<< Cosmo.WebHome %TOC% ---- ---+ Cosmic Curvature (standard ruler) Some of the most important parameters of the metric are those that directly affect the curvature of three-dimensional comoving spatial sections. <a href="http://cdsads.u-strasbg.fr/abs/2002A%26A...382..397R"><img src="%ATTACHURLPATH%/../CosmoProjectsBrief/metric_par.jpg" alt="metric parameters image" width='200' height='200' style="float:left; margin-right: 20px"/></a> This mainly includes %$\Omega_m$% and %$\Omega_\Lambda$%. The first (and possibly the only, so far) simultaneous constraint on both %$\Omega_m$% and %$\Omega_\Lambda$% from within a single survey, using a standard ruler method, is AstroPh:0106135 - Roukema, Mamon, Bajtlik (2002). This topic is generally referred to today as BAO - the use of baryonic acoustic oscillations - although in fact can be more general, i.e. make less assumptions. The best-cited example of BAO usage is AstroPh:0501171 SDSS z < 0.47 Eisenstein et al., who estimated Omega_total = 1.010\pm0.009. Updating Roukema, Mamon & Bajtlik (2002) on newer QSO redshift surveys should result in preciser, and hopefully more accurate, estimates of these metric parameters.
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Topic revision:
06 Sep 2010,
BoudRoukema
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