scholarly journals Observations of Forbush Decreases of Cosmic-Ray Electrons and Positrons with the Dark Matter Particle Explorer

2021 ◽  
Vol 920 (2) ◽  
pp. L43
Author(s):  
Francesca Alemanno ◽  
Qi An ◽  
Philipp Azzarello ◽  
Felicia Carla Tiziana Barbato ◽  
Paolo Bernardini ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Forbush Decreases ◽  
Electrons And Positrons

An excess radio signal in the Abell 4038 cluster

2020 ◽  
Vol 500 (4) ◽  
pp. 5583-5588
Author(s):  
Man Ho Chan ◽  
Chak Man Lee
Keyword(s):  
Dark Matter ◽  
Spectral Data ◽  
Cross Section ◽  
Radio Signal ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Annihilation Cross Section ◽  
Radio Continuum ◽  
Test Statistic ◽  
Dark Matter Annihilation

ABSTRACT In the past decade, various instruments, such as the Large Area Telescope (LAT) on the Fermi Gamma Ray Space Telescope, the Alpha Magnetic Spectrometer (AMS) and the Dark Matter Particle Explorer(DAMPE), have been used to detect the signals of annihilating dark matter in our Galaxy. Although some excesses of gamma rays, antiprotons and electrons/positrons have been reported and are claimed to be dark matter signals, the uncertainties of the contributions of Galactic pulsars are still too large to confirm the claims. In this paper, we report on a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming a thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we obtain very large test statistic (TS) values, TS > 45, for four popular annihilation channels, which correspond to more than 6σ statistical preference. This reveals a possible potential signal of annihilating dark matter. In particular, our results are also consistent with the recent claims of dark matter mass, m ≈ 30–50 GeV, annihilating via the $\rm b\bar{b}$ quark channel with the thermal annihilation cross-section. However, at this time, we cannot exclude the possibility that a better background cosmic ray model could explain the spectral data without recourse to dark matter annihilations.

scholarly journals A possible radio signal of annihilating dark matter in the Abell 4038 cluster

2019 ◽  
Vol 495 (1) ◽  
pp. L124-L128 ◽  
Author(s):  
Man Ho Chan ◽  
Chak Man Lee
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Radio Signal ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Annihilation Cross Section ◽  
Radio Continuum ◽  
Test Statistic ◽  
Large Area ◽  
Dark Matter Annihilation

ABSTRACT In the past decade, some telescopes [e.g. Fermi-Large Area Telescope (LAT), Alpha Magnetic Spectrometer(AMS), and Dark Matter Particle Explorer(DAMPE)] were launched to detect the signals of annihilating dark matter in our Galaxy. Although some excess of gamma-rays, antiprotons, and electrons/positrons have been reported and claimed as dark matter signals, the uncertainties of Galactic pulsars’ contributions are still too large to confirm the claims. In this Letter, we report a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming the thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we get very large test statistic values >45 for four popular annihilation channels, which correspond to more than 6.5σ statistical preference. This provides a very strong evidence for the existence of annihilating dark matter. In particular, our results also support the recent claims of dark matter mass m ≈ 30–50 GeV annihilating via the bb̄ quark channel with the thermal annihilation cross-section.

scholarly journals Measurement of cosmic ray proton spectrum with the Dark Matter Particle Explorer

2019 ◽  
Author(s):  
Chuan Yue ◽  
Antonio De Benedittis ◽  
Mario Nicola Mazziotta ◽  
Stefania Vitillo ◽  
Zhi-Hui Xu ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Proton Spectrum

scholarly journals Observation of time evolution of cosmic ray electron and positron flux with Dark Matter Particle Explorer

2019 ◽  
Author(s):  
Jingjing Zang ◽  
Yang Liu ◽  
Qiang Yuan ◽  
Chuan Yue ◽  
Keyword(s):  
Dark Matter ◽  
Time Evolution ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Positron Flux

scholarly journals Remnants of Galactic Subhalos and Their Impact on Indirect Dark-Matter Searches

Galaxies ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 65 ◽  
Author(s):  
Martin Stref ◽  
Thomas Lacroix ◽  
Julien Lavalle
Keyword(s):  
Dark Matter ◽  
Computer Simulations ◽  
Gamma Rays ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Tidal Disruption ◽  
Large Numbers ◽  
Boost Factor

Dark-matter subhalos, predicted in large numbers in the cold-dark-matter scenario, should have an impact on dark-matter-particle searches. Recent results show that tidal disruption of these objects in computer simulations is overefficient due to numerical artifacts and resolution effects. Accounting for these results, we re-estimated the subhalo abundance in the Milky Way using semianalytical techniques. In particular, we showed that the boost factor for gamma rays and cosmic-ray antiprotons is increased by roughly a factor of two.

scholarly journals Perspectives for indirect dark matter search with AMS-2 using cosmic-ray electrons and positrons

2009 ◽  
Vol 11 (10) ◽  
pp. 105021 ◽  
Author(s):  
B Beischer ◽  
P von Doetinchem ◽  
H Gast ◽  
T Kirn ◽  
S Schael
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Dark Matter Search ◽  
Electrons And Positrons

scholarly journals Search for dark matter cosmic-ray electrons and positrons from the Sun with the Fermi Large Area Telescope

2020 ◽  
Vol 101 (2) ◽  
Author(s):  
A. Cuoco ◽  
P. De La Torre Luque ◽  
F. Gargano ◽  
M. Gustafsson ◽  
F. Loparco ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
The Sun ◽  
Large Area ◽  
Electrons And Positrons

Dark matter particle explorer and nearby cosmic ray electron source

2015 ◽  
Vol 45 (11) ◽  
pp. 119510-119510 ◽  
Author(s):  
Lei FENG ◽  
YiZhong FAN ◽  
JianHua GUO ◽  
Jin CHANG
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Electron Source
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