Nonlinear Scales in Luminal Horndeski -- I. Halo mass function and power spectrum boost in models with Vainshtein screening

Dani de Boe, Mattia Pantiri, Gen Ye +1

We investigate nonlinear structure formation in Horndeski gravity with luminal gravitational wave speed ($c_T=1$), assuming Vainshtein screening within the spherical collapse mod…