Antiprotons from dark matter: Effects of a position-dependent diffusion coefficient

Perelstein, Maxim; Shakya, Bibhushan

doi:10.1103/physrevd.83.123508

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…Several studies have been conducted regarding the antiproton flux originated from dark matter annihilation [98][99][100][101][102][103][104]. Throughout the years no excess has been observed except in [34] where an excess has been spotted using PAMELA data.…”

Section: The Anti-proton Excessmentioning

confidence: 99%

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

2017

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A puzzling excess in gamma-rays at GeV energies has been observed in the center of our galaxy using Fermi-LAT data. Its origin is still unknown, but it is well fitted by Weakly Interacting Massive Particles (WIMPs) annihilations into quarks with a cross section around 10 −26 cm 3 s −1 with masses of 20 − 50 GeV, scenario which is promptly revisited. An excess favoring similar WIMP properties has also been seen in anti-protons with AMS-02 data potentially coming from the Galactic Center as well. In this work, we explore the possibility of fitting these excesses in terms of semi-annihilating dark matter, dubbed as semi-Hooperon, with the process WIMP WIMP → WIMP X being responsible for the gamma-ray excess, where X=h,Z. An interesting feature of semi-annihilations is the change in the relic density prediction compared to the standard case, and the possibility to alleviate stringent limits stemming from direct detection searches. Moreover, we discuss which models might give rise to a successful semi-Hooperon setup in the context of Z3,Z4 and extra "dark" gauge symmetries.

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Section: The Anti-proton Excessmentioning

confidence: 99%

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

2017

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“…Refs. [80,82] treat the antiproton case, for which energy losses are almost irrelevant, which makes it difficult to compare with electrons. On the other hand, Ref.…”

Section: Electron Transport Models For Dm-induced Ic Calculationsmentioning

confidence: 99%

Diffuse gamma-ray constraints on dark matter revisited I: the impact of subhalos

Blanchet¹,

Lavalle²

2012

J. Cosmol. Astropart. Phys.

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We make a detailed analysis of the indirect diffuse gamma-ray signals from dark matter annihilation in the Galaxy. We include the prompt emission, as well as the emission from inverse Compton scattering whenever the annihilation products contain light leptons. We consider both the contribution from the smooth dark matter halo and that from substructures. The main parameters for the latter are the mass function index and the minimal subhalo mass. We use recent results from N-body simulations to set the most reasonable range of parameters, and find that the signal can be boosted by a factor ranging from 2 to 15 towards the Galactic poles, slightly more towards the Galactic anticenter, with an important dependence on the subhalo mass index. This uncertainty is however much less than that of the extragalactic signal studied in the literature. We derive upper bounds on the dark matter annihilation cross section using the isotropic gamma-ray emission measured by Fermi-LAT, for two directions in the sky, the Galactic anticenter and the Galactic pole(s). The former represents the lowest irreducible signal from dark matter annihilation, and the latter is robust as the astrophysical background, dominated by the hadronic contribution, is rather well established in that direction. Finally, we show how the knowledge of the minimal subhalo mass, which formally depends on the dark matter particle interactions with normal matter, can be used to derive the mass function index.

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“…It should be noted that a 130 GeV dark matter particle annihilating into Ws is also in tension with PAMELA antiproton constraints (see e.g. [14], [15]) and observation of dwarf galaxies ( [16]; also see [17] for related uncertainties with dwarf galaxies).…”

Section: Neutralino Dark Matter and Internal Bremsstrahlungmentioning

confidence: 94%

A 130 GeV gamma ray signal from supersymmetry

Shakya

2013

Physics of the Dark Universe

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The viability of neutralino dark matter as an explanation of the 130 GeV gamma ray signal from the Galactic Center recently observed by the Fermi Large Area Telescope is examined. It is found that the signal can be compatible with a sharp feature from internal bremsstrahlung from a mostly bino dark matter particle of mass around 145 GeV, augmented by a contribution from annihilation into gamma+Z via a small wino admixture. This scenario circumvents the problematic overproduction of lower energy continuum photons that plague line interpretations of this signal. Sleptons approximately degenerate in mass with the neutralino are required to enhance the internal bremsstrahlung feature.

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Antiprotons from dark matter: Effects of a position-dependent diffusion coefficient

Cited by 13 publications

References 28 publications

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

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

Diffuse gamma-ray constraints on dark matter revisited I: the impact of subhalos

A 130 GeV gamma ray signal from supersymmetry

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