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We present first ab initio no-core shell model (NCSM) calculations usingsimilarity renormalization group (SRG) transformed chiral two-nucleon (NN) plusthree-nucleon (3N) interactions for nuclei throughout the p-shell, particularly12-C and 16-O. By introducing an adaptive importance truncation for the NCSMmodel space and an efficient JT-coupling scheme for the 3N matrix elements, weare able to surpass previous NCSM studies including 3N interactions regarding,both, particle number and model-space size. We present ground and excitedstates in 12-C and 16-O for model spaces up to N_max=12 including full 3Ninteractions, which is sufficient to obtain converged results for softSRG-transformed interactions. We analyze the contributions of induced andinitial 3N interactions and probe induced 4N terms through the sensitivity ofthe energies on the SRG flow parameter. Unlike for light p-shell nuclei,SRG-induced 4N contributions originating from the long-range two-pion terms ofthe chiral 3N interaction are sizable in 12-C and 16-O.

Similarity-Transformed Chiral NN+3N Interactions for the Ab Initio Description of 12-C and 16-O