Observational tests of a two parameter power-law class modified gravity in Palatini formalism

Shant Baghram, M. Sadegh Movahed, Sohrab Rahvar

{\bf{CONTEXT}}: In this work we propose a modified gravity action $f(R)=(R^n-R_0^n{)}^{1/n}$ with two free parameters of $n$ and $R_0$ and derive the dynamics of a universe for t…