Can quarks always be confined by a linear potential?H. B. Ai &J. P. Hsu -1985 -Foundations of Physics 15 (2):155-159.detailsIt is demonstrated on the basis of the Dirac equation that quarks cannot be confined by a vector gluon potential of the form(r/r 0)a or[ln(r/r 0]a, a>0, if the quark-gluon interaction conserves parity. In order to confine quarks with the parity-conserving interaction, the effective gluon potential must be a pseudovector or a scalar. These are shown in a simpleYang-Mills field with theSU(2) group.
sQFT: An Autonomous Explanation of the Interactions of Quantum Particles.K. -H. Rehren,L. T. Cardoso,C. Gass,J. M. Gracia-Bondía,B. Schroer &J. C. Várilly -2024 -Foundations of Physics 54 (4):1-25.detailsSuccessful applications of a conceptually novel setup of Quantum Field Theory, that accounts for all subtheories of the Standard Model (QED, Electroweak Interaction and Higgs,Yang–Mills and QCD) and beyond (Helicity 2), call for a perspective view in a broader conceptual context. The setting is “autonomous” in the sense of being intrinsically quantum. Its principles are: Hilbert space, Poincaré symmetry and causality. Its free quantum fields are obtained from Wigner’s unitary representations of the Poincaré group, with only physical and (...) observable degrees of freedom. A “quantization” of an “underlying” classical theory is not needed. It allows renormalizable perturbation theory with interactions whose detailed structure, and in some cases even the particle content, is predicted by internal consistency. The results confirm and extend observable predictions for the interactions of the Standard Model without assuming a “principle” of gauge invariance. (shrink)
Periplus Maris Erythraei, Remarks on Chapter 47.J. A. B. Palmer -1949 -Classical Quarterly 43 (1-2):61-.detailsChapter 47 contains a sentence which has been the subject of a good deal of controversy and is manifestly corrupt. In the codex it reads as follows: κα τοᾁτων πνω μαιμᾃτατον θνος Bακτριανν π βασιλα οσαν διον τπον κα 'Aλξανδρος ρμηθες π τν μερν τοᾁτων ρι τοȗ Γγγον διλθε κτλ. Attempts have been made to connect this sentence with the rulers of the Kushan dynasty. It has even been suggested that οσαν represents Kονσαν : the suggestion naturally won no acceptance, (...) but one may point out that in any case it failed to attack the real difficulty, which lies in the words διον τπον On that essential point, the views of recent editors have both varied and combined. (shrink)
Computer-Assisted Decision Making in Medicine.J. C. Kunz,E. H. Shortliffe,B. G. Buchanan &E. A. Feigenbaum -1984 -Journal of Medicine and Philosophy 9 (2):135-160.detailsThis article reviews the strengths and limitations of five major paradigms of medical computer-assisted decision making (CADM): (1) clinical algorithms, (2) statistical analysis of collections of patient data, (3) mathematical models of physical processes, (4) decision analysis, and (5) symbolic reasoning or artificial intelligence (Al). No one technique is best for all applications, and there is recent promising work which combines two or more established techniques. We emphasize both the inherent power of symbolic reasoning and the promise of artificial intelligence (...) and the other techniques to complement each other. (shrink)
TheVirgo Callida of Plautus,Persa.J. C. B. Lowe -1989 -Classical Quarterly 39 (02):390-.detailsThat the theme of trickery and deception plays an important part in the comedies of Plautus is obvious. Although by no means absent from the comedies of Menander and Terence, it is not nearly so prominent in them as in Plautus. One reason for this difference may be Plautus' choice of Greek models, but there are good grounds for believing that changes made by Plautus to his models also served to emphasize the theme. E. Fraenkel showed that Plautus elevated the (...) scheming slave into a comic hero in a manner alien to Menander and Terence. He identified as an important factor in this heroization of the slave certain features of style, notably the recurring use of military metaphors which equate the slave with a victorious general. He also showed that Plautus probably greatly expanded certain slave roles, this expansion being most evident in elaborate polymetric monodies such as Chrysalus' Troy canticum, Bacch. 925ff. These stylistic effects and the increased bulk of the roles give greater emphasis to the Plautine scheming slave and ipso facto to the element of intrigue in the plot. The omissions which naturally went together with Plautus' insertions could also distort the emphasis of the Greek play in favour of the element of intrigue; a probable example is the Casina, in which it is generally agreed that Plautus cut the original anagnorisis ending. Recent writers have stressed another aspect of Plautus' style which helps to give a particular prominence to the theme of intrigue in his plays, his liking for metatheatrical effects, which remind the spectators that they are watching a stage performance not real life; these effects are pervasive but particularly cluster around scenes of deception, emphasizing that the deception is in a special sense a performance, a play within a play. (shrink)