scholarly journals Direct Measurement of the Cosmic-Ray Iron Spectrum with the Dark Matter Particle Explorer

2021 ◽  
Author(s):  
ZhiHui Xu ◽  
Cai ◽  
Chang ◽  
Hu ◽  
Jiang ◽  
...  
Keyword(s):  
Dark Matter ◽  
Direct Measurement ◽  
Dark Matter Particle ◽  
Cosmic Ray

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 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

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

scholarly journals Helium flux and elemental composition of galactic Cosmic Rays with the DAMPE space mission

2019 ◽  
Vol 209 ◽  
pp. 01041
Author(s):  
Margherita Di Santo
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Gamma Ray ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
High Energy ◽  
Space Mission ◽  
Galactic Cosmic Rays ◽  
Gobi Desert ◽  
Photon Spectra

DAMPE (DArk Matter Particle Explorer) is a space mission project promoted by the Chinese Academy of Sciences (CAS), in collaboration with Universities and Institutes from China, Italy and Switzerland. The detector is collecting data in a stable sun-synchronous orbit lasting 95 minutes at an altitude of about 500 km. It has been launched in December 17th, 2015, from the Jiuquan Satellite Launch Center, in the Gobi Desert. The main goals of the mission are: indirect search for Dark Matter, looking for signatures in the electron and photon spectra with energies up to 10 TeV; analysis of the flux and composition of primary Cosmic Rays with energies up to hundreds of TeV; high energy gamma-ray astronomy. Preliminary results about the Helium flux and Cosmic Ray composition will be presented and discussed.

scholarly journals DAMPE excess from decaying right-handed neutrino dark matter

2018 ◽  
Vol 33 (27) ◽  
pp. 1850157 ◽  
Author(s):  
Nobuchika Okada ◽  
Osamu Seto
Keyword(s):  
Dark Matter ◽  
Mass Formula ◽  
Hadron Collider ◽  
Planck Scale ◽  
Gauge Coupling ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
High Energy ◽  
Boson Mass ◽  
Late Time

The flux of high-energy cosmic-ray electrons plus positrons recently measured by the DArk Matter Particle Explorer (DAMPE) exhibits a tentative peak excess at an energy of around 1.4 TeV. In this paper, we consider the minimal gauged U(1)[Formula: see text] model with a right-handed neutrino (RHN) dark matter (DM) and interpret the DAMPE peak with a late-time decay of the RHN DM into [Formula: see text]. We find that a DM lifetime [Formula: see text] can fit the DAMPE peak with a DM mass [Formula: see text]. This favored lifetime is close to the current bound on it by Fermi-LAT, our decaying RHN DM can be tested, once the measurement of cosmic gamma ray flux is improved. The RHN DM communicates with the Standard Model particles through the U(1)[Formula: see text] gauge boson ([Formula: see text] boson), and its thermal relic abundance is controlled by only three free parameters: [Formula: see text], the U(1)[Formula: see text] gauge coupling [Formula: see text], and the [Formula: see text] boson mass [Formula: see text]. For [Formula: see text], the rest of the parameters are restricted to be [Formula: see text] and [Formula: see text], in order to reproduce the observed DM relic density and to avoid the Landau pole for running [Formula: see text] below the Planck scale. This allowed region will be tested by the search for a [Formula: see text] boson resonance at the future Large Hadron Collider.

Sign in / Sign up

Export Citation Format

Share Document