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Earth-mass dark halos are torn into dark mini-streams by stars | | HongSheng Zhao
; James E. Taylor
; Joseph Silk
; Dan Hooper
; | | Date: |
2 Feb 2005 | | Subject: | astro-ph | | Affiliation: | St. Andrews), James E. Taylor (Caltech), Joseph Silk, Dan Hooper (Oxford | | Abstract: | The promising neutralino dark matter particles generically condense into numerous earth-mass dark halos with smaller substructures suppressed by free streamingcite{berezinsky}. The recent {it Letter to Nature}cite{moore} claims that these 0.01pc-sized dense halos emerged at redshifts 60--26 are rarely destructed inside galaxies, hence the nearest halos at about 0.1pc from Earth are bright in annihilation-powered gamma-rays, but are inaccessible to direct detections. However, most mini-halos reaching solar neighbourhood should experience strong impulses by individual stars in the Galactic disk and bulge, and have been torn into pc-long tidal streams over a Hubble time with only modest overdensity, reducing indirect annihilation signals. Sweeping across the solar system per century, mini-streams leave directional and temporal signatures for direct searches of neutralinos. | | Source: | arXiv, astro-ph/0502049 | | Services: | Forum | Review | PDF | Favorites | |
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