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Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda CDM N-body simulation results - Abandoning hope in clumpiness enhancement?
Lavalle, J; Yuan Q(袁强); Bi XJ(毕效军); Yuan, Q; Maurin, D; Bi, XJ
2008
发表期刊ASTRONOMY & ASTROPHYSICS
卷号479期号:2页码:427-U41
通讯作者[Lavalle, J.] Univ Aix Marseille 2, Ctr Phys Particules CPPM, CNRS, IN2P3, F-13288 Marseille 09, France ; [Yuan, Q. ; Bi, X. -J.] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Maurin, D.] Univ Paris 06 & 07, LPNHE, CNRS, IN2P3, F-75252 Paris, France
摘要Context. Anti-proton and positron Galactic cosmic ray spectra are among the key targets for indirect detection of dark matter. The boost factors, corresponding to an enhancement of the signal, and linked to the clumpiness properties of the dark matter distribution, have been taken as high as thousands in the past. The dramatic impact of these boost factors for indirect detection of antiparticles, for instance with the PAMELA satellite or the coming AMS-02 experiment, asks for their detailed calculation. Aims. We take into account the state-of-the-art results of high resolution N-body dark matter simulations to calculate the most likely energy dependent boost factors, which are linked to the cosmic ray propagation properties, for anti-protons and positrons. The results from extreme, but still possible, configurations of the clumpy dark matter component are also discussed. Methods. Starting from the mass and space distributions of sub-halos, the anti-proton and positron propagators are used to calculate the mean value and the variance of the boost factor for the primary fluxes. We take advantage of the statistical method introduced in Lavalle et al. (2007) and cross-check the results with Monte Carlo computations. Results. By spanning some extreme configurations of sub-halo and propagation properties, we find that the average contribution of the clumps is negligible compared to that of the smooth dark matter component. Dark matter clumps do not lead to enhancement of the signals, unless they are taken with some extreme (unexpected) properties. This result is independent of the nature of the self-annihilating dark matter candidate considered, and provides precise estimates of the theoretical and the statistical uncertainties of the antimatter flux from sub-halos. Conclusions. Spectral distortions can still be expected in antimatter flux measurements, but scenarios invoking large and even mild clumpiness boost factors are strongly disfavoured by our analysis. Some very extreme configurations could still lead to large enhancements, e. g. (i) very small clumps with masses less than or similar to 10(-6) M-circle dot following a M-alpha mass distribution with alpha greater than or similar to 2, highly concentrated with internal r(-beta) profiles with beta greater than or similar to 1.5, and spatially distributed according to the smooth component; or (ii) a big sub-halo of mass greater than or similar to 0(7) M-circle dot within a distance of less than or similar to 1 kpc from the Earth. However, they are very unlikely from either theoretical or statistical arguments.
文章类型Review
关键词cosmology : dark matter
学科领域Astronomy & Astrophysics
DOI10.1051/0004-6361:20078723
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000253039600017
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被引频次:102[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/237438
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Lavalle, J,Yuan Q,Bi XJ,et al. Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda CDM N-body simulation results - Abandoning hope in clumpiness enhancement?[J]. ASTRONOMY & ASTROPHYSICS,2008,479(2):427-U41.
APA Lavalle, J,袁强,毕效军,Yuan, Q,Maurin, D,&Bi, XJ.(2008).Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda CDM N-body simulation results - Abandoning hope in clumpiness enhancement?.ASTRONOMY & ASTROPHYSICS,479(2),427-U41.
MLA Lavalle, J,et al."Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda CDM N-body simulation results - Abandoning hope in clumpiness enhancement?".ASTRONOMY & ASTROPHYSICS 479.2(2008):427-U41.
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