Invariant analysis and exact solutions of nonlinear time fractional Sharma-Tasso-Olver equation by Lie group analysis

This paper is concerned with the time fractional Sharma-Tasso-Olver (FSTO) equation, Lie point symmetries of the FSTO equation with the Riemann-Liouville derivatives are considered. By using the Lie group analysis method, the invariance properties of the FSTO equation are investigated. In the sense of point symmetry, the vector fields of the FSTO equation are presented. And then, the symmetry reductions are provided. By making use of the obtained Lie point symmetries, it is shown that this equation can transform into a nonlinear ordinary differential equation of fractional order with the new independent variable xi=xt (-alpha/3). The derivative is an Erd,lyi-Kober derivative depending on a parameter alpha. At last, by means of the sub-equation method, some exact and explicit solutions to the FSTO equation are given.