Now showing items 1-8 of 8

  • Accuracy and Stability of Virtual Source Method for Numerical Simulations of Nonlinear Water Waves 

    Graham, DI; Al-Tameemi, O; Langfeld, K
    The virtual source method (VSM) developed by Langfeld et al., (2016) is based upon the integral equations derived by using Green’s identity with Laplace’s equation for the velocity potential. These authors presented ...
  • The density of states approach for the simulation of finite density quantum field theories 

    Langfeld, K; Lucini, B; Rago, A; Pellegrini, R; Bongiovanni, L (2015-03-02)
    Finite density quantum field theories have evaded first principle Monte-Carlo simulations due to the notorious sign-problem. The partition function of such theories appears as the Fourier transform of the generalised ...
  • Density of states in gauge theories 

    Langfeld, K; Lucini, B; Rago, A (2012-09-11)
    The density of states is calculated for a SU(2) and a compact U(1) lattice gauge theory using a modified version of the Wang-Landau algorithm. We find that the density of states of the SU(2) gauge theory can be reliably ...
  • Ice-limit of Coulomb gauge Yang-Mills theory 

    Heinzl, T; Ilderton, A; Langfeld, K; Lavelle, M; McMullan, D (2008-10-27)
    In this paper we describe gauge invariant multi-quark states generalising the path integral framework developed by Parrinello, Jona-Lasinio and Zwanziger to amend the Faddeev-Popov approach. This allows us to produce ...
  • Is the ground state of Yang-Mills theory Coulombic? 

    Heinzl, T; Ilderton, A; Langfeld, K; Lavelle, M; Lutz, W; McMullan, D (2008-06-06)
    We study trial states modelling the heavy quark-antiquark ground state in SU(2) Yang-Mills theory. A state describing the flux tube between quarks as a thin string of glue is found to be a poor description of the continuum ...
  • Probing the ground state in gauge theories 

    Heinzl, T; Ilderton, A; Langfeld, K; Lavelle, M; Lutz, W; McMullan, D (2007-09-21)
    We consider two very different models of the flux tube linking two heavy quarks: a string linking the matter fields and a Coulombic description of two separately gauge invariant charges. We compare how close they are to ...
  • Solution of the Gribov problem from gauge invariance 

    Langfeld, K; Heinzl, T; Ilderton, A; Lavelle, M; McMullan, D (2008-12-01)
    A new approach to gauge fixed Yang-Mills theory is derived using the Polyakov-Susskind projection techniques to build gauge invariant states. In our approach, in contrast to the Faddeev-Popov method, the Gribov problem ...
  • Virtual source method simulation of progressive water waves 

    Al-Tameemi, O; Graham, DI; Langfeld, K (2019-01-01)
    The virtual source method (VSM) has been developed to simulate water waves based upon the solution of Laplace’s equation for the velocity potential integral equations with full nonlinear surface conditions. The basis of ...

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