Non-linear Evolution of Matter Power Spectrum in Modified Theory of Gravity

Understand

We present a formalism to calculate the non-linear matter power spectrum in modified gravity models that explain the late-time acceleration of the Universe without dark energy.

• Any successful modified gravity models should contain a mechanism to recover General Relativity (GR) on small scales in order to avoid the stringent constrains on deviations from GR at solar system scales.
• Based on our formalism, the quasi non-linear power spectrum in the Dvali-Gabadadze-Porratti (DGP) braneworld models and $f(R)$ gravity models are derived by taking into account the mechanism to recover GR properly.
• We also extrapolate our predictions to fully non-linear scales using the Parametrized Post Friedmann (PPF) framework.