Implications of the <i>Fermi</i>-LAT Pass 8 Galactic Center excess on supersymmetric dark matter

Achterberg, A.; Beekveld, Melissa van; Caron, S.; Gomez-Vargas, G. A.; Hendriks, Luc; Austri, Roberto Ruiz de

doi:10.1088/1475-7516/2017/12/040

Cited by 28 publications

(45 citation statements)

References 96 publications

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“…• of the Galactic Centre, is indeed a place where an increased density of dark matter is expected. Given the unknowns in any dark matter model, the excess can of course be also fitted as originating from dark matter annihilations, as indeed it has (see, e.g., [141][142][143][144][145] although the literature is vast on this topic). The main "result" of these claims is that a dark matter particle in the mass range of a few tens of GeV to a few hundred GeV, annihilating to soft (typically bb or τ + τ − ) or hard (typically W + W − or tt), channels can fit the data.…”

Section: Gamma-and X-raysmentioning

confidence: 99%

Status, Challenges and Directions in Indirect Dark Matter Searches

Heros

2020

Symmetry

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Indirect searches for dark matter are based on detecting an anomalous flux of photons, neutrinos or cosmic-rays produced in annihilations or decays of dark matter candidates gravitationally accumulated in heavy cosmological objects, like galaxies, the Sun or the Earth. Additionally, evidence for dark matter that can also be understood as indirect can be obtained from early universe probes, like fluctuations of the cosmic microwave background temperature, the primordial abundance of light elements or the Hydrogen 21-cm line. The techniques needed to detect these different signatures require very different types of detectors: Air shower arrays, gamma- and X-ray telescopes, neutrino telescopes, radio telescopes or particle detectors in balloons or satellites. While many of these detectors were not originally intended to search for dark matter, they have proven to be unique complementary tools for direct search efforts. In this review we summarize the current status of indirect searches for dark matter, mentioning also the challenges and limitations that these techniques encounter.

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Section: Gamma-and X-raysmentioning

confidence: 99%

Status, Challenges and Directions in Indirect Dark Matter Searches

Heros

2020

Symmetry

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“…One should however note that, once MSSM is accepted as the new physics prevailing at low-energy, there is just one DM candidate, and thus one has to take the lower limit on Ωh 2 as binding. This fact, often ignored, strengthens the constraints on a particular MSSM spectrum, and will be applied in our analysis more stringently than in most recent studies [13][14][15][16][17].…”

Section: Contentsmentioning

confidence: 57%

Dark matter, extra-terrestrial gamma-rays and the MSSM: a viability study

Kar

Mitra²,

Mukhopadhyaya

et al. 2018

J. Cosmol. Astropart. Phys.

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We fit the γ-ray excess from the galactic centre (GC) in terms of parameters of the minimal supersymmetric standard model (MSSM). Consistency with other γ-ray observation, such as those from dwarf spheroidal galaxies, is also ensured, in addition to the constraints from direct dark matter search. Furthermore, we expect the contribution to the relic density from the MSSM dark mater candidate, namely, the lightest neutralino, should not go below the stipulated value; otherwise it will amount to going beyond the MSSM by including some additional dark matter source. After a detailed scan of the parameter space in terms of four representative types of particle spectra, we identify the ones that are best fit to the observed data. However, these two are somewhat unsatisfactory in terms of χ 2 min as well as p-values. In some case(s), the unacceptability of low-χ 2 min regions due to direct search constraint is responsible for this. In others, the observed shape of the γ-ray spectrum makes the fits unsatisfactory. The imposed lower limit on relic density, too, has a role to play all along. On the whole, the conclusion is that the MSSM is not a very satisfactory fit for the GC γ-ray compounded with other cosmological observations and direct search limits.

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“…In general, the interpretation of the low energy GCE as originated by DM annihilation is not easy to reconcile with DM direct detection constraints, since in particular models the region able to reproduce the excess is already excluded by current experiments: for instance in the context of the minimal supersymmetric standard model, DM can only account for a ∼ 40 % of the low energy (E < 10 GeV) GCE [42]. In our sterile neutrino portal scenario direct detection limits can be easily avoided, provided the mixing angle between the SM Higgs and the dark scalar is small enough; since the relic abundance is determined by the DM annihilation into sterile neutrinos, it is possible to obtain the correct one independently of such mixing.…”

Section: Analysis Of the Galactic Center Gamma-ray Excess Within The mentioning

confidence: 99%

Probing the sterile neutrino portal to Dark Matter with γ rays

Folgado¹,

Gomez-Vargas²,

Rius³

et al. 2018

J. Cosmol. Astropart. Phys.

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Sterile neutrinos could provide a link between the Standard Model particles and a dark sector, besides generating active neutrino masses via the seesaw mechanism type I. We show that, if dark matter annihilation into sterile neutrinos determines its observed relic abundance, it is possible to explain the Galactic Center γ-ray excess reported by the Fermi-LAT Collaboration as due to an astrophysical component plus dark matter annihilations. We observe that sterile neutrino portal to dark matter provides an impressively good fit, with a p-value of 0.78 in the best fit point, to the Galactic Center γ-ray flux, for DM masses in the range (40-80) GeV and sterile neutrino masses 20 GeV M N < M DM . Such values are compatible with the limits from Fermi-LAT observations of the dwarfs spheroidal galaxies in the Milky Way halo, which rule out dark matter masses below ∼ 50 GeV (90 GeV), for sterile neutrino masses M N M DM (M N M DM ). We also estimate the impact of AMS-02 anti-proton data on this scenario.

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Implications of the Fermi-LAT Pass 8 Galactic Center excess on supersymmetric dark matter

Abstract: The Fermi Collaboration has recently updated their analysis of gamma rays from 7 See ref.[52] for more information.

Cited by 28 publications

References 96 publications

Status, Challenges and Directions in Indirect Dark Matter Searches

Status, Challenges and Directions in Indirect Dark Matter Searches

Dark matter, extra-terrestrial gamma-rays and the MSSM: a viability study

Probing the sterile neutrino portal to Dark Matter with γ rays

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