scholarly journals Morphology of the Galactic dark matter synchrotron emission with self-consistent cosmic-ray diffusion models

2010 ◽  
Vol 82 (6) ◽  
Author(s):  
Tim Linden ◽  
Stefano Profumo ◽  
Brandon Anderson
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Diffusion Models ◽  
Synchrotron Emission ◽  
Self Consistent ◽  
Galactic Dark Matter ◽  
Ray Diffusion

scholarly journals NEUTRINO EMISSION FROM DARK MATTER ANNIHILATION/DECAY IN LIGHT OF COSMIC e± AND $\bar{p}$ DATA

2012 ◽  
Vol 27 (06) ◽  
pp. 1250024 ◽  
Author(s):  
JIE LIU ◽  
QIANG YUAN ◽  
XIAOJUN BI ◽  
HONG LI ◽  
XINMIN ZHANG
Keyword(s):  
Dark Matter ◽  
Branching Ratio ◽  
Cosmic Ray ◽  
Current Data ◽  
Neutrino Emission ◽  
Dark Matter Annihilation ◽  
Text Data ◽  
Self Consistent ◽  
Γ Rays ◽  
Global Fitting

A self-consistent global fitting method based on the Markov Chain Monte Carlo technique to study the dark matter (DM) property associated with the cosmic ray electron/positron excesses was developed in our previous work. In this work we further improve the previous study to include the hadronic branching ratio of DM annihilation/decay. The PAMELA [Formula: see text] data are employed to constrain the hadronic branching ratio. We find that the 95% (2σ) upper limits of the quark branching ratio allowed by the PAMELA [Formula: see text] data is ~0.032 for DM annihilation and ~0.044 for DM decay, respectively. This result shows that the DM coupling to pure leptons is indeed favored by the current data. Based on the global fitting results, we further study the neutrino emission from DM in the galactic center. Our predicted neutrino flux is some smaller than previous works since the constraint from γ-rays is involved. However, it is still capable to be detected by the forthcoming neutrino detector such as IceCube. The improved points of the present study compared with previous works include: (1) the DM parameters, both the particle physical ones and astrophysical ones, are derived in a global fitting way, (2) constraints from various species of data sets, including γ-rays and antiprotons are included, and (3) the expectation of neutrino emission is fully self-consistent.

scholarly journals Present and future status of light dark matter models from cosmic-ray electron upscattering

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
James B. Dent ◽  
Bhaskar Dutta ◽  
Jayden L. Newstead ◽  
Ian M. Shoemaker ◽  
Natalia Tapia Arellano
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Future Status

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 Cosmic-Ray Signatures of Dark Matter Decay

2010 ◽  
Author(s):  
David Tran ◽  
George Alverson ◽  
Pran Nath ◽  
Brent Nelson
Keyword(s):  
Dark Matter ◽  
Cosmic Ray

scholarly journals Constraints on Dark Matter Annihilation by Synchrotron Emission based on Planck Data

2017 ◽  
Vol 901 ◽  
pp. 012019
Author(s):  
Chalit Muanglay ◽  
Maneenate Wechakama ◽  
Brandon K. Cantlay
Keyword(s):  
Dark Matter ◽  
Synchrotron Emission ◽  
Dark Matter Annihilation ◽  
Planck Data

Searching for signatures of dark matter in the cosmic ray spectrum measured by AMS-01

2011 ◽  
Vol 221 ◽  
pp. 335
Author(s):  
G. Carosi ◽  
S. Xiao ◽  
P. Fisher ◽  
G. Rybka ◽  
F. Zhou
Keyword(s):  
Dark Matter ◽  
Cosmic Ray

The Cosmic‐Ray Diffusion Tensor in Nonaxisymmetric Turbulence

2008 ◽  
Vol 677 (1) ◽  
pp. 671-675 ◽  
Author(s):  
B. Weinhorst ◽  
A. Shalchi ◽  
H. Fichtner
Keyword(s):  
Diffusion Tensor ◽  
Cosmic Ray ◽  
Ray Diffusion
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