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Racionalidad ética: Una acción racional responsable
Fantoni,Josefina;
Cuadernos de la Facultad de Humanidades y Ciencias Sociales. Universidad Nacional de Jujuy , 2000,
Abstract: we mean by ethical rationality an intersubjective rationality that set the basis for human common actions responsibility. an ethical response from communicative action allow us to institutionalize interests concerning everyone who share an authentic human vocation. although this rationality is made evident through an argumentative speech -in which the interlocutor brings forward the reasons that support his/her action- it doesn't mean ethical discourse could refuse to listen some of the persons affected by it or limit their argumentative competency or exclude them from the argumentative process; this would be to reject the logic and the proper finality of argumentation because of subjective motives, that could not cope with the canon of intersubjectivity. ethical rationality suppose to recognize human being -interlocutor- as person and assume the institutionalization of responsible actions, not individuals nor strategics but actions that accept decision consecuencies, generalizable interests and a compromise with the affected.
Some comments on predatory behavior in the airline industry
Fernando Fantoni
Revista de Literatura dos Transportes , 2010,
Abstract: This paper presents a brief discussion about the types of strategical behaviour an incubent airline may take when threatened by an entrant in a specific market and if this behaviour can be classified as a "predator" and thus influencing the future decision making of new entrants in the market. This paper presents a review of Sung-Hwan Kim′s paper "Predatory reputation in US airline markets" (2008).[Paper in Portuguese]
Low temperature acoustic polaron localization
Riccardo Fantoni
Physics , 2012, DOI: 10.1016/j.physb.2012.12.032
Abstract: We calculate the properties of an acoustic polaron in three dimensions in thermal equilibrium at a given low temperature using the path integral Monte Carlo method. The specialized numerical method used is described in full details, thus complementing our previous paper [R. Fantoni, Phys. Rev. B {\bf 86}, 144304 (2012)], and it appears to be the first time it has been used in this context. Our results are in favor of the presence of a phase transition from a localized state to an extended state for the electron as the phonon-electron coupling constant decreases. The phase transition manifests itself with a jump discontinuity in the potential energy as a function of the coupling constant and it affects the properties of the path of the electron in imaginary time: In the weak coupling regime the electron is in an extended state whereas in the strong coupling regime it is found in a self-trapped state.
A cluster theory for a Janus fluid
Riccardo Fantoni
Physics , 2012, DOI: 10.1140/epjb/e2012-20820-1
Abstract: Recent Monte Carlo simulations on the Kern and Frenkel model of a Janus fluid have revealed that in the vapour phase there is the formation of preferred clusters made up of a well-defined number of particles: the micelles and the vesicles. A cluster theory is developed to approximate the exact clustering properties stemming from the simulations. It is shown that the theory is able to reproduce the micellisation phenomenon.
Low temperature acoustic polaron localization
Riccardo Fantoni
Physics , 2012, DOI: 10.1103/PhysRevB.86.144304
Abstract: We calculate the low temperature properties of an acoustic polaron in three dimensions in thermal equilibrium at a given temperature using a specialized path integral Monte Carlo method. In particular we find numerical evidence that the chosen Hamiltonian for the acoustic polaron describes a phase transition from a localized state to an unlocalized state for the electron as the phonons-electron coupling constant decreases. The phase transition manifests itself with a jump discontinuity in the potential energy as a function of the coupling constant. In the weak coupling regime the electron is in an extended state whereas in the strong coupling regime it is found in a self-trapped state.
Hellmann and Feynman theorem versus diffusion Monte Carlo experiment
Riccardo Fantoni
Physics , 2013, DOI: 10.1016/j.ssc.2013.01.028
Abstract: In a computer experiment the choice of suitable estimators to measure a physical quantity plays an important role. We propose a new direct route to determine estimators for observables which do not commute with the Hamiltonian. Our new route makes use of the Hellmann and Feynman theorem and in a diffusion Monte Carlo simulation it introduces a new bias to the measure due to the choice of the auxiliary function. This bias is independent from the usual one due to the choice of the trial wave function. We used our route to measure the radial distribution function of a spin one half Fermion fluid.
Gas-liquid coexistence for the bosons square-well fluid and the $\mbox{}^4$He binodal anomaly
Riccardo Fantoni
Physics , 2014, DOI: 10.1103/PhysRevE.90.020102
Abstract: The binodal of a boson square-well fluid is determined as a function of the particle mass through the newly devised quantum Gibbs ensemble Monte Carlo algorithm [R. Fantoni and S. Moroni, {\sl to be published}]. In the infinite mass limit we recover the classical result. As the particle mass decreases the gas-liquid critical point moves at lower temperatures. We explicitely study the case of a quantum delocalization de Boer parameter close to the one of $\mbox{}^4$He. For comparison we also determine the gas-liquid coexistence curve of $\mbox{}^4$He for which we are able to observe the binodal anomaly below the $\lambda$-transition temperature.
Radial distribution function in a diffusion Monte Carlo simulation of a Fermion fluid between the ideal gas and the Jellium model
Riccardo Fantoni
Physics , 2013, DOI: 10.1140/epjb/e2013-40204-3
Abstract: We study, through the diffusion Monte Carlo method, a spin one-half fermion fluid, in the three dimensional Euclidean space, at zero temperature. The point particles, immersed in a uniform "neutralizing" background, interact with a pair-potential which can be continuously changed from zero to the Coulomb potential depending on a parameter $\mu$. We determine the radial distribution functions of the system for various values of density, $\mu$, and polarization. We discuss about the importance, in a computer experiment, of the choice of suitable estimators to measure a physical quantity. The radial distribution function is determined through the usual histrogram estimator and through an estimator determined via the use of the Hellmann and Feynman theorem. In a diffusion Monte Carlo simulation the latter route introduces a new bias to the measure of the radial distribution function due to the choice of the auxiliary function. This bias is independent from the usual one due to the choice of the trial wave function. A brief account of the results from this study were presented in a recent communication [R. Fantoni, Solid State Communications, {\bf 159}, 106 (2013)].
Two phase coexistence for the hydrogen-helium mixture
Riccardo Fantoni
Physics , 2015, DOI: 10.1103/PhysRevE.92.012133
Abstract: We use our newly constructed quantum Gibbs ensemble Monte Carlo algorithm to perform computer experiments for the two phase coexistence of a hydrogen-helium mixture. Our results are in quantitative agreement with the experimental results of C. M. Sneed, W. B. Streett, R. E. Sonntag, and G. J. Van Wylen. The difference between our results and the experimental ones is in all cases less than 15% relative to the experiment, reducing to less than 5% in the low helium concentration phase. At the gravitational inversion between the vapor and the liquid phase, at low temperatures and high pressures, the quantum effects become relevant. At extremely low temperature and pressure the first component to show superfluidity is the helium in the vapor phase.
Two Component Plasma in a Flamm's Paraboloid
Riccardo Fantoni
Statistics , 2012, DOI: 10.1088/1742-5468/2012/04/P04015
Abstract: The two component plasma (TCP) living in a Flamm's paraboloid is studied at a value of the coupling constant $\Gamma=2$ for which an analytic expression for the grand canonical partition function is available. Two cases are considered, the plasma in the half surface with an insulating horizon and the plasma in the whole surface. The Green's function equation necessary to determine the $n$-particle truncated correlation functions is explicitly found. In both cases this proves too complicated to be solved analytically. So we present the method of solution reducing the problem to finding the two linearly independent solutions of a linear homogeneous second order ordinary differential equation with polynomial coefficients of high degrees. In the flat limit one recovers the solution for the structure of the TCP in a plane in the first case but the collapse of opposite charges at the horizon makes the structure of the plasma physically not well defined in the second case.
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