Comment on "The Mass-Radius relation for Neutron Stars in $f(R)$ gravity" by S. Capozziello, M. De Laurentis, R. Farinelli and S. Odintsov

Understand

In the present comment we discuss the qualitative and the quantitative differences between the neutron stars models in $f(R)$ gravity presented in the recent paper \cite{Capozziello2015} (Capozziello et al.

• (2015)) and in our paper \cite{Yazadjiev2014} (Yazadjiev et al.
• (2014)).
• The authors of \cite{Capozziello2015} claim that these differences come from the fact that they are using the physical Jordan frame while we are working in the Einstein frame.