Cosmological Leverage from the Matter Power Spectrum in the Presence of Baryon and Nonlinear Effects

Abstract

We investigate how the use of higher wavenumbers (smaller scales) in the galaxy clustering power spectrum influences cosmological constraints. We take into account uncertainties from nonlinear density fluctuations, (scale dependent) galaxy bias, and baryonic effects. Allowing for substantially model independent uncertainties through separate fit parameters in each wavenumber bin that also allow for the redshift evolution, we quantify strong gains in dark energy and neutrino mass leverage with increasing maximum wavenumber, despite marginalizing over numerous (up to 125) extra fit parameters. The leverage is due to not only an increased number of modes but, more significantly, breaking of degeneracies beyond the linear regime.

arXiv comment10 pages, 6 figures

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• Joint Measurement of Lensing-Galaxy Correlations Using SPT and DES SV Data
• Cosmic Shear as a Probe of Galaxy Formation Physics
• Fitting and forecasting non-linear coupled dark energy
• The Quest for the Inflationary Spectral Runnings in the Presence of Systematic Errors
• Linear and non-linear Modified Gravity forecasts with future surveys