Precise Measurement of the Radial Baryon Acoustic Oscillation Scales in
  Galaxy Redshift Surveys
  In this paper we present a new method to extract cosmological parameters
using the radial scale of the Baryon Acoustic Oscillations as a standard ruler
in deep galaxy surveys. The method consists in an empirical parametrization of
the radial 2-point correlation function, which provides a robust and precise
extraction of the sound horizon scale. Moreover, it uses data from galaxy
surveys in a manner that is fully cosmology independent and therefore,
unbiased. A study of the main systematic errors and the validation of the
method in cosmological simulations are also presented, showing that the
measurement is limited only by cosmic variance. We then study the full
information contained in the Baryon Acoustic Oscillations, obtaining that the
combination of the radial and angular determinations of this scale is a very
sensitive probe of cosmological parameters, able to set strong constraints on
the dark energy properties, even without combining it with any other probe.
