Modèle à éviter, modèle à suivre, objet de comparaison

On peut diviser cent-cinquante ans de l’historiographie japonaise de la Révolution française en trois époque : l’ère Meiji (1868-1912), l’époque après la Seconde Guerre Mondiale (1945-1980) et l’époque après le bicentenaire de la Révolution. A la première époque, les Japonais cherchaient le modèle de la voie de la modernisation ; pour eux la Révolution était un modèle à éviter à cause de ses violences et ses désordres. Les historiens de la deuxième époque ont considéré que la survivance de la féodalité avait amené le Japon à la guerre et que la modernisation et la démocratisation étaient encore à faire ; la Révolution qui a complètement surmonté le féodalisme grâce à la Terreur était un modèle à suivre pour eux. La génération après le bicentenaire ne pense plus que le Japon soit plus retardé que la France mais que simplement les deux pays sont différents ; elle compare les histoires des deux pays mutuellement pour en trouver la similitude et la différence et pour mieux comprendre le caractère et l’originalité de chaque pays ; pour elle la Révolution est un objet de comparaison.The Japanese historiography of the French Revolution could be divided into three periods: the Meiji era (1868-1912), the post-World War Two period (1945-1980) and the period following the bicentenary of the Revolution. During the first period, the Japanese were looking for a path towards modernisation and they considered the Revolution as the model to avoid due to its violence and overall unrest. Historians from the second period viewed the fact that feudality had remained as the reason that brought Japan to war and considered that modernisation and democratisation were still yet to come. For them, the Revolution, having overthrown feudalism thanks to the Terror, had become the model to follow. The generation that came after the bicentenary does not think anymore that Japan is lagging behind France, but simply that the two countries are different. As such, those historians compare the histories of both countries to identify their similarities and differences, in order to better understand the nature and originality of each country. For them, the Revolution is a point of comparison

Exploring walking behavior in SU(3) gauge theory with 4 and 8 HISQ quarks

We present the report of the LatKMI collaboration on the lattice QCD simulation for the cases of 4 and 8 flavors. The Nf=8 in particular is interesting from the model-building point of view: The typical walking technicolor model with the large anomalous dimension is the so-called one-family model (Farhi-Susskind model). Thus we explore the walking behavior in LQCD with 8 HISQ quarks by comparing with the 4-flavor case (in which the chiral symmetry is spontaneously broken). We report preliminary results on the spectrum, analyzed through the chiral perturbation theory and the finite-size hyperscaling, and we discuss the availability of the Nf=8 QCD to the phenomenology.Comment: 7 pages, Proceedings of 30th International Symposium on Lattice Field Theory, June 24-29, 2012, Cairns, Australi

The scalar spectrum of many-flavour QCD

The LatKMI collaboration is studying systematically the dynamical properties of N_f = 4,8,12,16 SU(3) gauge theories using lattice simulations with (HISQ) staggered fermions. Exploring the spectrum of many-flavour QCD, and its scaling near the chiral limit, is mandatory in order to establish if one of these models realises the Walking Technicolor scenario. Although lattice technologies to study the mesonic spectrum are well developed, scalar flavour-singlet states still require extra effort to be determined. In addition, gluonic observables usually require large-statistic simulations and powerful noise-reduction techniques. In the following, we present useful spectroscopic methods to investigate scalar glueballs and scalar flavour-singlet mesons, together with the current status of the scalar spectrum in N_f = 12 QCD from the LatKMI collaboration.Comment: 9 pages, 5 figures, 1 table. To appear in the Proceedings of SCGT 12, KMI, Nagoya University, Dec. 4-7, 201