text: 82,38,1288395405831675904,54849207,Ian Harrison,"New paper with @Tessa_M_Baker on arXiv: <LINK> Main point is in this figure... When it comes to constraining modified gravity, LIGO standard sirens help out LSS a bit, but LISA standard sirens help a lot! <LINK> @Tessa_M_Baker (personal note/mea culpa: this paper has had a couple of false starts over the past year or two, so it is great for it to be public finally!) @SeshNadathur @Tessa_M_Baker No, we made the decision not to go through with the machinery for fsigma_8 forecasts. Some insight can be had in the propto O_de case by comparing to <LINK> Table 1 (although those are Fishers).",https://arxiv.org/abs/2007.13791,"The first multi-messenger gravitational wave event has had a transformative effect on the space of modified gravity models. In this paper we study the enhanced tests of gravity that are possible with a future set of gravitational wave standard siren events. We perform MCMC constraint forecasts for parameters in Horndeski scalar-tensor theories. In particular, we focus on the complementarity of gravitational waves with electromagnetic large-scale structure data from galaxy surveys. We find that the addition of fifty low redshift ($z \lesssim 0.2$) standard sirens from the advanced LIGO network offers only a modest improvement (a factor 1.1 -- 1.3, where 1.0 is no improvement) over existing constraints from electromagnetic observations of large-scale structures. In contrast, high redshift (up to $z \sim 10$) standard sirens from the future LISA satellite will improve constraints on the time evolution of the Planck mass in Horndeski theories by a factor $\sim 5$. By simulating different scenarios, we find this improvement to be robust to marginalisation over unknown merger inclination angles and to variation between three plausible models for the merger source population. ","Constraining Scalar-Tensor Modified Gravity with Gravitational Waves and