文章与日志

Cosmological Parameters from Eigenmode Analysis of Sloan Digital Sky Survey Galaxy Redshifts

原文

We present estimates of cosmological parameters from the application of the Karhunen-Loève transform to the analysis of the 3D power spectrum of density fluctuations using Sloan Digital Sky Survey galaxy redshifts. We use mh and fb = b/m to describe the shape of the power spectrum, 8gL" align="middle"> for the (linearly extrapolated) normalization, and to parametrize linear theory redshift space distortions. On scales k 0.16hMpc–1, our maximum likelihood values are mh = 0.264 ± 0.043, fb = 0.286 ± 0.065, 8gL" align="middle"> = 0.966 ± 0.048, and = 0.45 ± 0.12. When we take a prior on b from WMAP, we find mh = 0.207 ± 0.030, which is in excellent agreement with WMAP and 2dF. This indicates that we have reasonably measured the gross shape of the power spectrum but we have difficulty breaking the degeneracy between mh and fb because the baryon oscillations are not resolved in the current spectroscopic survey window function. ©2004 American Institute of Physics

Recent CMB Observations

Edward L. Wright
UCLA Physics & Astronomy, PO Box 951562, Los Angeles, CA 90095-1562

The study of the Universe using anisotropies of the Cosmic Microwave Background (CMB) have advanced significantly in the last year and will continue to advance at a rapid pace. In this paper I will discuss the medium angular resolution temperature anisotropy data from WMAP and ARCHEOPS, the medium angular resolution polarization anisotropy data from WMAP and DASIPOL, and the high angular resolution temperature anisotropy from ACBAR and CBI. ©2004 American Institute of Physics

The Universe as Seen by the Wilkinson Microwave Anisotropy Probe

Eiichiro Komatsu
Department of Astronomy, The University of Texas at Austin, Austin, TX 78712

The Wilkinson Microwave Anisotropy Probe (WMAP) is currently mapping temperature and polarization anisotropies of the cosmic microwave background radiation on the full sky in 5 microwave bands. We summarize major scientific results obtained from the first year data released on February 11, 2003: (1) precision determinations of the cosmological parameters, (2) discovery of early reionization of the universe, and (3) implications for the Inflationary paradigm. ©2004 American Institute of Physics

以上文献均来自
AIP Conference Proceedings Volume 743
THE NEW COSMOLOGY: Conference on Strings and Cosmology; The Mitchell Symposium on Observational Cosmology