scholarly journals Searches for particle dark matter with gamma-rays

2012 ◽  
Author(s):  
Jan Conrad
Keyword(s):  
Dark Matter ◽  
Gamma Rays ◽  
Particle Dark Matter

A BRIEF NOTE ON MEV DARK MATTER

2005 ◽  
Vol 14 (04) ◽  
pp. 631-633
Author(s):  
B. G. SIDHARTH
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gamma Rays ◽  
Cross Sections ◽  
Particle Physics ◽  
Galactic Bulge ◽  
Low Mass ◽  
Particle Dark Matter ◽  
Extremal Black Holes

Recently, Boehm and co-workers have analyzed the newly detected 511 keV gamma rays from the galactic bulge based on data obtained from INTEGRAL. They conclude that these gamma rays are a consequence of low mass (~ MeV ) particle dark matter annihilations. Their conclusions are consistent with the halo profile favored by the observations, the annihilation cross-sections required for the radiation and also other astro particle physics constraints.1,2 It may be pointed out that exactly such a production of gamma rays from MeV particles was predicted by the author3 some years ago. This was based on a consideration of extremal black holes. We would like to point out that there is a spectrum of possible candidates.

scholarly journals On a Possible Origin of the Gamma-ray Excess around the Galactic Center

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1432
Author(s):  
Dmitry O. Chernyshov ◽  
Andrei E. Egorov ◽  
Vladimir A. Dogiel ◽  
Alexei V. Ivlev
Keyword(s):  
Dark Matter ◽  
Gamma Rays ◽  
Molecular Clouds ◽  
Alternative Explanation ◽  
Gamma Ray ◽  
Galactic Center ◽  
The Self ◽  
Large Area ◽  
Mhd Turbulence ◽  
The Standard Model

Recent observations of gamma rays with the Fermi Large Area Telescope (LAT) in the direction of the inner galaxy revealed a mysterious excess of GeV. Its intensity is significantly above predictions of the standard model of cosmic rays (CRs) generation and propagation with a peak in the spectrum around a few GeV. Popular interpretations of this excess are that it is due to either spherically distributed annihilating dark matter (DM) or an abnormal population of millisecond pulsars. We suggest an alternative explanation of the excess through the CR interactions with molecular clouds in the Galactic Center (GC) region. We assumed that the excess could be imitated by the emission of molecular clouds with depleted density of CRs with energies below ∼10 GeV inside. A novelty of our work is in detailed elaboration of the depletion mechanism of CRs with the mentioned energies through the “barrier” near the cloud edge formed by the self-excited MHD turbulence. This depletion of CRs inside the clouds may be a reason for the deficit of gamma rays from the Central Molecular Zone (CMZ) at energies below a few GeV. This in turn changes the ratio between various emission components at those energies and may potentially absorb the GeV excess by a simple renormalization of key components.

scholarly journals Particle dark matter physics: An update

Pramana ◽  
1998 ◽  
Vol 51 (1-2) ◽  
pp. 87-106 ◽  
Author(s):  
Manuel Drees
Keyword(s):  
Dark Matter ◽  
Particle Dark Matter

scholarly journals DARK MATTER DYNAMICS AND INDIRECT DETECTION

2005 ◽  
Vol 20 (14) ◽  
pp. 1021-1036 ◽  
Author(s):  
GIANFRANCO BERTONE ◽  
DAVID MERRITT
Keyword(s):  
Dark Matter ◽  
Total Mass ◽  
Galactic Center ◽  
Direct Detection ◽  
Indirect Detection ◽  
Matter Distribution ◽  
Dark Matter Distribution ◽  
Particle Dark Matter ◽  
The Universe ◽  
Rule Out

Non-baryonic, or "dark", matter is believed to be a major component of the total mass budget of the Universe. We review the candidates for particle dark matter and discuss the prospects for direct detection (via interaction of dark matter particles with laboratory detectors) and indirect detection (via observations of the products of dark matter self-annihilations), focusing in particular on the Galactic center, which is among the most promising targets for indirect detection studies. The gravitational potential at the Galactic center is dominated by stars and by the supermassive black hole, and the dark matter distribution is expected to evolve on sub-parsec scales due to interaction with these components. We discuss the dominant interaction mechanisms and show how they can be used to rule out certain extreme models for the dark matter distribution, thus increasing the information that can be gleaned from indirect detection searches.

scholarly journals Galactic halo models and particle dark-matter detection

1998 ◽  
Vol 57 (6) ◽  
pp. 3256-3263 ◽  
Author(s):  
Marc Kamionkowski ◽  
Ali Kinkhabwala
Keyword(s):  
Dark Matter ◽  
Galactic Halo ◽  
Particle Dark Matter ◽  
Dark Matter Detection ◽  
Matter Detection

scholarly journals 3.55 keV hint for decaying axionlike particle dark matter

2014 ◽  
Vol 89 (10) ◽  
Author(s):  
Joerg Jaeckel ◽  
Javier Redondo ◽  
Andreas Ringwald
Keyword(s):  
Dark Matter ◽  
Particle Dark Matter

Particle dark matter in the galactic halo: recent results from DAMA/LIBRAThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 141-152 ◽  
Author(s):  
R. Bernabei ◽  
P. Belli ◽  
F. Montecchia ◽  
F. Nozzoli ◽  
F. Cappella ◽  
...  
Keyword(s):  
Dark Matter ◽  
First Generation ◽  
Galactic Halo ◽  
National Laboratory ◽  
Cumulative Exposure ◽  
Independent Evidence ◽  
Annual Cycles ◽  
Atomic Systems ◽  
Model Independent ◽  
Particle Dark Matter

The DAMA/LIBRA experiment has a sensitive mass of about 250 kg highly radiopure NaI(Tl). It is running at the Gran Sasso National Laboratory of the INFN in Italy and is mainly devoted to the investigation of dark matter (DM) particles in the galactic halo by exploiting the model-independent DM annual modulation signature. The present DAMA/LIBRA and the former DAMA/NaI experiments (the first generation experiment having an exposed mass of about 100 kg) have thus far cumulatively released the results of data collected over 13 annual cycles (total exposure: 1.17 t year). They give model-independent evidence of the presence of DM particles in the galactic halo on the basis of the investigated DM signature at 8.9 σ C.L. for the cumulative exposure. The main aspects of the obtained results are summarized and some comments are addressed.

DARK MATTER SEARCH WITH GAMMA RAYS: THE EXPERIMENTS EGRET AND GLAST

2002 ◽  
Vol 17 (12n13) ◽  
pp. 1829-1840 ◽  
Author(s):  
ALDO MORSELLI
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Minimal Supersymmetric Standard Model ◽  
Gamma Rays ◽  
Galactic Center ◽  
Direct Detection ◽  
Model Parameters ◽  
Dark Matter Search

The direct detection of annihilation products in cosmic rays offers an alternative way to search for supersymmetric dark matter particles candidates. The study of the spectrum of gamma-rays, antiprotons and positrons offers good possibilities to perform this search in a significant portion of the Minimal Supersymmetric Standard Model parameters space. In particular the EGRET team have seen a convincing signal for a strong excess of emission from the galactic center that have not easily explanation with standard processes. We will review the achievable limits with the experiment GLAST taking into accounts the LEP results and we will compare this method with the antiproton and positrons experiments, the direct underground detection and with future experiments at LHC.

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