TL;DR
This paper investigates a light scalar WIMP dark matter candidate linked to DAMA results, showing it can naturally match relic abundance and be tested via gamma and neutrino signals.
Contribution
It establishes a direct relation between relic density and detection rate for light scalar WIMPs via Higgs exchange, connecting DAMA results with cosmological data.
Findings
Light scalar WIMPs with mass < 10 GeV can explain DAMA signals.
Such WIMPs naturally match relic abundance from WMAP.
Indirect detection methods can test this dark matter scenario.
Abstract
A light scalar WIMP is studied in view of the recent results of the DAMA collaboration. In a scenario where both the WIMP's annihilation and its elastic scattering on nuclei occur dominantly through Higgs exchange, a one-to-one relation between the WIMP's relic density and its spin-independent direct detection rate is established. The ratio of the relevant cross sections depends only on the dark matter mass if the range allowed by the DAMA results (m < 10 GeV) is considered. We show that if such a light scalar WIMP possesses a direct detection rate compatible with DAMA, it naturally obtains a relic abundance in agreement with WMAP. Indirect detection both with gammas from the Galactic centre and neutrinos from the Sun opens possibilities to test this light dark matter scenario.
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Taxonomy
TopicsDark Matter and Cosmic Phenomena