# Species doubling and effective Lagrangians

## TL;DR

This paper discusses how coupling gauge fields to chiral currents in an effective meson Lagrangian leads to a species doubling phenomenon akin to that observed in lattice fermion theories.

## Contribution

It reveals a species doubling issue in effective meson Lagrangians when gauge fields are coupled to chiral currents, paralleling lattice fermion problems.

## Key findings

- Species doubling occurs in effective meson Lagrangians with gauge coupling.
- The phenomenon mirrors lattice fermion species doubling.
- Implications for modeling chiral gauge theories with mesons.

## Abstract

Coupling gauge fields to the chiral currents from an effective Lagrangian for pseudoscalar mesons naturally gives rise to a species doubling phenomenon similar to that seen with fermionic fields in lattice gauge theory.