Abstraction, Explanation, and Effective Field Theories

Effective field theories (EFTs) are widely considered by physicists to be explanatory and to be the appropriate frameworks for modelling various phenomena at different scales. At the same time, they are known to be approximate, restricted, and merely effective, and thus, examining them can provide a means of getting traction on philosophical issues such as idealisation, abstraction, and the veridicality of representations in explanation. This paper casts EFTs as abstract models of a more fundamental theory that retain all and only the relevant aspects for a given explanandum. I describe abstraction as a process that can preserve explanation top-down from an independently explanatory fundamental theory to an effective theory. Thus the paper aims to show how abstract models, like EFTs, can function as explanatory stand-ins for more fundamental models, something often taken to be unproblematic.