On the sensitivity of CTA to gamma-ray boxes from multi-TeV dark matter

Ibarra, Alejandro; Lamperstorfer, Anna S.; López-Gehler, Sergio; Pato, Miguel; Bertone, Gianfranco

doi:10.1088/1475-7516/2015/09/048

Cited by 41 publications

(53 citation statements)

References 119 publications

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“…Such high scale DM mass implies a very small DM number density in the universe, and suppressing any DM event rates such as direct detection and annihilation, making it invisible. In particular, we have checked that even with the largest possible annihilation cross section of the s wave unitarity bound, the most optimistic NFW DM profile and large exposure time assumptions, next generation gamma ray indirect detection experiment such as the CTA still cannot probe/constrain such a high scale DM candidate from the galaxy center, similar to [11].…”

Section: Jhep09(2016)162mentioning

confidence: 99%

A scenario of heavy but visible baryonic dark matter

Huo

Matsumoto

Tsai

et al. 2016

J. High Energ. Phys.

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We consider a model in which dark matter is a composite baryon of a dark sector governed by SU(3) gauge theory, with vector-like quarks also charged under U(1) Y . The model provides simple answer to the dark matter stability problem: it is a result of the accidental dark baryon number conservation. And with an analogy to QCD, all physical quantities of the dark matter can be calculated by rescaling the QCD experimental results. According to the thermal freeze-out mechanism the mass of the dark matter is predicted to be O(100) TeV in order to achieve a correct relic abundance. Such heavy dark matter is in general hard for detection due to small dark matter number density in the universe. However, dark baryon number in our model is not necessarily strictly preserved thanks to operators suppressed by the Planck scale, and such decay operator results in a decay lifetime marginal to the current detection bound. We show our model with O(10 27 ) s dark matter decay life time can explain the AMS-02 anti-proton data, if it is experimentally interpreted as an access, although some theoretical uncertainty may weaken its significance. We also investigate other phenomena of this model such as the extragalactic gamma ray and neutrino signatures.

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Section: Jhep09(2016)162mentioning

confidence: 99%

A scenario of heavy but visible baryonic dark matter

Huo

Matsumoto

Tsai

et al. 2016

J. High Energ. Phys.

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“…Projection studies include: CTA 5h [11] for photon-lines from GC (see refs. [41,42] for similar results), CTA 500h [43,44] for photon-continuum from GC, and Fermi-LAT 15 years for photon-continuum from 16 DG [45] (see ref. [46] for CTA projections).…”

Section: Annihilations At Gc and Dgmentioning

confidence: 62%

Very Degenerate Higgsino Dark Matter

Chun¹,

Jung²,

Park³

2017

J. High Energ. Phys.

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We present a study of the Very Degenerate Higgsino Dark Matter (DM), whose mass splitting between the lightest neutral and charged components is O(1) MeV, much smaller than radiative splitting of 355 MeV. The scenario is realized in the minimal supersymmetric standard model by small gaugino mixings. In contrast to the pure Higgsino DM with the radiative splitting only, various observable signatures with distinct features are induced. First of all, the very small mass splitting makes (a) sizable Sommerfeld enhancement and Ramsauer-Townsend (RT) suppression relevant to ∼1 TeV Higgsino DM, and (b) Sommerfeld-Ramsauer-Townsend effect saturate at lower velocities v/c 10 −3 . As a result, annihilation signals can be large enough to be observed from the galactic center and/or dwarf galaxies, while the relative signal sizes can vary depending on the locations of Sommerfeld peaks and RT dips. In addition, at collider experiments, stable chargino signatures can be searched for to probe the model in the future. DM direct detection signals, however, depend on the Wino mass; even no detectable signals can be induced if the Wino is heavier than about 10 TeV.

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“…The first region is the one used in Ref. [43], while the two other regions are inspired by the Fermi-LAT analysis [64]. The annihilation J-factors for the regions 2x2, R3 and R16 readJ ann = 8.…”

Section: Appendix A: Data Treatmentmentioning

confidence: 99%

Gamma-ray triangles: A possible signature of asymmetric dark matter in indirect searches

et al. 2016

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We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realization of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches.

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On the sensitivity of CTA to gamma-ray boxes from multi-TeV dark matter

Cited by 41 publications

References 119 publications

A scenario of heavy but visible baryonic dark matter

A scenario of heavy but visible baryonic dark matter

Very Degenerate Higgsino Dark Matter

Gamma-ray triangles: A possible signature of asymmetric dark matter in indirect searches

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