Search results for "pond"
showing 10 items of 742 documents
Finite size spectrum of SU(N) principal chiral field from discrete Hirota dynamics
2016
Using recently proposed method of discrete Hirota dynamics for integrable (1+1)D quantum field theories on a finite space circle of length L, we derive and test numerically a finite system of nonlinear integral equations for the exact spectrum of energies of SU(N)xSU(N) principal chiral field model as functions of m L, where m is the mass scale. We propose a determinant solution of the underlying Y-system, or Hirota equation, in terms of determinants (Wronskians) of NxN matrices parameterized by N-1 functions of the spectral parameter, with the known analytical properties at finite L. Although the method works in principle for any state, the explicit equations are written for states in the …
Weak and strong coupling equilibration in nonabelian gauge theories
2015
We present a direct comparison studying equilibration through kinetic theory at weak coupling and through holography at strong coupling in the same set-up. The set-up starts with a homogeneous thermal state, which then smoothly transitions through an out-of-equilibrium phase to an expanding system undergoing boost-invariant flow. This first apples-to-apples comparison of equilibration provides a benchmark for similar equilibration processes in heavy-ion collisions, where the equilibration mechanism is still under debate. We find that results at weak and strong coupling can be smoothly connected by simple, empirical power-laws for the viscosity, equilibration time and entropy production of t…
Quantum deformation of the Poincare supergroup and kappa -deformed superspace
1994
The classical $r$-matrix for $N=1$ superPoincar{\'e} algebra, given by Lukierski, Nowicki and Sobczyk is used to describe the graded Poisson structure on the $N=1$ Poincar{\'e} supergroup. The standard correspondence principle between the even (odd) Poisson brackets and (anti)commutators leads to the consistent quantum deformation of the superPoincar{\'e} group with the deformation parameter $q$ described by fundamental mass parameter $\kappa \quad (\kappa^{-1}=\ln{q})$. The $\kappa$-deformation of $N=1$ superspace as dual to the $\kappa$-deformed supersymmetry algebra is discussed.
Properties of some conformal field theories with M-theory duals
2007
24 pages.-- ISI Article Identifier: 000245078200049.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-th/0611219
The Bethe ansatz and the Tzitzéica–Bullough–Dodd equation
2012
The theory of classically integrable nonlinear wave equations, and the Bethe Ansatz systems describing massive quantum field theories defined on an infinite cylinder, are related by an important mathematical correspondence that still lacks a satisfactory physical interpretation. In this paper we shall describe this link for the case of the classical and quantum versions of the (Tzitz\'eica-)Bullough-Dodd model.
Yangian Symmetry for Fishnet Feynman Graphs
2017
Various classes of fishnet Feynman graphs are shown to feature a Yangian symmetry over the conformal algebra. We explicitly discuss scalar graphs in three, four and six spacetime dimensions as well as the inclusion of fermions in four dimensions. The Yangian symmetry results in novel differential equations for these families of largely unsolved Feynman integrals. Notably, the considered fishnet graphs in three and four dimensions dominate the correlation functions and scattering amplitudes in specific double scaling limits of planar, gamma-twisted N=4 super Yang-Mills or ABJM theory. Consequently, the study of fishnet graphs allows us to get deep insights into the integrability of the plana…
Regards sur les pratiques épistolaires dans le monde monastique : Abbon de Fleury, Constantin de Micy et quelques exemples ligériens (980-1030)
2022
International audience; Dès l’Antiquité tardive, le monachisme oriental témoigne de l’importance des correspondances monastiques tant dans les échanges entre communautés que dans les relations entre les frères et le monde extérieur. L’intérêt de ces échanges est autant dans l’abondance du corpus que dans sa composition, sa diversité et l’étendue des thématiques qui y sont abordées, y compris les plus formelles. En Occident, il faut attendre les temps carolingiens pour observer un net retour de ces pratiques épistolaires en lien avec l’expansion de l’empire et surtout avec le regain de l’intérêt marqué pour l’Antiquité. Les moines ne font pas exception à ce renouveau. Loup de Ferrières ou Ra…
La correspondance entre Arthur Schnitzler et Hugo von Hofmannsthal, ou la rencontre artistique de deux écrivains viennois dans les années 1900
2010
Hugo von Hofmannsthal et Arthur Schnitzler se sont rencontrés dans la Vienne des années 1890, et sont deux représentants importants du cercle des Jeunes Viennois, groupe d'artistes et d'intellectuels réunis par leur aspiration commune au renouvellement de l'art et de la pensée esthétique. Les deux écrivains commencent leur carrière littéraire précisément dans ces années 1890, et les lettres qu'ils commencent à échanger dès cette période témoignent de leur vie sociale en tant qu'artistes de plus en plus reconnus, ainsi que de leurs interrogations, parfois communes, au sujet de la création littéraire. Au fil des ans, l'un et l'autre ont volontiers évoqué dans leurs lettres les métamorphoses d…
Inbreeding does not alter the response to an experimental heat wave in a freshwater snail
2019
Global climate change affects natural populations of many species by increasing the average temperature and the frequency of extreme weather events (e.g. summer heat waves). The ability of organisms to cope with these environmental changes can, however, depend on their genetic properties. For instance, genetic load owing to inbreeding could alter organisms’ responses to climate change-mediated environmental changes but such effects are often overlooked. We investigated the effects of an experimental heat wave (25°C versus 15°C) on life history (reproduction, size) and constitutive immune defence traits (phenoloxidase-like and antibacterial activity of haemolymph) in relation to inbreeding b…
Correspondence: Strongly-driven Re+CO2 redox reaction at high-pressure and high-temperature.
2016
Correspondence: Strongly-driven Re+CO 2 redox reaction at high-pressure and high-temperature