  We develop interactions from chiral effective field theory (EFT) that are
tailored to the harmonic oscillator basis. As a consequence, ultraviolet
convergence with respect to the model space is implemented by construction and
infrared convergence can be achieved by enlarging the model space for the
kinetic energy. In oscillator EFT, matrix elements of EFTs formulated for
continuous momenta are evaluated at the discrete momenta that stem from the
diagonalization of the kinetic energy in the finite oscillator space. By
fitting to realistic phase shifts and deuteron data we construct an effective
interaction from chiral EFT at next-to-leading order. Many-body coupled-cluster
calculations of nuclei up to 132Sn exhibit a fast convergence of ground-state
energies and radii in feasible model spaces.
