Cosmological Inflation in a Generalized Unimodular Gravity
  We study some aspects of cosmological inflation in the framework of
unimodular $f(R)$ gravity. To be more clarified, we consider a generic $f(R)$
of the type $f(R)=R+\alpha R^{n}$. By considering Einstein frame counterpart of
the unimodular $f(R)$ gravity, we set the scalaron to be responsible for
cosmological inflation in this setup. We confront our model parameters space
with observational data and impose some constraints on the value of $n$ in this
manner. We show that for the number of e-folds $N=60$, the model is consistent
with observation if $1.89<n<1.918$.
