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A robust technique for estimating cosmological parameters
Martin A. Hendry
Dept. of Physics and Astronomy, Glasgow University, U.K.
The impact of observational selection eects on the estimation of
cosmological parameters from galaxy redshift surveys is a topic of
considerable interest - and some controversy - in cosmology. We
present a new, non-parametric, technique for extracting informa-
tion from galaxy surveys which circumvents a number of prob-
lematic issues aecting traditional, parametric, methods. Our
ROBUST technique builds on the C-method and allows deter-
mination of cosmological parameters free of almost any model as-
sumptions concerning the galaxy luminosity function and spatial
clustering. We also describe a related technique which provides
a non-parametric test of completeness in ux-limited galaxy sur-
veys.
We illustrate ROBUST by estimating the Hubble parameter and
linear bias parameter from recent redshift-distance data. We also
discuss applications to the study of the galaxy luminosity function
and testing the homogeneity of the Universe on large scales.
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