A neutron star is an example of a degenerate universe. It is a next-lower-order universe compared to our own universe.
A richly diverse universe such as our own cannot be superimposed upon the substrate of a neutron star.
The substrate of a neutron star is only about seven orders of magnitude larger than its stratum particles and only about twenty orders of magnitude larger than the wavelength of its substrate particles (i.e., neutrons).
As a consequence of its small size and large particles, neutron stars do not occupy enough space to enclose enough stratum particles to produce new universes; they are dead-end universes at the end of a long series of universe-producing universes.