Max Tegmark's library: galfisher

Accuracy with which the Sloan Digital Sky Survey can measure the slope, amplitude and horizontal location of the power spectrum as well as the baryon density, plotted as a function of the smallest scale k that you trust.

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Measuring cosmological parameters with galaxy surveys


Max Tegmark


We assess the accuracy with which future galaxy surveys can measure cosmological parameters by deriving a handy approximation that we validate numerically. We find that galaxy surveys are quite complementary to future Cosmic Microwave Background (CMB) experiments. By breaking parameter degeneracies of the Planck CMB satellite in a cold dark matter cosmology, the Sloan Digital Sky Survey might be able to reduce the Planck error bars by about an order of magnitude on the large-scale power normalization and the reionization optical depth, down to percent levels. The main source of uncertainty is found to be our ability to extract useful information from the mildly nonlinear regime.

Publication info:

Phys. Rev. Lett., 79, 3806

Online references:

This site also contains the latest (non-astro/ph) versions of some papers that are referenced in the text; Bond, Efstathiou & Tegmark 1997. Tegmark, Taylor & Heavens 1997, Tegmark 1997b,

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This page was last modified July 1, 1998.