Momentum Ray Transforms, II: Range Characterization In the Schwartz space

The momentum ray transform $I^k$ integrates a rank $m$ symmetric tensor field $f$ over lines of ${\mathbb{R}}^n$ with the weight $t^k$: (I^k\!f)(x,\xi)=\int_{-\infty}^\infty t^k\l f(x+t\xi),\xi^m\r\,dt. We give the range characterization for the operator $f\mapsto(I^0!f,I^1!f,\dots, I^m!f)$ontheSchwartzspaceofrank$m$ smooth fast decaying tensor fields. In dimensions $n\ge 3$, the range is characterized by certain differential equations of order $2(m+1)$ which generalize the classical John equations. In the two-dimensional case, the range is characterized by certain integral conditions which generalize the classical Gelfand – Helgason – Ludwig conditions.