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54 papers · 1 filter
The hard X-ray spectrum of Compton-thick Seyfert 2 galaxies and the synthesis of the XRB
Giorgio Matt, Fulvio Pompilio, Fabio La Franca
A synthesis model for the cosmic X-ray Background (XRB) is presented, which includes a proper treatment of Compton scattering in the absorbing matter for type 2 AGN. Evidence for a…
The crucial problem: the electroweak symmetry breaking
G. Altarelli
1. Why we do Believe in the Standard Model 2. Why we do not Believe in the Standard Model 2.1 Conceptual Problems 2.2 Hints from Experiment 2.2.1 Unification of Couplings 2.2.2 Dar…
Non-Invariant Ground States, Thermal Average, and generalized Fermionic Statistics
Roberto Mignani, Roberto Scipioni
We present an approach to generalised fermionic statistics which relates the existence of a generalised statistical behaviour to non-invariant ground states. Considering the therma…
Explicit Resolutions of Double Point Singularities of Surfaces
Alberto Calabri, Rita Ferraro
Locally analytically, any isolated double point occurs as a double covering of a smooth surface. It can be desingularized via the canonical resolution, as it is well-known. In this…
Resummation of Singlet Parton Evolution at Small x
Guido Altarelli, Richard D. Ball, Stefano Forte
We propose an improvement of the splitting functions at small x which overcomes the apparent problems encountered by the BFKL approach. We obtain a stable expansion for the x-evolu…
Effects of Kerr Spacetime on Spectral Features from X-Ray Illuminated Accretion Discs
A. Martocchia, V. Karas, G. Matt
We performed detailed calculations of the relativistic effects acting on both the reflection continuum and the iron line from accretion discs around rotating black holes. Fully rel…