Searching for dark matter in the CMB: A compact parametrization of energy injection from new physics
By Douglas P. Finkbeiner, S. Galli, Tongyan Lin, T. Slatyer. 2011
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High-precision measurements of the temperature and polarization anisotropies of the cosmic microwave background radiation have been previously employed to set robust constraints on dark matter annihilation during recombination. In this work we improve and generalize these constraints to apply to energy deposition during the recombination era with arbitrary redshift dependence. Our approach also provides more rigorous and model-independent bounds on dark matter annihilation and decay scenarios. We employ principal component analysis to identify a basis of weighting functions for the energy deposition. The coefficients of these weighting functions parameterize any energy deposition model and can be constrained directly by experiment. For generic energy deposition histories that are currently allowed by WMAP7 data, up to 3 principal component coefficients are measurable by Planck and up to 5 coefficients are measurable by an ideal cosmic variance limited experiment. For WIMP dark matter, our analysis demonstrates that the effect on the CMB is described well by a single (normalization) parameter and a "universal" redshift dependence for the energy deposition history. We give WMAP 7 constraints on both generic energy deposition histories and the universal WIMP case.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/2651054641ce8e97963d8170b8c046257fb408a2
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Citations in the corpus
- Measurements of the Temperature and E-mode Polarization of the CMB from 500 Square Degrees of SPTpol Data (2017, methodology): “While we do not highlight them in this section, we also studied adding running of the scalar spectra index dnsdk as well as energy injection from dark matter particle annihilation based on the work of Finkbeiner et al. (2012).”
- Constraining light dark matter with diffuse X-ray and gamma-ray observations (2013, background): “Constraints from the Cosmic Microwave Background (CMB) already limit the s-wave DM annihilation cross section to SM matter to be below that of a thermal WIMP, for DM masses below ∼ 7 GeV [24–27].”
- Dark matter models and direct detection (2019, background): “CMB bounds on DM annihilation are quoted in terms of an effective efficiency feff, which has been shown to capture most of the effects [86].”
- Galactic Searches for Dark Matter (2012, background): “Several authors have recently developed the theory for energy injection by WIMPs (Galli et al., 2009; Slatyer et al., 2009; Huetsi et al., 2009; Finkbeiner et al., 2012); these authors show how the constraints on the WIMP mass and cross section are particularly sensitive to the fraction of the…”