The Smallscale Clustering Power Spectrum and Relativistic Decays
Abstract
We present constraints on decaying-particle models in which an enhanced relativistic density allows an {OMEGA} = 1 Cold Dark Matter universe to be reconciled with acceptable values for the Hubble constant. Such models may contain extra small-scale power, which can have important consequences for enhanced object formation at high redshifts. Small-scale galaxy clustering and abundances of high-redshift damped Lyman α absorption clouds give a preferred range for the mass of any such decaying particle of 2 to 30 keV and a lifetime of 0.5 to 100 yr for models with a high Hubble constant (h >0.75). A lower Hubble constant, h ~0.5, weakens the constraint to 0.5 < m < 30 keV, 0.2 < t < 500 yr. In permitted versions of the model, reionization occurs at redshifts ~10 - 200, and this feature may be of importance in understanding degree-scale CMB anisotropies.
- Publication:
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Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 1995
- DOI:
- 10.1093/mnras/277.1.143
- arXiv:
- arXiv:astro-ph/9506075
- Bibcode:
- 1995MNRAS.277..143M
- Keywords:
-
- Astrophysics
- E-Print:
- MNRAS in press. 7 pages plain TeX in the form of a uu-encoded postscript file. Figure .ps files, plus TeX source and macros available via anonymous ftp at ftp://ftp.roe.ac.uk/pub/jap/pbump