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39 papers · 1 filter
Cycles structure and local ordering in complex networks
Guido Caldarelli, Romualdo Pastor-Satorras, Alessandro Vespignani
We study the properties of metrics aimed at the characterization of grid-like ordering in complex networks. These metrics are based on the global and local behavior of cycles of or…
String interactions and discrete symmetries of the pp-wave background
Chong-Sun Chu, Michela Petrini, Rodolfo Russo +1
Free string theory on the plane-wave background displays a discrete Z2 symmetry exchanging the two transverse SO(4) rotation groups. This symmetry should be respected also at the i…
Groupes de Selmer et accouplements
Bernadette Perrin-Riou
Nekovář vient de démontrer que le rang de $E(\Q)$ pour une courbe elliptique définie sur $\Q$ est de même parité que la multiplicité du zéro en de la fonction comp…
Maskit combinations of Poincare-Einstein metrics
Rafe Mazzeo, Frank Pacard
We establish a boundary connected sum theorem for asymptotically hyperbolic Einstein metrics; this requires no nondegeneracy hypothesis. We also show that if the two metrics have s…
Combinatorics of Boson Normal Ordering: the Dobinski Formula Revisited
Karol A. Penson, Allan I. Solomon
We derive explicit formulas for the normal ordering of powers of arbitrary monomials of boson operators. These formulas lead to generalisations of conventional Bell and Stirling nu…
Initial conditions, Discreteness and non-linear structure formation in cosmology
Francesco Sylos Labini, Thierry Baertschiger, Andrea Gabrielli +1
In this lecture we address three different but related aspects of the initial continuous fluctuation field in standard cosmological models. Firstly we discuss the properties of the…