27 citations · 114 across the 23 of their papers we have counts for
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Analytic continuation of finite density QCD with heavy quarks in the strong coupling region
Shinji Ejiri, Hiroshi Yoneyama
Complex nature of finite density QCD with heavy quarks in the strong coupling region is studied. For this purpose, we consider the effective potential as a function of Polyakov lin…
First order transition regions in the quark masses and chemical potential parameter space of QCD
Shinji Ejiri, Norikazu Yamada, Hiroshi Yoneyama
We investigate the phase transitions of (2+Nf)-flavor QCD, where two light flavors and Nf massive flavors exist, aiming to understand the phase structure of (2+1)-flavor QCD. Perfo…
Complex singularities around the QCD critical point at finite densities
Shinji Ejiri, Yasuhiko Shinno, Hiroshi Yoneyama
Partition function zeros provide alternative approach to study phase structure of finite density QCD. The structure of the Lee-Yang edge singularities associated with the zeros in…
Singularities around the QCD critical point in the complex chemical potential plane
Shinji Ejiri, Yasuhiko Shinno, Hiroshi Yoneyama
We consider thermodynamic singularities appearing in the complex chemical potential plane in the vicinity of QCD critical point. In order to investigate what the singularities are…
Singularities of QCD in the complex chemical potential plane
Shinji Ejiri, Hiroshi Yoneyama
We study the thermodynamic singularities of QCD in the complex chemical potential plane by a numerical simulation of lattice QCD, and discuss a method to understand the nature of t…
Analytic Continuation in Two-color Finite Density QCD and Chiral Random Matrix Model
Yasuhiko Shinno, Hiroshi Yoneyama
Two-color finite density QCD is free from the sign problem, and it is thus regarded as a good model to check the validity of the analytic continuation method. We study the method i…
Sign problem and MEM in lattice field theory with the term
Masahiro Imachi, Yasuhiko Shinno, Hiroshi Yoneyama
Lattice field theory with the term suffers from the sign problem. The sign problem appears as flattening of the free energy. As an alternative to the conventional method, the F…
Sign problem and MEM
Masahiro Imachi, Yasuhiko Shinno, Hiroshi Yoneyama
The sign problem is notorious in Monte Carlo simulations of lattice QCD with the finite density, lattice field theory (LFT) with a term and quantum spin models. In this report,…
The -term, CP Model and the Inversion Approach in the Imaginary Method
Masahiro Imachi, Hitoshi Kambayashi, Yasuhiko Shinno +1
The weak coupling region of CP lattice field theory with the -term is investigated. Both the usual real theta method and the imaginary theta method are studied. The latt…
True or Fictitious Flattening? -MEM and the Term-
Masahiro Imachi, Yasuhiko Shinno, Hiroshi Yoneyama
We study the sign problem in lattice field theory with a term. We apply the maximum entropy method (MEM) to flattening phenomenon of the free energy density , which origi…
MEM study of true flattening of free energy and the term
Masahiro Imachi, Yasuhiko Shinno, Hiroshi Yoneyama
We study the sign problem in lattice field theory with a term, which reveals as flattening phenomenon of the free energy density . We report the result of the MEM analysi…
CP model with the theta term and maximum entropy method
Masahiro Imachi, Yasuhiko Shinno, Hiroshi Yoneyama
A term in lattice field theory causes the sign problem in Monte Carlo simulations. This problem can be circumvented by Fourier-transforming the topological charge distribution…
Application of Maximum Entropy Method to Lattice Field Theory with a Topological Term
M. Imachi, Y. Shinno, H. Yoneyama
In Monte Carlo simulation, lattice field theory with a term suffers from the sign problem. This problem can be circumvented by Fourier-transforming the topological charge distr…
Maximum Entropy Method Approach to Term
Masahiro Imachi, Yasuhiko Shinno, Hiroshi Yoneyama
In Monte Carlo simulations of lattice field theory with a term, one confronts the complex weight problem, or the sign problem. This is circumvented by performing the Fourier tr…
CP(N-1) Models with Theta Term and Fixed Point Action
R. Burkhalter, M. Imachi, Y. Shinno +1
The topological charge distribution P(Q) is calculated for lattice models. In order to suppress lattice cut-off effects we employ a fixed point (FP) action. Throug…
Two dimensional CP^2 Model with θ-term and Topological Charge Distributions
Masahiro Imachi, Shouhei Kanou, Hiroshi Yoneyama
Topological charge distributions in 2 dimensional CP^2 model with theta-term is calculated. In strong coupling regions, topological charge distribution is approximately given by Ga…
Phase structure of CP(N-1) model with topological term
M. Imachi, S. Kanou, H. Yoneyama
CP(N-1) model with topological term is numerically studied. The topological charge distribution P(Q) is calculated and then transformed to the partition function Z() as a functi…
Phase Structures of U(2) Gauge Theory with -Term in 2 dimensions
Masahiro Imachi, Takaaki Kakitsuka, Norimasa Tsuzuki +1
U(2) lattice gauge theory with -term in 2 space-time dimensions is investigated. It has non-Abelian real action and Abelian( U(1) type) imaginary action. The imaginary action is…
Topological Charge Distribution and Model with Term
A. S. Hassan, M, Imachi +4
The two dimensional model with term is simulated. We compute the topological charge distribution by employing the ``set method" and ``trial function method", whic…
Character Expansion, Zeros of Partition Function and -term in U(1) Gauge Theory
A. S. Hassan, M. Imachi, N. Tsuzuki +1
Character expansion developed in real space renormalization group (RSRG) approach is applied to U(1) lattice gauge theory with -term in 2 dimensions. Topological charge distribu…
Real Space Renormalization Group Analysis of U(1)-Gauge Theory with theta-term in 2 Dimensions
Ahmed Sayed HASSAN, Masahiro IMACHI, Hiroshi YONEYAMA
U(1) lattice gauge theory with -term is investigated by real space renormalization group approach. Flows of renormalized coupling constants are analyzed. For each , renormali…
Chiral perturbation theory, finite size effects and the three-dimensional model
S. Tominaga, H. Yoneyama
We study finite size effects of the d=3 model in terms of the chiral perturbation theory. We calculate by Monte Carlo simulations physical quantities which are, to order of $(…
Complex wave function, Chiral spin order parameter and Phase Problem
Masahiro IMACHI, Hiroshi YONEYAMA
We study the two dimensional Hubbard model by use of the ground state algorithm in the Monte Carlo simulation. We employ complex wave functions as trial function in order to have a…