A Lopsided Outer Solar System?

Axisymmetric disks of eccentric orbits in near-Keplerian potentials are unstable to an out-of-plane buckling. Recently, Zderic et al. (2020) showed that idealized disk saturates a lopsided mode. Here we show this apsidal clustering also occurs primordial scattered the outer solar system which includes orbit-averaged gravitational influence giant planets. We explain dynamics using Lynden-Bell (1979)'s mechanism for bar formation galaxies. surface density and line sight velocity plots at different times during instability, highlighting concentric circles spiral arms space.