Fermi-LAT kills dark matter interpretations of AMS-02 data. Or not?

Belotsky, K. M.; Budaev, R. I.; Кириллов, А. А.; Laletin, Maxim

doi:10.1088/1475-7516/2017/01/021

Cited by 30 publications

(40 citation statements)

References 50 publications

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“…And it has been shown (see Fig. 1), that decaying or annihilating DM distributed in halo produces too many gammas, leading to contradiction with IGRB data [16].…”

Section: Positron Anomaly Of Pamela and Ams-02mentioning

confidence: 96%

“…• Modifications of the two above with extra quark-antiquark channel included. Figure 3: Contour plot for χ 2 /N dof in dependence of disk half-width and mass of DM particle from [16]. Implementation of the dark disk model greatly reduces the contradiction with IGRB data (see Fig.…”

Section: Dark Disk Modelmentioning

confidence: 99%

“…In our works [16,[34][35][36][37][38], we have used this fact to propose the so-called "dark disk model" for description the positron anomaly in AMS-02 data. We consider the Dark Matter to consist of two components.…”

Section: Dark Disk Modelmentioning

confidence: 99%

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Indirect effects of dark matter

Belotskiy

Esipova

Kamaletdinov

et al. 2019

Int. J. Mod. Phys. D

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Here we briefly review possible indirect effects of dark matter (DM) of the Universe. It includes effects in cosmic rays (CR): first of all, the positron excess at ∼ 500 GeV and possible electron-positron excess at 1-1.5 TeV. We tell that the main and least model-dependent constraint on such possible interpretation of CR effects goes from gamma-ray background. Even ordinary e + e − mode of DM decay or annihilation produces prompt photons (FSR) so much that it leads to contradiction with data on cosmic gamma-rays. We present our attempts to possibly avoid gamma-ray constraint. They concern peculiarities of both space distribution of DM and their physics. The latter involves complications of decay/annihilation modes of DM, modifications of Lagrangian of DM-ordinary matter interaction, and inclusion of mode with identical fermions in final state. In this way, no possibilities to suppress were found yet except, possibly, mode with identical fermions. While the case of spatial distribution variation allows achieving consistency between different data. Also we consider stable form of dark matter which can interact with baryons. We show which constraint such DM candidate can get from damping effect in plasma during large scale structure formation in comparison with other existing constraints.

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“…And it has been shown (see Fig. 1), that decaying or annihilating DM distributed in halo produces too many gammas, leading to contradiction with IGRB data [16].…”

Section: Positron Anomaly Of Pamela and Ams-02mentioning

confidence: 96%

Section: Dark Disk Modelmentioning

confidence: 99%

See 1 more Smart Citation

Indirect effects of dark matter

Belotskiy

Esipova

Kamaletdinov

et al. 2019

Int. J. Mod. Phys. D

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“…Also the shape of the DM halo may influence the charged CR (e + , e − ) and γ-ray flux. The γ-ray flux measured at higher latitudes may be reduced and the charged CR flux enhanced if the DM accumulates close to galactic plane, as in the "Dark-Disc" model [16] for partly self-interacting DM.…”

Section: Pos(icrc2017)919mentioning

confidence: 97%

Searching for Cosmic-Ray Signals from Decay of Fermionic Dark Matter with CALET

Bhattacharyya¹,

Motz²,

Torii³

et al. 2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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The ISS-based CALET detector which is in operation since October 2015, can play an important role in indirect search of Dark Matter by measuring the electron + positron cosmic-ray spectrum in the TeV region for the first time directly. With its fine energy resolution (∼ 2%) and high proton rejection ratio (1 : 10 5 ), CALET has a capability to detect fine structures in (e + + e − ) spectrum. In this work, we have investigated CALET's potential to discern between Dark Matter decay and nearby pulsars as the origin of the Cosmic Ray positron excess observed by PAMELA or AMS-02. A parametrization of the propagated electron and positron spectra is fitted to the existing measurements, where either 3-body decay of Fermionic Dark Matter or pulsar assumed responsible for the positron excess. Expected CALET data for Dark Matter decay models which can explain the positron excess are calculated and analyzed. The signal from a particular 3-body Dark Matter decay, which can explain the measurements from the AMS-02 experiment, is shown to be distinguishable from a single pulsar source by observing (e + + e − ) spectrum with CALET. We show that an especially clear separation of the pulsar model is possible from the Dark Matter model for which the diffuse γ-ray flux is possibly compatible with the Fermi-LAT data.

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“…Eventually, this wave essentially crashed against multiple constraints, mostly concerning the emission of gamma rays, associated with the production of high-energy positrons (see e.g. [16][17][18][19][20]; also see Section 4). The exact origin of the positron anomaly is yet to be determined, though it appears that more attention is drawn towards the surrounding pulsars as a source of the major part of these positrons.…”

Section: Introductionmentioning

confidence: 99%

The DAMPE excess and gamma-ray constraints

Belotsky

Kamaletdinov

Laletin

et al. 2019

Physics of the Dark Universe

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The direct measurements of the cosmic electron-positron spectrum around 1 TeV made by DAMPE have induced many theoretical speculations about possible excesses in the data above the standard astrophysical predictions that might have the dark matter (DM) origin. These attempts mainly fall into two categories: i) DM annihilations (or decays) in the Galactic halo producing the broad spectrum excess; ii) DM annihilations in the nearby compact subhalo producing the sharp peak at 1.4 TeV. We investigate the gamma-ray emission accompanying e + e − production in DM annihilations, as well as various theoretical means to suppress the prompt radiation, such as specific interaction vertices or multi-cascade modes, and conclude that these attempts are in tension with various gamma-ray observations. We show that the DM explanations of the broad spectrum excess tend to contradict the diffuse isotropic gamma-ray background (IGRB), measured by Fermi-LAT, while the nearby subhalo scenario is constrained by nonobservation in the surveys, performed by Fermi-LAT, MAGIC and HESS. We also briefly review other types of gamma-ray constraints, which seem to rule out the DM interpretations of the DAMPE broad spectrum excess as well.

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Fermi-LAT kills dark matter interpretations of AMS-02 data. Or not?

Cited by 30 publications

References 50 publications

Indirect effects of dark matter

Indirect effects of dark matter

Searching for Cosmic-Ray Signals from Decay of Fermionic Dark Matter with CALET

The DAMPE excess and gamma-ray constraints

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