Lotty – The loop-tree duality automation

Abstract Elaborating on the novel formulation of loop-tree duality, we introduce Mathematica package Lotty that automates latter at multi-loop level. By studying features and recalling former studies, discuss representation any amplitude can be brought in a form, integrand level, only displays physical information, which refer to as causal Feynman integrands. In order elucidate role this automation, recall results obtained for calculation dual integrands up-to four loops. Likewise, within framework, provide support all-loop recently conjectured by same author. The numerical stability generated is studied two-loop planar non-planar topologies, where integration performed compared with known results.