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10 papers · 1 filter
Transmission amplitudes from Bethe ansatz equations
Anastasia Doikou, Nikos Karaiskos
We consider the Heisenberg spin chain in the presence of integrable spin defects. Using the Bethe ansatz methodology, we extract the associated transmission amplitudes, that descri…
Explicit Construction of First Integrals by Singularity Analysis in Nonlinear Dynamical Systems
Ch. Efthymiopoulos, T. Bountis, T. Manos
The Painleve and weak Painleve conjectures have been used widely to identify new integrable nonlinear dynamical systems. The calculation of the integrals relies though on methods q…
A new information metric and a possible higher bound for a class of measurements in the Quantum Estimation Problem
Demetris P. K. Ghikas, Fotios Oikonomou
Information metrics give lower bounds for the estimation of parameters. The Cencov-Morozova-Petz Theorem classifies the monotone quantum Fisher metrics. The optimum bound for the q…
Discovery of optical candidate supernova remnants in Sagittarius
J. Alikakos, P. Boumis, P. E. Christopoulou +1
During an [O III] survey for planetary nebulae, we identified a region in Sagittarius containing several candidate Supernova Remnants and obtained deep optical narrow-band images a…
Sigma models in the presence of dynamical point-like defects
Anastasia Doikou, Nikos Karaiskos
Point-like Liouville integrable dynamical defects are introduced in the context of the Landau-Lifshitz and Principal Chiral (Faddeev-Reshetikhin) models. Based primarily on the und…
Design and Implementation of Distributed Resource Management Mechanisms for Wireless Mesh Networks
George Athanasiou, Leandros Tassiulas
In this paper we design and implement a resource management scheme based on cooperative association, where the STAs can share useful information in order to improve the performance…