  Motivated by recent advance in orbitally tuned Feshbach resonance
experiments, we analyze the ground-state phase diagram and related low-energy
excitation spectra of a d-wave interacting Bose gas. A two-channel model with
d-wave symmetric interactions and background s-wave interactions is adopted to
characterize the gas. The ground state is found to show three interesting
phases: atomic, molecular, and atomic-molecular superfluidity. Remarkably
differently from what was previously known in the p-wave case, the atomic
superfluid is found to be momentum-independent in the present d-wave case.
Bogoliubov spectra above each superfluid phase are obtained both analytically
and numerically.
