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arXiv · 1708.00181

Halo-independence with quantified maximum entropy at DAMA/LIBRA

Andrew Fowlie
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Abstract

Using the DAMA/LIBRA anomaly as an example, we formalise the notion of halo-independence in the context of Bayesian statistics and quantified maximum entropy. We consider an infinite set of possible profiles, weighted by an entropic prior and constrained by a likelihood describing noisy measurements of modulated moments by DAMA/LIBRA. Assuming an isotropic dark matter (DM) profile in the galactic rest frame, we find the most plausible DM profiles and predictions for unmodulated signal rates at DAMA/LIBRA. The entropic prior contains an a priori unknown regularisation factor, $β$, that describes the strength of our conviction that the profile is approximately Maxwellian. By varying $β$, we smoothly interpolate between a halo-independent and a halo-dependent analysis, thus exploring the impact of prior information about the DM profile.

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Andrew Fowlie. 2017-10-18. Halo-independence with quantified maximum entropy at DAMA/LIBRA. https://doi.org/10.1088/1475-7516%2F2017%2F10%2F002

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