464 citations · 5.1k across the 58 of their papers we have counts for
4 papers · 1 filter
Using Voids to Unscreen Modified Gravity
B. Falck, Kazuya Koyama, Gong-bo Zhao +1
The Vainshtein mechanism, present in many models of gravity, is very effective at screening dark matter halos such that the fifth force is negligible and general relativity is reco…
Revealing modified gravity signal in matter and halo hierarchical clustering
Wojciech A. Hellwing, Kazuya Koyama, Benjamin Bose +1
We use a set of N-body simulations employing a modified gravity (MG) model with Vainshtein screening to study matter and halo hierarchical clustering. As test-case scenarios we con…
COLA with scale-dependent growth: applications to screened modified gravity models
Hans A. Winther, Kazuya Koyama, Marc Manera +2
We present a general parallelized and easy-to-use code to perform numerical simulations of structure formation using the COLA (COmoving Lagrangian Acceleration) method for cosmolog…
Theoretical Accuracy in Cosmological Growth Estimation
Benjamin Bose, Kazuya Koyama, Wojciech A. Hellwing +2
We elucidate the importance of the consistent treatment of gravity-model specific non-linearities when estimating the growth of cosmological structures from redshift space distorti…