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
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].