Cosmic Ray Diffusion in the Galaxy and Diffuse Gamma Emission

In this key contribution to modern cosmic ray physics, the author presents fresh numerical code for modeling cosmic ray propagation, and sets out credible evidence for a new spectral component that could be generated by the destruction or decay of dark matter.

The original work presented in this thesis constitutes an important contribution to modern Cosmic Ray (CR) physics, and comes during one of the most exciting periods of this field.
The first part introduces a new numerical code (DRAGON) to model the CR propagation in our Galaxy. The code is then used to perform a combined analysis of CR data, making it possible to determine their propagation properties with unprecedented accuracy.
The second part is dedicated to a theoretical interpretation of the recent crucial experimental results on cosmic electron and positron spectra (PAMELA, Fermi-LAT experiments). Using the tools developed in the first part of the thesis, the author convincingly argues for the existence of a new spectral component, which could arise either from local astrophysical sources, such as pulsars, or from Dark Matter annihilation or decay.
This thesis is a highly advanced work; the methods, analysis and results are clearly and carefully presented. This work is set to become an important reference document for any future work in this area.

Introduces a new numerical code to model the Cosmic Ray propagation in our Galaxy Presents convincing evidence for a new spectral component arising either from local astrophysical sources, or from Dark Matter annihilation or decay Written by a member of a team winning the 2011 Bruno Rossi prize Includes supplementary material: sn.pub/extras

Autorentext
As a member of the Fermi-LAT team Daniele Gaggero has been awarded of the 2011 Bruno Rossi prize of the High Energy Division (HEAD) of the American Astronomical Association.

Inhalt

Introduction.- Cosmic Ray diffusion in the Galaxy.- Numerical codes that solve the CR diffusion equations.- Propagation of CR nuclei: our results.- The leptonic field.- Diffuse gamma ray emission from the Galaxy.- Conclusions and future plans. A The diffusion equation in cylindrical coordinates.- B DRAGON code: a description.- C Solution of the transport equation for a Pulsar-like source.