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separation that is an excellent match to the predicted shape and location of the imprint of the recombination-epoch acoustic oscillations on the low-redshift clustering of matter.
This detection demonstrates the linear growth of structure by gravitational instability between
and the present and confirms a firm prediction of the standard cosmological theory.
The acoustic peak provides a standard ruler by which we can measure the ratio of the distances to
and
to 4% fractional accuracy and the absolute distance to
to 5% accuracy.
From the overall shape of the correlation function,
we measure the matter density
to 8% and find agreement with the value from cosmic microwave background (CMB) anisotropies.
Independent of the constraints provided by the CMB acoustic scale,
we find
.
Including the CMB acoustic scale,
we find that the spatial curvature is
if the dark energy is a cosmological constant.
eV and the mass of lightest neutrino is
eV at 95% c.l.
For the 3 massless + 1 massive neutrino case we find
eV for the massive neutrino,
excluding at 95% c.l.
all neutrino mass solutions compatible with the LSND results.
from over 200,000 galaxies in the Sloan Digital Sky Survey (SDSS) in combination with WMAP and other data.
Our results are consistent with a "vanilla" flat adiabatic
model without tilt (
),
running tilt,
tensor modes or massive neutrinos.
Adding SDSS information more than halves the WMAP-only error bars on some parameters,
tightening
constraints on the Hubble parameter from
to
,
on the matter density from
to
and on neutrino masses from
to
(95%).
,
and obtain a 95% upper limit
.
[astro-ph/0302209] by combining WMAP with the 2dFGRS.
This limit is a factor of three lower than ours because of their stronger priors,
most importantly that on galaxy bias
determined using a bispectrum analysis of the 2dF galaxy clustering data [astro-ph/0112161]....
Since the bias is marginalized over,
our SDSS neutrino constraints come not from the amplitude of the power spectrum,
only from its shape.
Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6,
X. Fan et al.
(SDSS),
Astron. J. 125 (2003) 1649,
arXiv:astro-ph/0301135.
Max Tegmark's SDSS page
Authors: