How to Falsify the GR+LambdaCDM Model with Galaxy Redshift Surveys

Understand

A wide range of models describing modifications to General Relativity have been proposed, but no fundamental parameter set exists to describe them.

• Similarly, no fundamental theory exists for dark energy to parameterize its potential deviation from a cosmological constant.
• This motivates a model-independent search for deviations from the concordance GR+LambdaCDM cosmological model in large galaxy redshift surveys.
• We describe two model-independent tests of the growth of cosmological structure, in the form of quantities that must equal one if GR+LambdaCDM is correct.