No Slip CMB
Micah Brush, Eric V. Linder, Miguel Zumalac\'arregui
TL;DR
No Slip Gravity is a modified gravity theory that suppresses growth, fits current cosmological data better than ΛCDM, and affects CMB lensing and B-mode polarization, with constraints derived from current CMB observations.
Contribution
The paper introduces No Slip Gravity, a simple modified gravity model that suppresses growth and impacts CMB lensing and polarization, with analytic approximations and observational constraints.
Findings
No Slip Gravity fits current data better than ΛCDM.
It affects CMB lensing and B-mode polarization.
Constraints from current CMB data limit the theory's parameters.
Abstract
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 mass fluctuation amplitude data better than CDM in general relativity, while retaining a CDM 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.
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