Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-07
Phys.Rev. D64 (2001) 123503
Astronomy and Astrophysics
Astrophysics
10 pages, 1 figure
Scientific paper
10.1103/PhysRevD.64.123503
We consider a possibility to explain the observed suppression of the second acoustic peak in the anisotropy spectrum of the Cosmic Microwave Background (CMB) by interaction between a fraction of non-baryonic Cold Dark Matter (CDM) and normal baryonic matter. This scenario does not require any modifications in the standard Big Bang Nucleosynthesis (BBN). We estimate the required values of the cross-section-to-mass ratio for elastic scattering of CDM particles off baryons. In case of velocity-independent elastic scattering (in the velocity interval 10^{-5}--10^{-3}) we find that such particles do not contradict observational limits if they are heavier than \sim 10^5 GeV or lighter than \sim 0.5 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 the electric charge ranging from \sim 10^{-4} to \sim 10^{-1} and with mass M\sim 0.1 GeV--1 TeV also may be responsible for the suppression of the second acoustic peak. As a byproduct we point out that CMB measurements set new limits on the allowed parameter space for the millicharged particles.
Dubovsky S. L.
Gorbunov Dmitry S.
No associations
LandOfFree
Small Second Acoustic Peak from Interacting Cold Dark Matter? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Small Second Acoustic Peak from Interacting Cold Dark Matter?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Small Second Acoustic Peak from Interacting Cold Dark Matter? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-541298