Propagation of Cosmic Rays and Diffuse Galactic Gamma Rays
- Moskalenko, Igor V.
- Physical Description:
- 1 electronic document
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- 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.
- Other Subject(s):
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 20040171691.
Science 2004: Physics and Astrophysics in Space; 14-19 Jun. 2004; Frascati; Italy.
Frascati Physics Series; Volume 15; 1-11.
- Copyright, Distribution under U.S. Government purpose rights.
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