Now showing items 1-4 of 4

  • Computing general observables in lattice models with complex actions 

    Francesconi, O; Holzmann, M; Lucini, B; Rago, A; Rantaharju, J (2019-12-09)
    The study of QFTs at finite density is hindered by the presence of the so-called sign problem. The action definition of such systems is, in fact, complex-valued making standard importance sampling Monte Carlo methods ...
  • Density of state method for complex action systems 

    Francesconi, O; Holzmann, M; Lucini, B; Rago, A (2020-01-01)
    While importance sampling Monte Carlo algorithms have proved to be a crucial tool for numerical studies in modern physics, they fail when we consider complex action systems. The density of states approach provides a way ...
  • The density of states approach to the sign problem 

    Lucini, B; Francesconi, O; Holzmann, M; Rago, A (2019-01-22)
    Approaches to the sign problem based on the density of states have been recently revived by the introduction of the LLR algorithm, which allows us to compute the density of states itself with exponential error reduction. ...
  • Free energy of the self-interacting relativistic lattice Bose gas at finite density 

    Francesconi, O; Holzmann, M; Lucini, B; Rago, A (2019-10-24)
    The density of state approach has recently been proposed as a potential route to circumvent the sign problem in systems at finite density. In this study, using the Linear Logarithmic Relaxation (LLR) algorithm, we extract ...

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