Multicontact formulation for non-conservative field theories

TL;DR

This paper introduces a novel geometric framework based on multisymplectic and contact geometries to describe non-conservative classical field theories, enabling variational equations in both Lagrangian and Hamiltonian formalisms.

Contribution

It develops a comprehensive multicontact geometric framework for non-conservative field theories, extending existing formalisms to include non-conservative effects with new geometric tools.

Findings

Framework unifies Lagrangian and Hamiltonian formalisms for non-conservative fields.

Variational equations derived using sections, multivector fields, and Ehresmann connections.

Applicable to regular and singular cases within jet bundle descriptions.

Abstract

A new geometric framework is developed to describe non-conservative classical field theories, which is based on multisymplectic and contact geometries. Assuming certain additional conditions and using the forms that define this multicontact structure, as well as other geometric elements that are derived from them, we can introduce variational field equations in the multicontact manifolds. These equations are stated using different geometric tools; namely, sections, multivector fields and Ehresmann connections in fiber bundles. Then, this framework can be adapted to the jet bundle description of classical field theories and the field equations are stated both in the Lagrangian and the Hamiltonian formalisms, which are discussed in the regular and the singular cases.