The authors of model-dependent realism claim that what type of theory may not exist?
Model-dependent realism Model-dependent realism is a view of scientific inquiry that focuses on the role of scientific models of phenomena. It claims reality should be interpreted based upon these models, and where several models overlap in describing a particular subject, multiple, equally valid, realities exist. It claims that it is meaningless to talk about the "true reality" of a model as we can never be "absolutely" certain of anything. The only meaningful thing is the usefulness of the model. The term "model-dependent realism" was coined by Stephen Hawking and Leonard Mlodinow in their 2010 book, "The Grand Design".
Postinternationalism Postinternationalism is a term coined by academic James N. Rosenau to describe "an apparent trend in which more of the interactions that sustain world politics unfold without the direct involvement of states". Postinterational approaches to international relations theory emphasis the role of non-state actors, the existence of international norms as well as the process of globalisation and the existence of intra-state (rather than interstate) violence. As such postinternational approaches rejects many the tenets of realist approaches to international relations theory though it accepts that international politics is anarchic. Rosneau's paradigm of postinternationalism is sometimes referred to in academic literature as "turbulence theory".