Kinetic Sunyaev-Zeldovich effect in modified gravity
  We investigate the impact of modified theories of gravity on the kinetic
Sunyaev-Zeldovich (kSZ) effect of the cosmic microwave background. We focus on
a specific class of $f(R)$ models of gravity and compare their predictions for
the kSZ power spectrum to that of the $\Lambda$CDM model. We use a publicly
available modified version of Halofit to properly include the nonlinear matter
power spectrum of $f(R)$ in the modeling of the kSZ signal. We find that the
well-known modifications of the growth rate of structure in $f(R)$ can indeed
induce sizable changes in the kSZ signal, which are more significant than the
changes induced by modifications of the expansion history. We discuss prospects
of using the kSZ signal as a complementary probe of modified gravity, giving an
overview of assumptions and possible caveats in the modeling.
