On a possible solution to gamma-ray overabundance arising in dark matter explanation of cosmic antiparticle excess

Alekseev, V. V.; Belotsky, K. M.; Bogomolov, Yu. V.; Budaev, R. I.; Dunaeva, O. A.; Кириллов, А. А.; Кузнецов, А. В.; Laletin, Maxim; Lukyanov, A. D.; Malakhov, V.; Mayorov, A. G.; Mayorova, M. A.; Okrugin, A. A.; Rodenko, S. A.; Shitova, A. M.

doi:10.1088/1742-6596/675/1/012026

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…But attempts to explain the positron anomaly with DM face a problem of agreement with data on cosmic gamma-rays (see, e.g., our works [6,7,8] and other [9,10,11,12,13]) and CMB [14] and some other for specific DM model case. Constraint following from CMB can be more easily avoided (see, e.g., the references in [15,16,17]) than that from data on cosmic gamma-ray background [19].…”

Section: Introductionmentioning

confidence: 68%

“…We consider possibility of PA explanation with the help of DM and elaborate two approaches for it: one is connected with space distribution of DM in Galaxy ('Dark disk' model) [6,8,7,9,23,24], other one is connected with possible physics of DM interaction leading to annihilation or decay which can give suppressed FSR [15,16,17]. The latter was attempted to be considered by other recently [25].…”

Section: Introductionmentioning

confidence: 99%

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Consideration of a loop decay of dark matter particle into electron-positron from point of view of possible FSR suppression

Belotsky,

Kamaletdinov

2020

Preprint

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Cosmic positron anomaly is still not explained. Explanation with dark matter (DM) decay or annihilation is one of the main attempts to do it. But they suffer with shortcoming as overproduction of induced gamma-radiation which contradict to cosmic gamma-background. Final state radiation (FSR) in such processes is supposed under standard conditions (by default) to have the basic contribution in it. Our group elaborates possibility to evade this problem in different ways.Here we continue one of them connected with possibility of suppression of FSR due to specifics of Lagrangian describing DM particle decay. Loop through two new spinors and scalar is considered. Effect of FSR suppression is found to be existing but at the very low level in the considered case.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Consideration of a loop decay of dark matter particle into electron-positron from point of view of possible FSR suppression

Belotsky,

Kamaletdinov

2020

Preprint

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“…As we mentioned above, one can try to suppress photon yield due to the interaction Lagrangian of DM particles. Earlier we have shown [9] that the parametrization of the simplest interaction vertices like (3) and (4) does not suppress the photon yield during decays of vector and scalar DM particles into e + e − .…”

Section: On the Suppression Due To Dm/sm Interaction Lagrangianmentioning

confidence: 94%

“…In our works [1][2][3]5,9] we have shown that the DM models explaining the positron anomaly in most cases have major problems with gamma-ray constraints, more specifically, the one set by IGRB data obtained by Fermi-LAT experiment [12]. And therefore, to make these models plausible, one needs to somehow suppress the gamma-ray emission.…”

Section: Maximal Possible Gamma-ray Radiation From Annihilating Dm Momentioning

confidence: 97%

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Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter

et al. 2020

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The observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation via DM particles decays (or annihilation) is connected with gamma-ray background due to gamma overproduction in such processes. In this work, we impose an observational constraint on gamma ray production from DM. Then, we study the possible suppression of gamma yield in the DM decays into identical final fermions. Such DM particles arise in the multi-component dark atom model. The influence of the interaction vertices on the gamma suppression was also considered. No essential gamma suppression effects are found. However, some minor ones are revealed.

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

Belotsky

Budaev

Кириллов

et al. 2017

J. Cosmol. Astropart. Phys.

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A number of papers attempt to explain the positron anomaly in cosmic rays, observed by PAMELA and AMS-02, in terms of dark matter (DM) decays or annihilations. However, the recent progress in cosmic gamma-ray studies challenges these attempts. Indeed, as we show, any rational DM model explaining the positron anomaly abundantly produces final state radiation and Inverse Compton gamma rays, which inevitably leads to a contradiction with Fermi-LAT isotropic diffuse gamma-ray background measurements. Furthermore, the Fermi-LAT observation of Milky Way dwarf satellites, supposed to be rich in DM, revealed no significant signal in gamma rays.We propose a generic approach in which the major contribution to cosmic rays comes from the dark matter disc and prove that the tension between the DM origin of the positron anomaly and the cosmic gamma-ray observations can be relieved. We consider both a simple model, in which DM decay/annihilate into charged leptons, and a model-independent minimal case of particle production, and we estimate the optimal thickness of DM disk. Possible mechanisms of formation and its properties are briefly discussed.

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On a possible solution to gamma-ray overabundance arising in dark matter explanation of cosmic antiparticle excess

Cited by 8 publications

References 7 publications

Consideration of a loop decay of dark matter particle into electron-positron from point of view of possible FSR suppression

Consideration of a loop decay of dark matter particle into electron-positron from point of view of possible FSR suppression

Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter

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

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