Relic densities including Sommerfeld enhancements in the MSSM

Hryczuk, Andrzej; Iengo, Roberto; Ullio, Piero

doi:10.1007/jhep03(2011)069

Cited by 123 publications

(147 citation statements)

References 69 publications

(118 reference statements)

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“…As already extensively discussed in the literature, the impact of Sommerfeld-enhanced annihilation rates on the DM relic density can be sizable both before [53][54][55][56][57][58] and after [17][18][19] kinetic decoupling. In this article, we have introduced a general framework that, for the first time, allows to consistently describe situations where DM an- 4 This would lead to the conclusion that this or very similar leptophilic models cannot account for the cosmic ray lepton excess without violating the gamma-ray constraints from clusters if Mcut ≤ 10 4 M [33].…”

Section: Discussionmentioning

confidence: 79%

“…Ref. [61] for a recent discussion), more classical WIMPs like heavy neutralino DM [53,57,58] or models where the annihilation rate is enhanced through the formation of bound states [62] or an s-channel resonance [63]. In fact, in order to ob-tain reliable estimates for both the relic density and the small-scale cutoff of matter density perturbations in these cases, we have demonstrated here that it is mandatory to use a framework that consistently takes into account the intertwined nature of WIMP annihilation into, and scattering with, heat-bath particles in the early universe.…”

Section: Discussionmentioning

confidence: 99%

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Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates

2012

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We consider dark matter consisting of weakly interacting massive particles (WIMPs) and revisit in detail its thermal evolution in the early universe, with a particular focus on models where the annihilation rate is enhanced by the Sommerfeld effect. After chemical decoupling, or freeze-out, dark matter no longer annihilates but is still kept in local thermal equilibrium due to scattering events with the much more abundant standard model particles. During kinetic decoupling, even these processes stop to be effective, which eventually sets the scale for a small-scale cutoff in the matter density fluctuations. Afterwards, the WIMP temperature decreases more quickly than the heat bath temperature, which causes dark matter to reenter an era of annihilation if the cross-section is enhanced by the Sommerfeld effect. Here, we give a detailed and self-consistent description of these effects. As an application, we consider the phenomenology of simple leptophilic models that have been discussed in the literature and find that the relic abundance can be affected by as much two orders of magnitude or more. We also compute the mass of the smallest dark matter subhalos in these models and find it to be in the range O(10 −10 M ) − O(10 M ); even much larger cutoff values are possible if the WIMPs couple to force carriers lighter than about 100 MeV. We point out that a precise determination of the cutoff mass allows to infer new limits on the model parameters, in particular from gamma-ray observations of galaxy clusters, that are highly complementary to existing constraints from g − 2 or beam dump experiments.PACS numbers: 95.35.+d, 98.80.Cq, 95.30.Tg

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates

2012

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“…The Wino dark matter annihilation cross section is significantly larger than the canonical value for WIMPs due to a nonperturbative effect known as Sommerfeld enhancement (SE) [16][17][18][19][20]. The SE calculation for heavy WIMPs is subject to large logarithmic corrections due to the large hierarchy between the dark matter mass and the W-boson mass.…”

Section: Introductionmentioning

confidence: 99%

Indirect and direct detection prospect for TeV dark matter in the nine parameter MSSM

et al. 2015

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“…Considering the Sommerfeld enhancement, a wino-like neutralino can have the correct relic density naturally for a mass of about 2.8 TeV in absence of other co-annihilations, and 1 TeV for a Higgsino [20,21]. Careful studies about the consequences of the Sommerfeld enhancement in the context of relic density and indirect detection in the MSSM can be found in [22][23][24][25][26][27].…”

Section: Relic Densitymentioning

confidence: 99%

Robustness of dark matter constraints and interplay with collider searches for New Physics

Arbey

Robbins

Mahmoudi

et al. 2017

J. High Energ. Phys.

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Abstract:We study the implications of dark matter searches, together with collider constraints, on the phenomenological MSSM with neutralino dark matter and focus on the consequences of the related uncertainties in some detail. We consider, inter alia, the latest results from AMS-02, Fermi-LAT and XENON1T. In particular, we examine the impact of the choice of the dark matter halo profile, as well as the propagation model for cosmic rays, for dark matter indirect detection and show that the constraints on the MSSM differ by one to two orders of magnitude depending on the astrophysical hypotheses. On the other hand, our limited knowledge of the local relic density in the vicinity of the Earth and the velocity of Earth in the dark matter halo leads to a factor 3 in the exclusion limits obtained by direct detection experiments. We identified the astrophysical models leading to the most conservative and the most stringent constraints and for each case studied the complementarities with the latest LHC measurements and limits from Higgs, SUSY and monojet searches. We show that combining all data from dark matter searches and colliders, a large fraction of our supersymmetric sample could be probed. Whereas the direct detection constraints are rather robust under the astrophysical assumptions, the uncertainties related to indirect detection can have an important impact on the number of the excluded points.

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Relic densities including Sommerfeld enhancements in the MSSM

Cited by 123 publications

References 69 publications

Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates

Thermal decoupling and the smallest subhalo mass in dark matter models with Sommerfeld-enhanced annihilation rates

Indirect and direct detection prospect for TeV dark matter in the nine parameter MSSM

Robustness of dark matter constraints and interplay with collider searches for New Physics

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