Testing Gravity using Galaxy Redshift Surveys and CMB
131A Campbell Hall
Shadab Alam, CMU
The Redshift Space Distortions (RSD) in galaxy redshift surveys can probe the local dynamics at a given epoch of galaxy. I will discuss how redshift can help us learn the local dynamics and hence measure the nature of gravity at the epoch of the galaxy. I will show results from our recent analysis of SDSS-III high redshift sample (CMASS). I will then talk about combining similar RSD measurements from various other surveys to learn more about cosmology and modified gravity. I will show some of the current best constraints we have obtained for popular modified gravity models. I will end with a discussion on combining these measurements with CMB lensing in order to probe gravity to better precision and earlier time. I will also show the very first measurement of combining Planck CMB lensing and SDSS CMASS redshift space clustering.