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      Dark matter theory: Implications and future prospects for Fermi

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          Abstract

          I give a brief review of some of the implications of Fermi data for theories of the identity of dark matter, and their combination with data from other complementary probes. I also preview some of the prospects for probing such models with future data.

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          Scalar Phantoms

          Vanda Silveira, A. ZEE (1985)
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            Gauge Singlet Scalars as Cold Dark Matter

            John McDonald (2007)
            In light of recent interest in minimal extensions of the Standard Model and gauge singlet scalar cold dark matter, we provide an arXiv preprint of the paper, published as Phys.Rev. D50 (1994) 3637, which presented the first detailed analysis of gauge singlet scalar cold dark matter.
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              The Minimal Model of Nonbaryonic Dark Matter: A Singlet Scalar

              T. ter Veldhuis, M. Pospelov, C. Burgess (2000)
              We propose the simplest possible renormalizable extension of the Standard Model - the addition of just one singlet scalar field - as a minimalist model for non-baryonic dark matter. Such a model is characterized by only three parameters in addition to those already appearing within the Standard Model: a dimensionless self-coupling and a mass for the new scalar, and a dimensionless coupling, \lambda, to the Higgs field. If the singlet is the dark matter, these parameters are related to one another by the cosmological abundance constraint, implying that the coupling of the singlet to the Higgs field is large, \lambda \sim O(0.1 - 1). Since this parameter also controls couplings to ordinary matter, we obtain predictions for the elastic cross section of the singlet with nuclei. The resulting scattering rates are close to current limits from both direct and indirect searches. The existence of the singlet also has implications for current Higgs searches, as it gives a large contribution to the invisible Higgs width for much of parameter space. These scalars can be strongly self-coupled in the cosmologically interesting sense recently proposed by Spergel and Steinhardt, but only for very low masses (< 1 GeV), which is possible only at the expense of some fine-tuning of parameters.
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                Publication date Created: 06 November 2017
                Article
                ArXiV ID: 1711.01973
                SO-VID: 73efbdc4-7de5-4500-a13c-4c7a4199bb1e
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Comments 8 pages, 5 figures. To appear in the proceedings of the 7th International Fermi Symposium, Garmish, Oct 15-20 2017
                Categories hep-ph astro-ph.CO

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