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WIMP Annual Modulation with Opposite Phase in Late-Infall Halo Models

G. Gelmini·P. Gondolo
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Abstract

We show that in the late-infall model of our galactic halo by P. Sikivie the expected phase of the annual modulation of a WIMP halo signal in direct detection experiments is opposite to the one usually expected. If a non-virialized halo component due to the infall of (collisionless) dark matter particles cannot be rejected, an annual modulation in a dark matter signal should be looked for by experimenters without fixing the phase a-priori. Moreover, WIMP streams coming to Earth from directions above and below the galactic plane should be expected, with a characteristic pattern of arrival directions.

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G. Gelmini, P. Gondolo. 2000-12-22. WIMP Annual Modulation with Opposite Phase in Late-Infall Halo Models. https://doi.org/10.1103/physrevd.64.023504

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