34 citations · 259 across the 30 of their papers we have counts for
32 papers
Density-Induced Hadron-Quark Crossover via the Formation of Cooper Triples
Hiroyuki Tajima, Shoichiro Tsutsui, Takahiro M. Doi +1
We discuss the hadron--quark crossover accompanied by the formation of Cooper triples (three-body counterpart of Cooper pairs) by analogy with the Bose--Einstein condensate to Bard…
Nuclear force with LapH smearing
Takuya Sugiura, Yutaro Akahoshi, Tatsumi Aoyama +2
The nuclear forces are determined by combining the HAL QCD method and a new type of source smearing technique. The new smearing is a projection to a space spanned by the lowest-lyi…
Three-body crossover from a Cooper triple to bound trimer state in three-component Fermi gases near a triatomic resonance
Hiroyuki Tajima, Shoichiro Tsutsui, Takahiro M. Doi +1
We theoretically investigate ground-state properties of a three-component Fermi gas with pairwise contact interactions between different components near a triatomic resonance where…
Unitary -wave Fermi gas in one dimension
Hiroyuki Tajima, Shoichiro Tsutsui, Takahiro M. Doi +1
We elucidate universal many-body properties of a one-dimensional, two-component ultracold Fermi gas near the -wave Feshbach resonance. The low-energy scattering in this system c…
Complex Langevin study for polarons in an attractively interacting one-dimensional two-component Fermi gas
Takahiro M. Doi, Hiroyuki Tajima, Shoichiro Tsutsui
We investigate a polaronic excitation in a one-dimensional spin-1/2 Fermi gas with contact attractive interactions, using the complex Langevin method, which is a promising approach…
Cooper Triples in Attractive Three-Component Fermions: Implication for Hadron-Quark Crossover
Hiroyuki Tajima, Shoichiro Tsutsui, Takahiro M. Doi +1
We investigate many-body properties of equally populated three-component fermions with attractive three-body contact interaction in one dimension. A diagrammatic approach suggests…
Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases
Hiroyuki Tajima, Shoichiro Tsutsui, Takahiro M. Doi
Pseudogap is a ubiquitous phenomenon in strongly correlated systems such as high- superconductors, ultracold atoms and nuclear physics. While pairing fluctuations induci…
Distribution of solutions of the fastest apparent convergence condition in optimized perturbation theory and its relation to anti-Stokes lines
Shoichiro Tsutsui, Takahiro M. Doi
We discuss fundamental properties of the fastest apparent convergence (FAC) condition which is used as a variational criterion in optimized perturbation theory (OPT). We examine an…
Dirac-mode analysis for quark number density and its application for deconfinement transition
Takahiro M. Doi, Kouji Kashiwa
The quark number density at finite imaginary chemical potential is investigated in the lattice QCD using the Dirac-mode expansion. We find the analytical formula of the quark numbe…
On a modification method of Lefschetz thimbles
Shoichiro Tsutsui, Takahiro M. Doi
The QCD at finite density is not well understood yet, where standard Monte Carlo simulation suffers from the sign problem. In order to overcome the sign problem, the method of Lefs…
Relating Quark Confinement and Chiral Symmetry Breaking in QCD
Hideo Suganuma, Takahiro M. Doi, Krzysztof Redlich +1
We study the relation between quark confinement and chiral symmetry breaking in QCD. Using lattice QCD formalism, we analytically express the various "confinement indicators", such…
Modifying partition functions: a way to solve the sign problem
Takahiro M. Doi, Shoichiro Tsutsui
A possible method to solve the sign problem is developed by modifying the original theory. Considering several modifications of the partition function, the observable in the origin…
Dirac-mode expansion of quark number density and its implications of the confinement-deconfinement transition
Takahiro M. Doi, Kouji Kashiwa
We investigate the quark number density at finite imaginary chemical potential by using the Dirac-mode expansion. In the large quark mass region, it is found that the quark number…
Some Relations for Quark Confinement and Chiral Symmetry Breaking in QCD
Hideo Suganuma, Takahiro M. Doi, Krzysztof Redlich +1
We analytically study the relation between quark confinement and spontaneous chiral-symmetry breaking in QCD. In terms of the Dirac eigenmodes, we derive some formulae for the Poly…
Interplay between Deconfinement and Chiral Properties
Hideo Suganuma, Takahiro M. Doi, Krzysztof Redlich +1
We study interplay between confinement/deconfinement and chiral properties. We derive some analytical relations of the Dirac modes with the confinement quantities, such as the Poly…
Dirac spectrum representation of Polyakov loop fluctuations in lattice QCD
Takahiro M. Doi, Krzysztof Redlich, Chihiro Sasaki +1
Dirac spectrum representations of the Polyakov loop fluctuations are derived on the temporally odd-number lattice, where the temporal length is odd with the periodic boundary condi…
An improvement in complex Langevin dynamics from a view point of Lefschetz thimbles
Shoichiro Tsutsui, Takahiro M. Doi
We develop a way of improving complex Langevin dynamics motivated by the Lefschetz-thimble decomposition of integrals. In our method, arbitrary observables of an original model wit…
Polyakov loop fluctuations in Dirac eigenmode expansion
Takahiro M. Doi, Krzysztof Redlich, Chihiro Sasaki +1
We investigate correlations of the Polyakov loop fluctuations with eigenmodes of the lattice Dirac operator. Their analytic relations are derived on the temporally odd-number size…
Lattice QCD analysis for relation between quark confinement and chiral symmetry breaking
Takahiro M. Doi, Hideo Suganuma, Takumi Iritani
The Polyakov loop and the Dirac modes are connected via a simple analytical relation on the temporally odd-number lattice, where the temporal lattice size is odd with the normal (n…
Relation between Confinement and Chiral Symmetry Breaking in Temporally Odd-number Lattice QCD
Takahiro M. Doi, Hideo Suganuma, Takumi Iritani
In the lattice QCD formalism, we investigate the relation between confinement and chiral symmetry breaking. A gauge-invariant analytical relation connecting the Polyakov loop and t…
Analytical Formulae of the Polyakov and the Wilson Loops with Dirac Eigenmodes in Lattice QCD
Hideo Suganuma, Takahiro M. Doi, Takumi Iritani
We derive an analytical gauge-invariant formula between the Polyakov loop and the Dirac eigenvalues in QCD, i.e., $L_P \propto \sum_n λ_n^{N_t -1} \langle n|\hat U_4|n…
Quark tensor and axial charges within the Schwinger-Dyson formalism
Nodoka Yamanaka, Takahiro M. Doi, Shotaro Imai +1
We calculate the tensor and axial charges of the quark in the Schwinger-Dyson formalism of Landau gauge QCD. It is found that the dressed tensor and isovector axial charges of the…
Lattice QCD study for relation between confinement and chiral symmetry breaking on temporally odd-number lattice
Takahiro M. Doi, Hideo Suganuma, Takumi Iritani
We investigate the contribution from each Dirac modes to the Polyakov loop based on a gauge-invariant analytical relation connecting the Polyakov loop and the Dirac modes on a temp…
Analytical Relation between Quark Confinement and Chiral Symmetry Breaking in QCD
Hideo Suganuma, Takahiro M. Doi, Takumi Iritani
We study the relation between quark confinement and spontaneous chiral-symmetry breaking directly in QCD. In lattice QCD formalism, we derive an analytical gauge-invariant relation…