Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas

被引：132

作者：

Cirelli, Marco ^{[1
,2
]}

Iocco, Fabio ^{[1
,2
,3
]}

Panci, Paolo ^{[1
,2
,4
,5
]}

机构：

[1] CNRS, Inst Phys Theor, URA 2306, F-91191 Gif Sur Yvette, France

[2] CEA Saclay, F-91191 Gif Sur Yvette, France

[3] Univ Paris 06, Inst Astrophys Paris, CNRS, UMR 7095, F-75014 Paris, France

[4] Univ Aquila, Dipartimento Fis, I-67010 Coppito, AQ, Italy

[5] Univ Paris 07, UFR Phys, F-75205 Paris, France

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2009年 / 10期

关键词：

dark matter theory; reionization; dark matter detectors; RAY POSITRON FRACTION; COSMIC REIONIZATION; SPIRAL GALAXIES; ELECTRONS; ABSORPTION; COSMOLOGY; QUASAR; Z-SIMILAR-TO-6; ASTROPHYSICS; EVOLUTION;

D O I：

10.1088/1475-7516/2009/10/009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dark Matter annihilations after recombination and during the epoch of structure formation deposit energy in the primordial intergalactic medium, producing reionization and heating. We investigate the constraints that are imposed by the observed optical depth of the Universe and the measured temperature of the intergalactic gas. We find that the bounds are significant, and have the power to rule out large portions of the 'DM mass/cross section' parameter space. The optical depth bound is generally stronger and does not depend significantly on the history of structure formation. The temperature bound can be competitive in some cases for small masses or the hadronic annihilation channels ( and is affected somewhat by the details of structure formation). We find in particular that DM particles with a large annihilation cross section into leptons and a few TeV mass, such as those needed to explain the PAMELA and FERMI+HESS cosmic ray excesses in terms of Dark Matter, are ruled out as they produce too many free electrons. We also find that low mass particles (less than or similar to 10 GeV) tend to heat too much the gas and are therefore disfavored.

引用

页数：26

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