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2012

Constraining Cosmic Expansion and Gravity with Galaxy Redshift Surveys

Daniel, Scott F., Linder, Eric V.

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We analyze the science reach of a next generation galaxy redshift survey such as BigBOSS to fit simultaneously for time varying dark energy equation of state and time- and scale-dependent gravity.

The simultaneous fit avoids potential bias from assuming $\Lambda$CDM expansion or general relativity and leads to only modest degradation in constraints.
Galaxy bias, fit freely in redshift bins, is self calibrated by spectroscopic measurements of redshift space distortions and causes little impact.
The combination of galaxy redshift, cosmic microwave background, and supernova distance data can deliver 5-10% constraints on 6 model independent modified gravity quantities.

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