By Daniele Gaggero
The unique paintings offered during this thesis constitutes a big contribution to fashionable Cosmic Ray (CR) physics, and is derived in the course of probably the most interesting classes of this box.
The first half introduces a brand new numerical code (DRAGON) to version the CR propagation in our Galaxy. The code is then used to accomplish a mixed research of CR information, making it attainable to figure out their propagation houses with unparalleled accuracy.
The moment half is devoted to a theoretical interpretation of the new an important experimental effects on cosmic electron and positron spectra (PAMELA, Fermi-LAT experiments). utilizing the instruments built within the first a part of the thesis, the writer convincingly argues for the life of a brand new spectral part, that could come up both from neighborhood astrophysical resources, comparable to pulsars, or from darkish topic annihilation or decay.
This thesis is a hugely complicated paintings; the tools, research and effects are sincerely and thoroughly provided. This paintings is decided to turn into an immense reference record for any destiny paintings during this area.
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Extra resources for Cosmic Ray Diffusion in the Galaxy and Diffuse Gamma Emission
In this simplified framework it is possible to find an exact solution of the diffusion equation. 85]; for every δ in this interval, a confidence region for vC and v A was found. Another important result was obtained by this group in Donato et al. 2004 : in this paper the contribution of Particle Dark Matter annihilation to CR antiproton flux is investigated, with particular focus on the uncertainties due to different values of the propagation parameters. The authors present thee models, called MIN, MED and MAX.
Fermi, On the origin of the cosmic radiation. Phys. Rev. 75, 1169–1174 (1949) 2. M. Ferrière, The interstellar environment of our galaxy. Rev. Mod. Phys. 73, 1031–1066 (2001) 3. H. Oort. A summary and assessment of current 21-cm results concerning spiral and disk structures in our galaxy. In URSI Symposium 1: Paris Symposium on Radio Astronomy, ed. N. Bracewell, vol. 9 of IAU Symposium 1959. p. 409 References 27 4. A. Benjamin. The spiral structure of the galaxy: something old, something new...
3) where the index i refers to the spatial grid while the indexes n + 1 and n refer to the evaluation of the quantities at time t + t and t. e. stable for all values of t). The accuracy is second order in both space and time. e. a partial differential equation with two spatial partial derivatives; the generalized methods that are generally adopted are the Operator Splitting (OS) and the more accurate Alternate Direction Implicit (ADI). The Operator Splitting procedure is simple. 4) where the operator L is a sum of m pieces: L = L1 + L1 + ...