Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

Liu, Feng; Kang, Zhaofeng; Yuan, Qiang; Yin, Peng-Fei; Fan, Yi‐Zhong

doi:10.1088/1475-7516/2020/04/031

Cited by 7 publications

(4 citation statements)

References 137 publications

(150 reference statements)

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“…Thus, the observed rise of the positron fraction has been either attributed to annihilating/decaying dark matter particles (e.g. Yin et al 2009;Cholis & Hooper 2013;Feng et al 2020), or local astrophysical sources such as pulsars or SNe (e.g. Serpico 2012; Di Hooper et al 2009;Mertsch et al 2020).…”

Section: Positron Ratiomentioning

confidence: 99%

Cosmic rays and non-thermal emission in simulated galaxies. I. Electron and proton spectra compared to Voyager-1 data

Werhahn,

Pfrommer,

Girichidis

et al. 2021

Preprint

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Current-day cosmic ray (CR) propagation studies use static Milky-Way models and fit parametrized source distributions to data. Instead, we use three-dimensional magneto-hydrodynamical (MHD) simulations of isolated galaxies with the moving-mesh code A that self-consistently accounts for hydrodynamic effects of CR protons. In post-processing, we calculate their steady-state spectra, taking into account all relevant loss processes. We show that this steady-state assumption is well justified in the disc and generally for regions that emit non-thermal radio and gamma rays. Additionally, we model the spectra of primary electrons, accelerated by supernova remnants, and secondary electrons and positrons produced in hadronic CR proton interactions with the gas. We find that proton spectra above 10 GeV only weakly depend on galactic radius, while they acquire a radial dependence at lower energies due to Coulomb interactions. Radiative losses steepen the spectra of primary CR electrons in the central galactic regions while diffusive losses dominate in the outskirts. Secondary electrons exhibit a steeper spectrum than primaries because they originate from the transported steeper CR proton spectra. Consistent with Voyager-1 and AMS-02 data, our models (i) show a turn-over of proton spectra below GeV energies due to Coulomb interactions so that electrons start to dominate the total particle spectra and (ii) match the shape of the positron fraction up to 10 GeV. We conclude that our steady-state CR modeling in MHD-CR galaxy simulations is sufficiently realistic to capture the dominant transport effects shaping their spectra, arguing for a full MHD treatment to accurately model CR transport in the future.

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Section: Positron Ratiomentioning

confidence: 99%

Cosmic rays and non-thermal emission in simulated galaxies. I. Electron and proton spectra compared to Voyager-1 data

Werhahn,

Pfrommer,

Girichidis

et al. 2021

Preprint

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“…The CRs with energies above 1 TeV usually come from distances within 1 kpc from the solar system, highlighting the importance of nearby sources as detection targets. The energy spectra of CRs may be influenced by nearby sources such as pulsar wind nebulae (PWNe) [6][7][8][9][10][11][12], supernova remnants (SNRs) [6,[13][14][15][16][17][18], and dark matter (DM) particle annihilation or decay [19][20][21][22][23][24][25]. A commonly accepted idea is that the detected spectrum should be a combination of contributions originating from background and local SNR sources.…”

Section: Introductionmentioning

confidence: 99%

Research on electron and positron spectrum in the high-energy region based on the gluon condensation model

Wu,

Feng,

Ruan

2023

J. Cosmol. Astropart. Phys.

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Electron (positron), proton and nuclei can be accelerated to very high energy by local supernova remnants (SNR). The famous excesses of electron and proton (nuclei) potentially come from such kind of local sources. Recently, the DAMPE experiment measured the electron spectrum (including both electrons and positrons) of cosmic rays with high-accuracy. It provides an opportunity to further explore the excess of electrons. According to the gluon condensation (GC) theory, once GC occurs, huge number of gluons condense at a critical momentum, and the production spectra of electron and proton showing typical GC characteristics. There are exact correlations between the electron and proton spectrum from a same GC process. It is possible to interpret the power-law break of cosmic rays in view of GC phenomenon, and predict one from another based on the relations between electron and proton spectrum. In this work, we point out the potential existence of a second excess in the electron spectrum, the characteristics of this excess is derived from experimental data of proton. We hope that the future DAMPE experiments will confirm the existence of this second excess and support the result of GC model.

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“…The most convincing explanation to this 1.5 TeV excess is based on the assumption that the excess peak is due to DM annihilation (and/or decays) in nearby sub-halo enriched with DM. Various studies have been extensively performed to explain the mentioned electron/position excesses and the possible flavor composition of DM annihilation final states [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Confronting cosmic ray electron and positron excesses with hybrid triplet Higgs portal dark matter

Chen,

Banik,

Liu

2021

Preprint

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We perform a detailed study of scalar dark matter with triplet Higgs extensions of the Standard Model in order to explain the cosmic ray electron and positron excesses reported by AMS-02 and DAMPE. A detailed analysis of AMS-02 positron excess reveals that for different orderings (normal, inverted and quasi-degenerate) of neutrino mass, the hybrid triplet Higgs portal framework is more favored with respect to the single triplet Higgs portal for TeV scale dark matter. We also show that the resonant peak and continuous excess in DAMPE cosmic ray data can be well explained with the hybrid triplet Higgs portal dark matter when a dark matter sub-halo nearby is taken into account.

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Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

Cited by 7 publications

References 137 publications

Cosmic rays and non-thermal emission in simulated galaxies. I. Electron and proton spectra compared to Voyager-1 data

Cosmic rays and non-thermal emission in simulated galaxies. I. Electron and proton spectra compared to Voyager-1 data

Research on electron and positron spectrum in the high-energy region based on the gluon condensation model

Confronting cosmic ray electron and positron excesses with hybrid triplet Higgs portal dark matter

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