Gravitational potentials and forces in the Lattice Universe: a slab Maxim Eingorn, Niah O’Briant, Katie Arzu, Maxim Brilenkov and Alexander Zhuk Eur. Phys. J. Plus, 136 2 (2021) 205 Published online: 12 February 2021 DOI: 10.1140/epjp/s13360-021-01139-y