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42 papers · 1 filter
A Matrix Approach to Numerical Solution of the DGLAP Evolution Equations
Philip G. Ratcliffe
A matrix-based approach to numerical integration of the DGLAP evolution equations is presented. The method arises naturally on discretisation of the Bjorken x variable, a necessary…
The 0.1-200 keV spectrum of the blazar PKS 2005-489 during an active state
G. Tagliaferri, G. Ghisellini, P. Giommi +8
The bright BL Lac object PKS 2005-489 was observed by BeppoSAX on November 1-2, 1998, following an active X-ray state detected by RossiXTE. The source, detected between 0.1 and 200…
Extragalactic Background Light, MACHOs, and the Cosmic Stellar Baryon Budget
Piero Madau, Francesco Haardt, Lucia Pozzetti
The optical/far-IR extragalactic background light (EBL) from both resolved and unresolved extragalactic sources is an indicator of the total luminosity of cosmic structures, as the…
Hyperon Beta-Decay Analysis and the Recent KTeV Data
Philip G. Ratcliffe
The analysis of hyperon semi-leptonic decay data is addressed with reference to SU(3) breaking and isospin mixing between Lambda^O and Sigma^O. Various approaches to SU(3) breaking…
Magnetic Field Effect for Two Electrons in a Two Dimensional Random Potential
Giuliano Benenti, Dima L. Shepelyansky
We study the problem of two particles with Coulomb repulsion in a two-dimensional disordered potential in the presence of a magnetic field. For the regime, when without interaction…
Explicitly correlated trial wave functions in Quantum Monte Carlo calculations of excited states of Be and Be-
Luca Bertini, Dario Bressanini, Massimo Mella +1
We present a new form of explicitly correlated wave function whose parameters are mainly linear, to circumvent the problem of the optimization of a large number of non-linear param…