Electromagnetic sum rules and response functions from an ab initio symmetry-adapted framework

We will discuss recent work to combine the ab initio symmetry-adapted no-core shell model (SA-NCSM) with the Lorentz integral transform method in order to study the underlying dynamic properties of intermediate mass nuclei from first principles. The SA-NCSM employs realistic interactions and can handle ultra-large model spaces in nuclei up through the calcium region by utilizing symmetries known to dominate the nuclear dynamics. Coupling with the Lorentz integral transform method allows us to calculate electromagnetic sum rules and response functions for nuclei beyond the reach of other methods. We will present benchmark calculations for He-4, compared to the exact solutions of the hyperspherical harmonics method, as well as preliminary electromagnetic response functions obtained in this approach.