scholarly journals Neutrino signals from annihilating/decaying dark matter in the light of recent measurements of cosmic ray electron/positron fluxes

2009 ◽  
Vol 79 (4) ◽  
Author(s):  
Junji Hisano ◽  
Masahiro Kawasaki ◽  
Kazunori Kohri ◽  
Kazunori Nakayama
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Electron Positron ◽  
Decaying Dark Matter

scholarly journals ELECTRON/POSITRON EXCESSES IN THE COSMIC RAY SPECTRUM AND POSSIBLE INTERPRETATIONS

2010 ◽  
Vol 19 (13) ◽  
pp. 2011-2058 ◽  
Author(s):  
YI-ZHONG FAN ◽  
BING ZHANG ◽  
JIN CHANG
Keyword(s):  
Dark Matter ◽  
Supernova Remnant ◽  
Cosmic Ray ◽  
Theoretical Models ◽  
New Physics ◽  
Observational Constraints ◽  
Correct Interpretation ◽  
Observational Feature ◽  
Electron Positron ◽  
Observational Status

The data collected by ATIC, PPB-BETS, FERMI-LAT and HESS all indicate that there is an electron/positron excess in the cosmic ray energy spectrum above ~100 GeV, although different instrumental teams do not agree on the detailed spectral shape. PAMELA also reported clearly the excessive feature of the fraction of positron above several GeV, but with no excess in antiprotons. Here we review the observational status and theoretical models of this interesting observational feature. We pay special attention to various physical interpretations proposed in the literature, including modified supernova remnant models for the e± background, new astrophysical sources, and new physics (the dark matter models). We suggest that although most models can make a case to interpret the data, with the current observational constraints the dark matter interpretations, especially those invoking annihilation, require much more exotic assumptions than some other astrophysical interpretations. Future observations may present some "smoking-gun" observational tests to differentiate different models and to identify the correct interpretation of the phenomenon.

scholarly journals Cosmic ray excesses from multi-component dark matter decays

2014 ◽  
Vol 29 (37) ◽  
pp. 1440003 ◽  
Author(s):  
Chao-Qiang Geng ◽  
Da Huang ◽  
Lu-Hsing Tsai
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Parameter Range ◽  
Decay Channels ◽  
Positron Fraction ◽  
Flavor Structure ◽  
Two Component ◽  
Decaying Dark Matter ◽  
Interesting Variation ◽  
Γ Ray

We use multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction recently confirmed by AMS-02 and the total e+ +e- flux observed by Fermi-LAT. In the two-component DM models, we find an interesting variation of the flavor structure along with the cutoff of the heavy DM. For the three-component DM case, we focus on a particular parameter range in which the best fits prefer to open only two DM decay channels with a third DM contributing nothing to the electron and positron spectra. We show that all models give the reasonable fits to both the AMS-02 positron fraction and the Fermi-LAT total e++e- flux, which are also consistent with the measured diffuse γ-ray flux by Fermi-LAT.

scholarly journals An interpretation of the cosmic ray e+ + e− spectrum from 10GeV to 3TeV measured by CALET on the ISS

2019 ◽  
Vol 28 (02) ◽  
pp. 1950035 ◽  
Author(s):  
Saptashwa Bhattacharyya ◽  
Holger Motz ◽  
Yoichi Asaoka ◽  
Shoji Torii
Keyword(s):  
Dark Matter ◽  
Electron Flux ◽  
Simulated Data ◽  
Flux Measurement ◽  
Cosmic Ray ◽  
Electron Positron ◽  
Positron Spectrum ◽  
Extra Electron ◽  
Electron Positron Pair ◽  
Combined Measurements

A combined interpretation of the Calorimetric Electron Telescope (CALET) [Formula: see text] spectrum up to 3[Formula: see text]TeV and the AMS-02 positron spectrum up to 500[Formula: see text]GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cutoff for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter (DM) as the extra electron–positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both DM decay and the pulsar model can explain the combined measurements. While the DM decay scenario is constrained by the Fermi-LAT [Formula: see text]-ray measurement, we show that 3-body decay of a 800[Formula: see text]GeV DM can be compatible with the [Formula: see text]-ray flux measurement. We discuss the capability of CALET to discern decaying DM models from a generic pulsar source scenario, based on simulated data for five years of data-taking.

Multi-component dark matter

2015 ◽  
Vol 30 (28n29) ◽  
pp. 1545009 ◽  
Author(s):  
Chao-Qiang Geng ◽  
Da Huang ◽  
Chang Lai
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
High Energy ◽  
Flux Data ◽  
Positron Fraction ◽  
High Energy Behavior ◽  
Energy Behavior ◽  
Two Component ◽  
Decaying Dark Matter

We review the multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction, the positron and electron respective fluxes, and the total [Formula: see text] flux observed by AMS-02. We show that the two-component DM model can fit the AMS-02 datasets. In particular, we demonstrate that the heavier DM component with its mass around 1 TeV dominantly decaying through the [Formula: see text] and [Formula: see text]-channels describes the high-energy behavior of the total [Formula: see text] flux data above 500 GeV, while the lighter one of O(100) GeV mainly through the [Formula: see text]-channel explains the substructure around 100 GeV.

scholarly journals Indirect searches for dark matter with the Fermi LAT instrument

2014 ◽  
Vol 29 (22) ◽  
pp. 1430030 ◽  
Author(s):  
M. N. Mazziotta ◽  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Weakly Interacting Massive Particles ◽  
Current Status ◽  
Large Area ◽  
Weakly Interacting ◽  
Electron Positron ◽  
Massive Particles ◽  
Particle Dark Matter

In this review the current status of several searches for particle dark matter with the Fermi Large Area Telescope instrument is presented. In particular, the current limits on the weakly interacting massive particles, obtained from the analyses of gamma-ray and cosmic ray electron/positron data, will be illustrated.

V-PARTICLE AGAIN?

2011 ◽  
Vol 20 (08) ◽  
pp. 1399-1412 ◽  
Author(s):  
SHOU-HUA ZHU
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Strange Particle ◽  
High Energy ◽  
Neutrino Telescope ◽  
Decay Length ◽  
Atmospheric Neutrinos ◽  
Numerical Estimation ◽  
Dark Sector ◽  
Electron Positron

This talk is mainly based on our previous work.1 We will investigate the possibility of detecting light long-lived particle (LLP) produced by high energy cosmic ray colliding with atmosphere. The LLP may penetrate the atmosphere and decay into a pair of muons near/in the neutrino telescope. Such muons can be treated as the detectable signal for neutrino telescope. The particle with such behavior is very similar with that of the first observed strange particle in cosmic ray events, which was coined historically as "V-particle" in some literature. This study is motivated by recent cosmic electron/positron observations which suggest the existence of O(TeV) dark matter and new light O(GeV) particle. It indicates that dark sector may be complicated, and there may exist more than one light particle, for example the dark gauge boson A′ and associated dark Higgs boson h′. In this work, we discuss the scenario with A′ heavier than h′ and h′ is treated as LLP. Based on our numerical estimation, we find that the large volume neutrino telescope IceCube has the capacity to observe several tens of di-muon events per year for favorable parameters if the decay length of LLP can be comparable with the depth of atmosphere. The challenge here is how to suppress the muon background induced by cosmic rays and atmospheric neutrinos.

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

2020 ◽  
Vol 2020 (04) ◽  
pp. 031-031
Author(s):  
Lei Feng ◽  
Zhaofeng Kang ◽  
Qiang Yuan ◽  
Peng-Fei Yin ◽  
Yi-Zhong Fan
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Decaying Dark Matter

scholarly journals Constraining the annihilation of dark matter via cosmic-ray positrons and electrons

2021 ◽  
Vol 2145 (1) ◽  
pp. 012007
Author(s):  
Suwitchaya Setthahirun ◽  
Maneenate Wechakama
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Observational Data ◽  
Cross Section ◽  
Source Function ◽  
Cosmic Ray ◽  
Electron Channel ◽  
Diffusion Loss ◽  
Electron Positron ◽  
Positron Spectrum

Abstract We aim to constrain the properties of dark matter particles by several measurements of positrons and electrons from cosmic-rays. We assume that collisions of dark matter particles and dark matter anti-particles can produce positrons and electrons. The electron-positron propagation is explained by a diffusion-loss equation including loss rates, diffusion, as well as source function. We use data of cosmic-ray positrons and electrons detected by PAMELA, H.E.S.S., AMS-02 and Fermi-LAT. We compare the observational data with the electron and positron spectrum from five annihilation channels in our model to derive constraining factors regarding the cross-section of the annihilation of dark matter. The tightest constraint is provided by cosmic-ray positrons of AMS-02 for the electron channel. Dark matter with mass below a few GeV gets excluded by the cosmic-ray positrons of AMS-02 for the electron, muon and tau channels.

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