We consider the potential for line intensity mapping (LIM) of the rotational CO(1-0), CO(2-1) and CO(3-2) transitions to detect deviations from General Relativity from 0<z<3 within the framework of a very general class of modified gravity models, called Horndeski theories. Our forecast assumes a multi-tracer analysis separately obtaining information from the matter power spectrum and the first two multipoles of the redshift space distortion power spectrum. To achieve ±0.1 level constraints on the slope of the kinetic gravity braiding and Planck mass evolution parameters, a mm-wave LIM experiment would need to accumulate ≈108−109 spectrometer hours, feasible with instruments that could be deployed in the 2030s. Such a measurement would constrain large portions of the remaining parameter space available to Scalar-Tensor modified gravity theories. Our modeling code is publicly available.
@article{arxiv.2209.13029,
title = {A Forecast for Large Scale Structure Constraints on Horndeski Gravity with Line Intensity Mapping},
author = {Bryan R. Scott and Kirit S. Karkare and Simeon Bird},
journal= {arXiv preprint arXiv:2209.13029},
year = {2023}
}
Comments
13 pages, 5 figures; to be submitted to Monthly Notices of the Royal Astronomical Society