Conformal Attractor Solver for Cubic Horndeski Gravity

This repository contains the numerical linear growth solver used to investigate the conformal attractor regime in cubic Horndeski gravity, as presented in the paper: "Conformal Attractors in Cubic Horndeski Gravity: Decisive Resolution of the S_8 Tension via Dynamical Planck Mass Friction". The provided Python script solves the linearized matter density perturbations in the quasi-static sub-horizon approximation. It demonstrates how a dynamical suppression of structure growth, driven by a friction term \dot{M}_*/M_*, effectively resolves the S_8 tension when compared against DESI 2024 f\sigma_8 data.