True or Fictitious Flattening? -MEM and the $θ$ Term-

Details True or Fictitious Flattening? -MEM and the $θ$ Term- True or Fictitious Flattening? -MEM and the $θ$ Term-

2005-06-30

arxiv.org/abs/hep-lat/0506032v1

Physics

High Energy Physics

High Energy Physics - Lattice

PTPTEX <ver. 0.88>, 17 pages with 9 figures

Scientific paper

We study the sign problem in lattice field theory with a $\theta$ term. We apply the maximum entropy method (MEM) to flattening phenomenon of the free energy density $f(\theta)$, which originates from the sign problem. In our previous paper, we applied the MEM by employing the Gaussian topological charge distribution $P(Q)$ as mock data. In the present paper, we consider models in which `true' flattening of $f(\theta)$ occurs. These may be regarded as good examples for studying whether the MEM could correctly detect non trivial phase structure.

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