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28 papers · 1 filter
Sufficient Conditions for Conservativity of Minimal Quantum Dynamical Semigroups
Alexander Chebotarev, Franco Fagnola
The conservativity of a minimal quantum dynamical semigroup is proved whenever there exists a ``reference'' subharmonic operator bounded from below by the dissipative part of the i…
On the ERG approach in Well Developed Turbulence
Renzo Collina, Paolo Tomassini
We apply the method of the Renormalization Group (GR), following the Polchinski point of view, to a model of well developed and isotropic fluid turbulence. The Galilei-invariance i…
The gluon contribution to the polarized structure function
A. Gabrieli, G. Ridolfi
We compute the structure function for a gluon target in perturbative QCD at order $\as$. We show that its first moment vanishes, as predicted by the Burkhardt-Cottingham sum…
The GRAAL high resolution BGO calorimeter and its energy calibration and monitoring system
F. Ghio, B. Girolami, M. Capogni +13
We describe the electromagnetic calorimeter built for the GRAAL apparatus at the ESRF. Its monitoring system is presented in detail. Results from tests and the performance obtained…
Duality, Central Charges and Entropy of Extremal BPS Black Holes
L. Andrianopoli, R. D'Auria, S. Ferrara
We report on some general results on the physics of extremal BPS black holes in four and five dimensions. The duality-invariant entropy-formula for all extended supergravitie…
An Exact Renormalization Group analysis of 3-d Well Developed turbulence
Paolo Tomassini
We take advantage of peculiar properties of three dimensional incompressible turbulence to introduce a nonstandard Exact Renormalization Group method. A Galilean invariance preserv…