摘要
We prove the global existence of the unique mild solution for the Cauchy problem of the cut-off Boltzmann equation for soft potential model (Formula presented.) with initial data small in (Formula presented.) where (Formula presented.) is the dimension. The proof relies on the existing inhomogeneous Strichartz estimates for the kinetic equation by Ovcharov (SIAM J Math Anal 43(3):1282–1310, 2011) and convolution-like estimates for the gain term of the Boltzmann collision operator by Alonso et al. (Commun Math Phys 298:293–322, 2010). The global dynamics of the solution is also characterized by showing that the small global solution scatters with respect to the kinetic transport operator in (Formula presented.). Also the connection between function spaces and cut-off soft potential model (Formula presented.) is characterized in the local well-posedness result for the Cauchy problem with large initial data.