Using peculiar velocity surveys to constrain the growth rate of structure with the wide-angle effect

Understand

Amongst the most popular explanations for dark energy are modified theories of gravity.

• The galaxy overdensity and peculiar velocity fields help us to constrain the growth rate of structure and distinguish different models of gravity.
• We introduce an improved method for constraining the growth rate of structure with the galaxy overdensity and peculiar velocity fields.
• This method reduces the modelling systematic error by accounting for the wide-angle effect and the zero-point calibration uncertainty during the modelling process.