.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature, 2019