@article{ISI:000470882000006,
 abstract = {We show experimentally that a pair of disks settling at negligible
Reynolds number (similar to 10(-4)) displays two classes of bound
periodic orbits, each with transitions to scattering states. We account
for these dynamics, at leading far-field order, through an effective
Hamiltonian in which gravitational driving endows orientation with the
properties of momentum. This treatment is successfully compared against
the measured properties of orbits and critical parameters of transitions
between types of orbits. We demonstrate a precise correspondence with
the Kepler problem of planetary motion for a wide range of initial
conditions, find and account for a family of orbits with no Keplerian
analog, and highlight the role of orientation as momentum in the
many-disk problem.},
 article-number = {224501},
 author = {Chajwa, Rahul and Menon, Narayanan and Ramaswamy, Sriram},
 doi = {10.1103/PhysRevLett.122.224501},
 eissn = {1079-7114},
 issn = {0031-9007},
 journal = {PHYSICAL REVIEW LETTERS},
 month = {JUN 4},
 number = {22},
 orcid-numbers = {Chajwa, Rahul/0000-0002-6488-1834},
 times-cited = {1},
 title = {Kepler Orbits in Pairs of Disks Settling in a Viscous Fluid},
 unique-id = {ISI:000470882000006},
 volume = {122},
 year = {2019}
}