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- W3212930237 abstract "We discuss a new density of states (DoS) approach to solve the complex action problem that is caused by topological terms. The key ingredient is to use open boundary conditions for (at least) one of the directions, such that the quantization of the topological charge is lifted and the density becomes a regular function. We employ the DoS FFA method and compute the density of states as a function of the topological charge. Subsequent integration with suitable factors gives rise to the observables we are interested in. We here explore two test cases: U(1) lattice gauge theory in two dimensions, and SU(2) lattice gauge theory in four dimensions. Since the 2-d case has an exact solution we may use it to assess the method, in particular to establish the equivalence of the open boundary results with the usual choice of periodic boundary conditions. The SU(2) case is a first step of developing the techniques towards their eventual application in full QCD." @default.
- W3212930237 created "2021-11-22" @default.
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- W3212930237 date "2022-05-16" @default.
- W3212930237 modified "2023-09-26" @default.
- W3212930237 title "Density of states approach for lattice field theory with topological terms" @default.
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- W3212930237 doi "https://doi.org/10.22323/1.396.0158" @default.
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