Small second acoustic peak from interacting cold dark matter?

被引:16
作者
Dubovsky, SL [1 ]
Gorbunov, DS [1 ]
机构
[1] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
来源
PHYSICAL REVIEW D | 2001年 / 64卷 / 12期
关键词
D O I
10.1103/PhysRevD.64.123503
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider the possibility of explaining the observed suppression of the second acoustic peak in the anisotropy spectrum of the cosmic microwave background (CMB) by interaction between a fraction of nonbaryonic cold dark matter (CDM) and normal baryonic matter, This scenario does not require any modifications in standard big bang nucleosynthesis. We estimate the required values of the cross-section-to-mass ratio for elastic scattering of CDM particles off baryons. In the case of velocity-independent elastic scattering (in the velocity interval v similar to 10(-5)-10(3)) we find that such particles do not contradict observational limits if they are heavier than similar to 10(5) GeV or lighter than similar to0.5 GeV. Another candidate, which may appear in the models with infinite extra dimensions, is a quasistable charged particle decaying through tunneling into extra dimensions. Finally, a millicharged particle with an electric charge ranging from similar to 10(-4) to similar to 10(-1) and with a mass M similar to0.1 GeV-1 TeV also maybe responsible for the suppression of the second acoustic peak. Asa by-product we point out that CMB measurements set new limits on the allowed parameter space for the millicharged particles.
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页数:5
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