 Primary field

A primary operator of weights $(h,\tilde{h})$ transforms covariantly under local conformal maps and has a universal operator-product expansion with the stress-energy tensor.

The term "primary field" can refer to different concepts depending on the context in which it's used. Here are a few interpretations: 1. **Data Management**: In databases, a primary field (or primary key) is a unique identifier for each record in a table. It ensures that each entry can be uniquely identified and accessed, preventing duplicates.