Earth-mass dark halos are torn into dark mini-streams by stars

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dc.creatorZhao, HongSheng
dc.creatorTaylor, James E.
dc.creatorSilk, Joseph
dc.creatorHooper, Dan
dc.date2005-02-02
dc.date2005-02-09
dc.date.accessioned2026-07-07T02:16:55Z
dc.date.available2026-07-07T02:16:55Z
dc.descriptionThe promising neutralino dark matter particles generically condense into numerous earth-mass dark halos with smaller substructures suppressed by free streaming\cite{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.
dc.descriptionSubmitted to nature, 4 pages, no figures; more robust estimations of star density in disk and bulge are made. Text is shortened to fit Nature limit
dc.identifierhttps://arxiv.org/abs/astro-ph/0502049
dc.identifierhttp://arxiv.org/abs/astro-ph/0502049
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8977
dc.subjectAstrophysics
dc.titleEarth-mass dark halos are torn into dark mini-streams by stars
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