A Does an interface necessarily satisfy the KPZ Equation?

[AspiringResearcher]

Does an interface between two different phases necessarily satisfy the KPZ equation if the interface is in the KPZ universality class?

 

[nbryan5]

No, an interface between two different phases does not necessarily satisfy the KPZ equation if the interface is in the KPZ universality class. This is because the KPZ equation is a specific case of a more general equation known as the Kardar-Parisi-Zhang equation. This equation describes a wide range of processes, and the specific form of the equation used to describe a given process depends on the particular details of that process. Therefore, even if an interface is in the KPZ universality class, it may not necessarily satisfy the KPZ equation.