  We present an overview of various theoretical methods with detailed emphasis
on an intermediate Coulomb-U coupling model. This model is based on
material-specific ab-initio band structure from which correlation effects are
computed via self-consistent GW-based self-energy corrections arising from
spin-fluctuations. We apply this approach to four isostructural intermetallic
actinides PuCoIn5, PuCoGa5, PuRhGa5 belonging to the Pu-115 family, and UCoGa5,
a member of the U-115 family. The 115 families share the property of spin-orbit
split density of states enabling substantial spin fluctuations around 0.5 eV,
whose feedback effect on the electronic structure create mass renormalization
and electronic `hot spots`, i.e., regions of large spectral weight. A detailed
comparison is provided for the angle-resolved and angle-integrated
photoemission spectra and de Haas-van Alphen experimental data as available.
The results suggest that this class of actinides is adequately described by the
intermediate Coulomb interaction regime, where both itinerant and incoherent
features coexist in the electronic structure.
