See the original project this is forked from for a thorough description and relevant papers https://github.com/jaeminoh/Siren_PINNs.
This forked repository was used as a chance for me to learn about PINNs by attempting to solve a 2D Helmholtz equation.
Helmholtz equation with point source
Helmholtz equation with point source and dielectric, circular scatterer at the center
