Positrons from particle dark-matter annihilation in the Galactic halo: Propagation Green's functions - art. no. 063003.

Citation
Iv. Moskalenko et Aw. Strong, Positrons from particle dark-matter annihilation in the Galactic halo: Propagation Green's functions - art. no. 063003., PHYS REV D, 6006(6), 1999, pp. 3003
Citations number
42
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
05562821 → ACNP
Volume
6006
Issue
6
Year of publication
1999
Database
ISI
SICI code
0556-2821(19990915)6006:6<3003:PFPDAI>2.0.ZU;2-M
Abstract
We calculate the propagation of positrons from dark-matter particle annihil ation in the Galactic halo in different models of the dark matter halo dist ribution using our three-dimensional code, and present fits to our numerica l propagation Green's functions. We show that the Green's functions are not very sensitive to the dark matter distribution for the same local dark mat ter energy density. We compare our predictions with the computed cosmic ray positron spectra ("background") for the ''conventional" cosmic ray nucleon spectrum which matches the local measurements, and a modified spectrum whi ch respects the limits imposed by measurements of diffuse Galactic gamma ra ys, antiprotons, and positrons. We conclude that significant detection of a dark matter signal requires favorable conditions and precise measurements unless the dark matter is clumpy which would produce a stronger signal. Alt hough our conclusion qualitatively agrees with those of previous authors. i t is based on a mon realistic model of particle propagation and thus reduce s the scope for future speculations. A reliable background evaluation requi res new accurate positron measurements and further developments in modeling production and propagation of cosmic ray species in the Galaxy. [S0556-282 1(99)05116-4].