The semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center

Arcadi, Giorgio; Queiroz, Farinaldo S.; Siqueira, Clarissa

doi:10.1016/j.physletb.2017.10.065

Cited by 31 publications

(28 citation statements)

References 120 publications

(164 reference statements)

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“…As this is clearly not a large effect, and to be most conservative, we choose to use the most recent full data set which gives a weaker limit due to these excesses. (Note this low significance excess can be meaningfully combined with the AMS antiproton excess [74][75][76][77][78]. )…”

Section: Fermimentioning

confidence: 99%

GeV-scale thermal WIMPs: Not even slightly ruled out

et al. 2018

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Weakly interacting massive particles (WIMPs) have long reigned as one of the leading classes of dark matter candidates. The observed dark matter abundance can be naturally obtained by freezeout of weakscale dark matter annihilations in the early Universe. This "thermal WIMP" scenario makes direct predictions for the total annihilation cross section that can be tested in present-day experiments. While the dark matter mass constraint can be as high as m χ ≳ 100 GeV for particular annihilation channels, the constraint on the total cross section has not been determined. We construct the first model-independent limit on the WIMP total annihilation cross section, showing that allowed combinations of the annihilationchannel branching ratios considerably weaken the sensitivity. For thermal WIMPs with s-wave 2 → 2 annihilation to visible final states, we find the dark matter mass is only known to be m χ ≳ 20 GeV. This is the strongest largely model-independent lower limit on the mass of thermal-relic WIMPs; together with the upper limit on the mass from the unitarity bound (m χ ≲ 100 TeV), it defines what we call the "WIMP window." To probe the remaining mass range, we outline ways forward.

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Section: Fermimentioning

confidence: 99%

GeV-scale thermal WIMPs: Not even slightly ruled out

et al. 2018

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“…This signal, if confirmed, is compatible with a DM interpretation of the Galactic center γ-ray excess (GCE) for a variety of annihilation channels. It is also expected to provide a detectable signal in antideuterons [22], and it is compatible with a variety of different beyond-the-standard-model scenarios [21,[23][24][25][26][27][28][29]. However, given the small experimental errors, several important sources of systematic uncertainties, which before could be neglected, now become increasingly important and need to be further investigated.…”

Section: Introductionmentioning

confidence: 96%

Scrutinizing the evidence for dark matter in cosmic-ray antiprotons

et al. 2019

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Global fits of primary and secondary cosmic-ray (CR) fluxes measured by AMS-02 have great potential to study CR propagation models and search for exotic sources of antimatter such as annihilating dark matter (DM). Previous studies of AMS-02 antiprotons revealed a possible hint for a DM signal which, however, could be affected by systematic uncertainties. To test the robustness of such a DM signal, in this work we systematically study two important sources of uncertainties: the antiproton production cross sections needed to calculate the source spectra of secondary antiprotons and the potential correlations in the experimental data, so far not provided by the AMS-02 Collaboration. To investigate the impact of cross-section uncertainties we perform global fits of CR spectra including a covariance matrix determined from nuclear cross-section measurements. As an alternative approach, we perform a joint fit to both the CR and cross-section data. The two methods agree and show that cross-section uncertainties have a small effect on the CR fits and on the significance of a potential DM signal, which we find to be at the level of 3σ. Correlations in the data can have a much larger impact. To illustrate this effect, we determine possible benchmark models for the correlations in a data-driven method. The inclusion of correlations strongly improves the constraints on the propagation model and, furthermore, enhances the significance of the DM signal up to above 5σ. Our analysis demonstrates the importance of providing the covariance of the experimental data, which is needed to fully exploit their potential.

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“…[24]. Indirect detection of Z 3 DM was considered in [25,26]. The cubic coupling can contribute to 3 → 2 scattering for Z 3 strongly interacting (SIMP) DM [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Gravitational wave signals of pseudo-Goldstone dark matter in the Z3 complex singlet model

2020

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We study pseudo-Goldstone dark matter in the Z3 complex scalar singlet model. Because the direct detection spin-independent cross section is suppressed, such dark matter is allowed in a large mass range. Unlike in the original model stabilized by a parity, due to the cubic coupling of the singlet the Z3 model can accommodate first-order phase transitions that give rise to a stochastic gravitational wave signal potentially observable in future space-based detectors.

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The semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center

Cited by 31 publications

References 120 publications

GeV-scale thermal WIMPs: Not even slightly ruled out

GeV-scale thermal WIMPs: Not even slightly ruled out

Scrutinizing the evidence for dark matter in cosmic-ray antiprotons

Gravitational wave signals of pseudo-Goldstone dark matter in the Z3 complex singlet model

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