3 papers
hep-th2025
Nonlocal Mechanics
Carlos Heredia, Josep Llosa
We introduce a Hamiltonian framework for nonlocal Lagrangian systems without relying on infinite-derivative expansions. Starting from a (trajectory-based) variational principle and…
hep-th2025
Are nonlocal Lagrangian systems fatally unstable?
Carlos Heredia, Josep Llosa
We prove that higher-derivative and genuinely nonlocal Lagrangian systems can be Lyapunov-stable even when their Hamiltonians lack a lower bound. Explicit free and coupled Pais-Uhl…
hep-th2024
Infinite Derivatives vs Integral Operators. The Moeller-Zwiebach Puzzle
Carlos Heredia, Josep Llosa
We study the relationship between integral and infinite-derivative operators. In particular, we examine the operator that appears in the theory of …