Showing papers by "Academy of Finland published in 1988"
TL;DR: In this paper, the polarisation tensor of gluons in high temperature QCD matter is discussed in the back-ground gauge and compared with that in the temporal axial A 0 = 0 gauge.
Abstract: The polarisation tensor of gluons in high temperature QCD matter is discussed in the back-ground gauge and compared with that in the temporal axialA
0=0 gauge. In both of these the gluon polarisation tensor alone is sufficient to give the asymptotically free sign of the QCD beta function. In the former the beta function and the imaginary part of the polarisation tensor are coupled in such a way that asymptotic freedom implies instability of plasma oscillations. In the latter, due to the non-covariance of the gauge condition, the beta function and the imaginary part are decoupled in such a way that the sign of the imaginary part corresponds to stable plasma oscillations.
33 citations
01 Jan 1988
TL;DR: The modal logic of as discussed by the authors is an extension of the two-valued predicate calculus which was developed in the late nineteenth century, and the roots of the modal theory reach far back to Aristotelian logic.
Abstract: Our contemporary modal logic is usually considered as an extension of the two-valued predicate calculus which was developed in the late nineteenth century. However, as is commonly known, the roots of our modal theory reach far back to Aristotelian logic, which regarded modal logic as a legitimate branch of logical studies. Interest in modal notions is a new phenomenon among logicians only when it is considered in the framework of the developments of those late nineteenth century logicians who are honoured as the pioneers of modern logic.
9 citations
01 Jan 1988
TL;DR: In a lecture on the philosophy of right, held just one year before the publication of the Grundlinien der Philosophie des Rechts in 18212, Hegel is reported as having said: "That which is reasonable becomes actual, and the actual becomes reasonable" as mentioned in this paper.
Abstract: “Reasonable and practical men refuse to be imposed upon by the possible, for the simple ground that it is possible only They stick to the actual (not meaning by that word merely whatever immediately is here and now)”1 This remark by Hegel in his Encyclopaedia is very revealing regarding the motives of his own modal theory Actuality and reason are interconnected, but the full concept of actuality is not to be mistaken for the immediately existing, eg the Prussian state An especially interesting statement by Hegel on this point was recently found in formerly unpublished lecture-notes taken in a lecture on the philosophy of right, held just one year before the publication of Hegel’s Grundlinien der Philosophie des Rechts in 18212 In these lecture-notes Hegel is reported as having said: “That which is reasonable becomes actual, and the actual becomes reasonable”3
6 citations