Lawrence Berkeley National Laboratory
No Slip CMB
- Author(s): Brush, M
- Linder, EV
- Zumalacárregui, M
- et al.
Published Web Locationhttps://doi.org/10.1088/1475-7516/2019/01/029
© 2019 IOP Publishing Ltd and Sissa Medialab. No Slip Gravity is a simple modified gravity theory with only one free function and the interesting characteristic that - unlike many modified gravity theories - it suppresses growth. This allows it to fit current redshift space distortion and σ 8 mass fluctuation amplitude data better than ΛCDM in general relativity, while retaining a ΛCDM background expansion and hence distances. Since it has no gravitational slip it alters equally CMB lensing and matter density growth, and in addition affects the CMB gravitational wave B-mode polarization power spectrum. We investigate and compute the effects of No Slip Gravity for CMB lensing and B-modes, and present a simple analytic approximation. Using a Monte Carlo analysis, we place constraints on the theory from current CMB data.