Final answer:
N=2 in theoretical physics typically refers to the number of supersymmetry charges in a model, an important concept in areas like particle physics and string theory. For an undergrad already studying QFT and GR, furthering education in these subjects can lead to a deeper understanding of supersymmetry and its applications.
Step-by-step explanation:
The notation N=2 you've seen, especially used in the context of theoretical physics, likely refers to a type of supersymmetry in quantum field theories. In this context, 'N' denotes the number of supersymmetry charges in a supersymmetric extension of a model—'N=2' means there are two sets of supersymmetry transformations. This is a significant area in theoretical physics as it has implications in particle physics, string theory, and the study of quantum fields. As an undergrad with knowledge of quantum field theory (QFT) and general relativity (GR), you’re well on your way to understanding these advanced concepts. You can increase your understanding by studying more advanced QFT, supersymmetric theories, and string theory classes or textbooks, which delve into the role of supersymmetry in physics and its potential in unifying forces and particles.