Symmetric and asymmetric light dark matter

By Tongyan Lin, Hai-Bo Yu, K. Zurek. 2011

161 citations recorded by the source corpus.

to DM ratio to be less than ∼ 2 × 10 −6 (10 −1 ) for DM mass mX = 1 MeV (10 GeV) with ionizing efficiency factorf ∼ 1. We determine the minimum annihilation cross section for achieving these asymmetries subject to the relic density constraint; these cross sections are larger than the usual thermal annihilation cross section. On account of collider constraints, such annihilation cross sections can only be obtained by invoking light mediators. These light mediators can give rise to significant DM self-interactions, and we derive a lower bound on the mediator mass from elliptical DM halo shape constraints. We find that halo shapes require a mediator with mass m� & 4 × 10 −2 MeV (40 MeV) for mX =1 MeV (10 GeV). We map all of these constraints to the parameter space of DM-electron and DM-nucleon scattering cross sections for direct detection. For DM-electron scattering, a significant fraction of the parameter space is already ruled out by beam-dump and supernova cooling constraints.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c06ee49af137f73a36afefc4700db16cd7a6034c

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In Astronomy and Astrophysics

1. Tongyan Lin
2. S. Knapen
3. T. Volansky
4. R. Essig
5. M. Lisanti
6. G. Krnjaic
7. G. Lanfranchi
8. Emidio Gabrielli

In Nuclear and High Energy Physics

1. Tongyan Lin
2. R. Essig
3. K. Zurek
4. S. Knapen
5. T. Volansky
6. M. Lisanti
7. G. Krnjaic
8. J. Mardon

Citations in the corpus

• Dark matter, millicharges, axion and scalar particles, gauge bosons, and other new physics with LDMX (2018, background): “See also [132, 133] for a discussion.”
• Constraining light dark matter with low-energy e+e− colliders (2013, background): “In this scenario, the A′ is the massive mediator of a broken Abelian gauge group, U(1)′, in the hidden sector, and has a small kinetic mixing, ε/ cos θW , with SM hypercharge, U(1)Y [42–44, 56, 60–62].”
• Dark matter models and direct detection (2019, background): “The relic density then depends on both the annihilation rate and the asymmetry [49, 50].”
• Modulation Effects in Dark Matter-Electron Scattering Experiments (2015, methodology): “One example is the class of dark-photon mediated models (see, for example, [7, 18]) in which the DM is charged under a hidden U (1) gauge group that has a small mixing with the Standard Model photon.”
• Light dark matter: Models and constraints (2017, background): “Moreover, for mχ & MeV massive vector mediator models have been discussed extensively in the literature already [121–126], especially for the case of a kinetically mixed dark photon.”
• The Dark Photon (2020, background): “…bound from soft scattering quoted in (Ackerman et al., 2009), GNm 4 χN 8α2D & 50 log GNm 2 χN 2αD , (18) where N is the number of dark-matter particles and GN is Newton’s constant, as well about a factor of 3.5 weaker than (Feng et al., 2009) (see, also, (Feng et al., 2010; Lin et al., 2012)).”