The basic outcome of the considerations is that at least at the level of principle it is possible to determine the classical em fields in the geometric past after a pair of "big" state functions, which are the TGD counterparts of ordinary state function reductions and change the arrow of geometric time. Violations of classical causality based on finite signal velocity would serve as a support for the ZEO.
See the article Double slit experiment in time domain from the TGD perspective or the chapter Zero Energy Ontology.
For a summary of earlier postings see Latest progress in TGD.
For the lists of articles (most of them published in journals founded by Huping Hu) and books about TGD see this.