Toward More Realistic Forecasting of Dark Energy Constraints from Galaxy
  Redshift Surveys
  Galaxy redshift surveys are becoming increasingly important as a dark energy
probe. We improve the forecasting of dark energy constraints from galaxy
redshift surveys by using the "dewiggled" galaxy power spectrum, P_{dw}(k), in
the Fisher matrix calculations. Since P_{dw}(k) is a good fit to real galaxy
clustering data over most of the scale range of interest, our approach is more
realistic compared to previous work in forecasting dark energy constraints from
galaxy redshift surveys. We find that our new approach gives results in
excellent agreement when compared to the results from the actual data analysis
of the clustering of the Sloan Digital Sky Survey DR7 luminous red galaxies. We
provide forecasts of the dark energy constraints from a plausible Stage IV
galaxy redshift survey.
