Do sewn singularities falsify the Palatini cosmology?

Understand

We investigate further (cf.

• arXiv:1512.01199, JCAP01 (2016) 040) Starobinsky cosmological model $R+\gamma R^2$ in the Palatini formalism with Chaplygin gas and baryonic matter as a source.
• For this aim we use dynamical system theory.
• The dynamics is reduced to the 2D sewn dynamical system of a Newtonian type (a piecewise-smooth dynamical system).