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Relativistic ab initio Theory for Nuclear Matter and Nuclei

Field theoretical approaches to nuclear dynamics are most promising for understanding the interplay of strong interactions and nuclear many-body dynamics. Such a program, allowing to calculate in-medium interactions ab initio from the free space baryon-baryon (BB) interactions is the aim of the Density Dependent Relativistic Hadron (DDRH) field theory. In DDRH theory we consider meson exchange processes as the relevant and dominant degrees of freedom for interactions in free space and nuclear matter. This picture is well established and impressively confirmed by the good description of NN phase shifts and other onshell observables with the existing relativistic one-boson NN potentials. Since we are interested also in extensions of the theory to hypernuclei we include the pseudo-scalar and vector meson multiplets and also the experimentally less well established nonet of scalar mesons. However, nuclear matter calculations obviously probe the meson spectrum only in the tand u-channels without direct reference to s-channel meson spectral functions.