6-12 March 2016
Costa da Caparica, Portugal
Europe/Lisbon timezone

Finite density QFT from a density-of-states perspective

9 Mar 2016, 17:00
Costa da Caparica, Portugal

Costa da Caparica, Portugal

Ever Caparica - Beach & Conference Hotel Av. General Humberto Delgado, 47 2829-506 Costa da Caparica Portugal


Kurt Langfeld (Plymouth University)


For more than three decades, finite density quantum field theories have evaded first principle Monte-Carlo simulations due to the notorious sign-problem. The recent years have seen some remarkable progress towards the understanding of cold and dense quantum matter. The density-of-states approach aims to calculate the probability distribution of the imaginary part of the action. The partition function then appears as a Fourier integral of this density, which is carried out (semi-)analytically. The LLR method [1] is a Wang-Landau type of approach. We established that it features an exponential error suppression [2], which allows us to reliably estimate the density-of-states over hundreds of orders of magnitude. I review the results for a Z3 spin theory at finite densities [3], which serves as proof that the LLR method amasses enough precision to solve a strong sign problem. I will also address new results for QCD at finite densities of heavy quarks. [1] Langfeld, Lucini and Rago, PRL 109 (2012) 111601, arXiv:1204.3243 [2] Langfeld, Lucini, Pellegrini and Rago, arXiv:1509.08391 [3] Langfeld, Lucini, PRD D90 (2014) 9, 094502, arXiv:1404.7187.

Primary author

Kurt Langfeld (Plymouth University)


Antonio Rago (University of Plymouth (GB)) Biagio Lucini (Swansea University) Nicolas Garron (Plymouth University) Roberto Pellegrini (University of Edinburgh)

Presentation Materials