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Colloquium: Annual modulation of dark matter

Katherine Freese*, Mariangela Lisanti, and Christopher Savage

Katherine Freese*

  • Michigan Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA and Physics Department, Caltech, Pasadena, California 91101, USA

Mariangela Lisanti

  • Princeton Center for Theoretical Science, Princeton University, Princeton, New Jersey 08544, USA

Christopher Savage

  • The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden and Department of Physics & Astronomy, University of Utah, Salt Lake City, Utah 84112, USA

  • *ktfreese@umich.edu
  • mlisanti@princeton.edu
  • savage@physics.utah.edu

Rev. Mod. Phys. 85, 1561 – Published 1 November, 2013

DOI: https://doi.org/10.1103/RevModPhys.85.1561

Abstract

Direct detection experiments, which are designed to detect the scattering of dark matter off nuclei in detectors, are a critical component in the search for the Universe’s missing matter. This Colloquium begins with a review of the physics of direct detection of dark matter, discussing the roles of both the particle physics and astrophysics in the expected signals. The count rate in these experiments should experience an annual modulation due to the relative motion of the Earth around the Sun. This modulation, not present for most known background sources, is critical for solidifying the origin of a potential signal as dark matter. The focus is on the physics of annual modulation, discussing the practical formulas needed to interpret a modulating signal. The dependence of the modulation spectrum on the particle and astrophysics models for the dark matter is illustrated. For standard assumptions, the count rate has a cosine dependence with time, with a maximum in June and a minimum in December. Well-motivated generalizations of these models, however, can affect both the phase and amplitude of the modulation. Shown is how a measurement of an annually modulating signal could teach us about the presence of substructure in the galactic halo or about the interactions between dark and baryonic matter. Although primarily a theoretical review, the current experimental situation for annual modulation and future experimental directions is briefly discussed.

Article Text

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