Plain Definition
What is simulation theory in physics?
Simulation theory is the idea that physical reality may arise from a deeper information process. OPH explores a concrete version of that idea: finite local systems make records, compare what they share, repair disagreements, and form the public physics we measure. It begins with no fitted numerical inputs.
The OPH version treats simulation theory as a physics proposal about information, records, and stable agreement. The technical papers define the detailed mathematical structures and tests.
One local mathematical closure calculation has a verified solution. No link from that solution to a measured physical quantity is derived. A separate proposal asks whether the capacity of shared records could relate to the cosmological constant. That proposal has no selected physical value and makes no prediction.