15 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
25 papers
Integrating upstream and downstream reciprocity stabilizes cooperator-defector coexistence in others-only public goods games
Tatsuya Sasaki, Satoshi Uchida, Isamu Okada +2
Human cooperation persists among strangers in large, well-mixed populations despite theoretical predictions of difficulties, leaving a fundamental evolutionary puzzle. While upstre…
Relation between the escort average in microcanonical ensemble and the escort average in canonical ensemble in the Tsallis statistics
Masamichi Ishihara
We studied the escort averages in microcanonical and canonical ensembles in the Tsallis statistics of entropic parameter . The quantity is the measure of the deviation…
The evolution of cooperation and diversity by integrated indirect reciprocity
Tatsuya Sasaki, Satoshi Uchida, Isamu Okada +1
Indirect reciprocity is one of the major mechanisms for the evolution of cooperation in human societies. There are two types of indirect reciprocity: upstream and downstream. Coope…
Thermodynamic quantities of independent harmonic oscillators in microcanonical and canonical ensembles in the Tsallis statistics
Masamichi Ishihara
We study the energy and entropies for independent harmonic oscillators in the microcanonical and the canonical ensembles in the Tsallis classical and the Tsallis quantum statis…
Thermodynamics of the independent harmonic oscillators with different frequencies in the Tsallis statistics
Masamichi Ishihara
We study the thermodynamic quantities in the system of the independent harmonic oscillators with different frequencies in the Tsallis statistics of the entropic parameter (…
Thermodynamic relations and fluctuations in the Tsallis statistics
Masamichi Ishihara
The thermodynamic relations in the Tsallis statistics were studied with physical quantities. An additive entropic variable related to the Tsallis entropy was introduced by assuming…
Derivation of the density operator with quantum analysis for the generalized Gibbs ensemble in quantum statistics
Masamichi Ishihara
We derived the equation of the density operator for generalized entropy and generalized expectation value with quantum analysis when conserved quantities exist. The derived equatio…
Chiral phase transition in the linear sigma model within Hartree factorization in the Tsallis nonextensive statistics
Masamichi Ishihara
We studied chiral phase transition in the linear sigma model within the Tsallis nonextensive statistics in the case of small deviation from the Boltzmann-Gibbs (BG) statistics. The…
Derivation of density operators for generalized entropies with quantum analysis
Masamichi Ishihara
We gave a simple derivation of density operator with the quantum analysis. We dealt with the functional of a density operator, and applied maximum entropy principle. We obtained ea…
Chiral phase transition within the linear sigma model in the Tsallis nonextensive statistics based on density operator
Masamichi Ishihara
We studied the chiral phase transition for small within the Tsallis nonextensive statistics of the entropic parameter , where the quantity is the measure of the…
Momentum distribution and correlation for a free scalar field in the Tsallis nonextensive statistics based on density operator
Masamichi Ishihara
We derived the expression of the normalized -expectation value based on the density operator to the order with the physical temperature in the Tsallis nonextensive statist…
Phase transition for the system of small volume in the theory in the Tsallis nonextensive statistics
Masamichi Ishihara
We studied the effects of the nonextensivity on the phase transition for the system of small volume in the theory in the Tsallis nonextensive statistics of entropic param…
Transverse momentum fluctuation under the Tsallis distribution at high energies
Masamichi Ishihara
We studied the effects of the Tsallis distribution on the transverse momentum fluctuation in high energy collisions. The parton-hadron duality and the Bose-Einstein type correlatio…
Momentum Distribution and Correlation due to mass difference caused by power-like distribution
Masamichi Ishihara
The momentum distribution and particle correlation due to the mass difference were studied both in the case of the conventional expectation value and in the case of -expectation…
Event-by-event mean fluctuations and transverse size of color flux tube generated in - collisions at =0.90TeV
Takeshi Osada, Masamichi Ishihara
We propose a novel phenomenological model of mean transverse momentum fluctuations based on the Geometrical Scaling hypothesis. Bose-Einstein correlations between two gluons genera…
Chiral phase transitions in the linear sigma model in the Tsallis nonextensive statistics
Masamichi Ishihara
We studied chiral phase transitions in the Tsallis nonextensive statistics which has two parameters, the temperature and entropic parameter . The linear sigma model was used…
Effects of Tsallis distribution on parametric resonance in chiral phase transitions
Masamichi Ishihara
The parametric resonance was studied in chiral phase transitions when the momentum distribution is described by a Tsallis distribution. A Tsallis distribution has two parameters, t…
Effects of the Tsallis distribution in the linear sigma model
Masamichi Ishihara
The effects of the Tsallis distribution which has two parameters, and ,on physical quantities are studied using the linear sigma model in chiral phase transitions. The Tsall…
Application of optimization method to the model in the Tsallis nonextensive statistics
Masamichi Ishihara
We study the effects of the environment described by the Tsallis nonextensive statistics on physical quantities using an optimization method in the case of small deviation from the…
Description of a domain by a squeezed state in a scalar field theory
Masamichi Ishihara
The author attempted to describe a domain by using a squeezed state in quantum field theory. An extended squeeze operator was used to construct the state. In a scalar field theory,…
Environmental effects on the model in Tsallis statistics
Masamichi Ishihara
The author studied the effects of the environment described by Tsallis statistics in quantum mechanics, when the deviation from Boltzmann-Gibbs (BG) statistics is small. The $x^{4}…
Suppression of growth by multiplicative white noise in a parametric resonant system
Masamichi Ishihara
The author studied the growth of the amplitude in a Mathieu-like equation with multiplicative white noise. The approximate value of the exponent at the extremum on parametric reson…
Amplification induced by white noise
Masamichi Ishihara
We investigate the amplification of the field induced by white noise. In the present study, we study a stochastic equation which has two parameters, the energy of a fr…
Effects of white noise on parametric resonance in theory
Masamichi Ishihara
We investigate the effects of white noise on parametric resonance in theory. The potential in this study is . An M…