The authors of model-dependent realism claim that what type of theory may not exist?
The Grand Design (book) The Grand Design is a popular-science book written by physicists Stephen Hawking and Leonard Mlodinow and published by Bantam Books in 2010. The book examines the history of scientific knowledge about the universe and explains 11 dimension M-theory. The authors of the book point out that a Unified Field Theory (a theory, based on an early model of the universe, proposed by Albert Einstein and other physicists) may not exist.
Transcendental realism Initially developed by Roy Bhaskar in his book "A Realist Theory of Science" (1975), transcendental realism is a philosophy of science that was initially developed as an argument against epistemic realism of Positivism and Hermeneutics. The position is based on Bhaskar's transcendental arguments for certain ontological and epistemological positions based on what reality must be like in order for scientific knowledge to be possible. While Bhaskar's work is the origin of transcendental realism, it is based upon and further developed by a number of other authors[ref: Collier, Sayer, Lawson, Critical Realism: Essential Readings, etc. The overview of transcendental realism that follows is largely based on Andrew Sayer's "Realism and Social Science".