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"Cosmological parameters from SDSS
and WMAP," by Max Tegmark and 60
others, Physical Review D,
69(10): 103501, May 2004.
[Authors' affiliations: 23 institutions
worldwide]
Abstract:
"We measure cosmological parameters using the three-dimensional power
spectrum P(k) from over 200,000 galaxies in the Sloan Digital Sky Survey (SDSS)
in combination with Wilkinson Microwave Anisotropy Probe (WMAP) and other
data. Our results are consistent with a "vanilla" flat adiabatic
cold dark matter model with a cosmological constant without tilt (n(s)=1),
running tilt, tensor modes, or massive neutrinos. Adding SDSS information more
than halves the WMAP-only error bars on some parameters, tightening 1sigma
constraints on the Hubble parameter from h (approximate to) 0.74(-0.07)(+0.18)
to h (approximate to) 0.70(-0.03)(+0.04), on the matter density from Omega(m)
)approximate to) 0.25+/-0.10 to Omega(m)approximate to0.30+/-0.04 (1sigma) and
on neutrino masses from <11 to <0.6 eV (95%). SDSS helps even more when
dropping prior assumptions about curvature, neutrinos, tensor modes and the
equation of state. Our results are in substantial agreement with the joint
analysis of WMAP and the Two Degree Field Galaxy Redshift Survey, which is an
impressive consistency check with independent redshift survey data and
analysis techniques. In this paper, we place particular emphasis on clarifying
the physical origin of the constraints, i.e., what we do and do not know when
using different data sets and prior assumptions. For instance, dropping the
assumption that space is perfectly flat, the WMAP-only constraint on the
measured age of the Universe tightens from t(0) (approximate to)
16.3(-1.8)(+2.3) Gyr to t(0) (approximate to) 14.1(-0.9)(+1.0) Gyr by adding
SDSS and SN Ia data. Including tensors, running tilt, neutrino mass and
equation of state in the list of free parameters, many constraints are still
quite weak, but future cosmological measurements from SDSS and other sources
should allow these to be substantially tightened."
This 2004 report from Physical Review D
was cited 45 times in current journal articles indexed by
Thomson Scientific during January-February 2006. Thanks to its latest
two-month tally, this paper earns its third consecutive ranking in the #2 spot
among the most-cited physics papers published in the last two years, aside
from reviews. Prior to the most recent bimonthly count, citations to the paper
have accrued as follows:
November-December 2005: 36 citations
September-October 2005: 51
July-August 2005: 33
May-June 2005: 49
March-April 2005: 20
January-February 2005: 37
November-December 2004: 28
September-October 2004: 23
July-August 2004: 13
Total citations to date: 335
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