Effective interactions that violate Newton's third law of action-reaction symmetry are common in systems where interactions are mediated by a non-equilibrium environment. Extensive Monte Carlo simulations are carried out on a two-dimensional Ising model, where the interactions are modified non-reciprocally. We demonstrate that the critical temperature decreases as the non-reciprocity increases and this decrease depends only on the magnitude of non-reciprocity. Further, travelling spin waves due to the local fluctuations in magnetisation are observed and these spin waves travel opposite to the non-reciprocity vector.
Jean-Yonnel Chastaing, Jean-Christophe Géminard, Eric Bertin
We study from a statistical physics perspective the dynamics of a bouncing ball maintained in a chaotic regime thanks to collisions with a plate experiencing an aperiodic vibration. We analyze in details the energy exchanges between the bead and the vibrating plate, and show that the coupling between the bead and the plate can be modeled in terms of both a dissipative process and an injection mechanism by an energy reservoir, where the dynamics of the reservoir obeys only a 'blurred' version of detailed balance. An analysis of the injection statistics in terms of fluctuation relation is also provided.
AbstractMittels des COND‐Berechnungsalgorithmus können eindimensionale Konstruktionsaufbauten hinsichtlich des hygrothermischen Verhaltens in der Kondensationsperiode bewertet werden. In Ergänzung zum Standardverfahren (Glaser) nach DIN 4108‐3 berücksichtigt COND den kapillaren Transport von Kondensat. Damit lässt sich der Feuchteschutznachweis auch für moderne praxisbewährte Innendämmsysteme führen, die nach Glaser nicht nachweisfähig sind. Der Berechnungsalgorithmus wird in der überarbeiteten, allgemeingültigen Form detailliert und vollständig dargestellt und beschrieben. Das Materialmodell und eingeführte Vereinfachungen werden diskutiert. Abschließend werden Einsatzbereiche und Grenzen des Verfahrens erläutert.With the COND algorithm architects and engineers may evaluate one‐dimensional constructions with respect to their hygrothermal behavior within a condensation period. COND considers, in contrast to the standard method (Glaser‐method) according to DIN 4108‐3, the capillary transport of interstitial condensate. The method allows hygrothermal verification of constructions, including modern internal insulation systems. Such systems, proven to be effective in practice but not verifiable with the Glaser method, may be analyzed and certified with the COND method. The article includes a full and detailed description of this computational algorithm. The paper discusses the material model and introduced simplifications, and concludes with a review on application fields and limits of the method.
Some of the in-plane paraconductivity measurements that Rullier-Albenque and coworkers have presented in a recent manuscript (cond-mat/1102.2804) are compared here with the Gaussian-Ginzburg-Landau (GGL) approach for layered superconductors, extended by Carballeira and coworkers [Phys. Rev. B 63, 144515 (2001)] to high reduced-temperatures by introducing a so-called total-energy cuto. In contrast with the conclusions of Rullier-Albenque and coworkers, it is shown that these experimental data may be explained at a quantitative level, in all the reduced-temperature regions covered by the measurements, by this extended GGL approach.
The problem of crack pattern formation due to thermal shock loading at the surface of half-space is solved numerically using two-dimensional boundary element method. The results of numerical simulations with 100-200 random simultaneously growing and interacting cracks are used to obtain scaling relations for crack length and spacing. The numerical results predict that such process of pattern formation with quasi-static crack growth is not stable and at some point the excess energy leads to unstable propagation of one of the longest crack. The onset of instability has also been determined from numerical results.
We calculate heating rate, attractive conservative and tangential dissipative fluctuation electromagnetic forces felt by a thick plate moving with nonrelativistic velocity parallel to a closely spaced another plate in rest using relativistic fluctuation electrodynamics. We argue that recently developed relativistic out of equilibrium theory of fluctuation electromagnetic interactions [A.I. Volokitin, B.N.J. Persson, Phys. Rev. B78 (2008) 155437; arXiv:/cond-mat.other/0807.1004v1, 2008] has serious drawbacks.