Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-08
FrascatiPhys.Ser.35:115-124,2004
Astronomy and Astrophysics
Astrophysics
10 pages, no figures. Invited review talk at the 3rd Int. Conf. on Frontier Science "Physics and Astrophysics in Space," Frasc
Scientific paper
This paper presents an introduction to the astrophysics of cosmic rays and diffuse gamma rays and discusses some of the puzzles that have emerged recently due to more precise data and improved propagation models: the excesses in Galactic diffuse gamma-ray emission, secondary antiprotons and positrons, and the flatter than expected gradient of cosmic rays in the Galaxy. These also involve the dark matter, a challenge to modern physics, through its indirect searches in cosmic rays. Though the final solutions are yet to be found, I discuss some ideas and results obtained mostly with the numerical propagation model GALPROP. A fleet of spacecraft and balloon experiments targeting these specific issues is set to lift off in a few years, imparting a feeling of optimism that a new era of exciting discoveries is just around the corner. A complete and comprehensive discussion of all the recent results is not attempted here due to the space limitations.
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