Comparative Analysis of the String Theory, Loop Quantum Gravity and Krikos Model in Modern Quantum Cosmology

The unification of General Relativity and Quantum Mechanics remains the most formidable challenge in theoretical physics. This paper provides a comprehensive, comparative analysis between the two dominant paradigms—String Theory and Loop Quantum Gravity (LQG)—and the emerging alternative framework known as the Krikos Model. We systematically evaluate these three approaches across thirteen fundamental foundational categories, ranging from the sub-atomic structure of matter to the large-scale mechanics of cosmological constants, black holes, and time. While String Theory introduces multi-dimensional vibrating strings within an external background, and LQG hypothesizes a discrete, background-independent spin network, the Krikos Model introduces a radically different philosophical approach: a purely geometric and informational universe projected from a discrete 2D plane boundary.