Interested in whatever that can be linked to QFT.
Physics
Q&A for active researchers, academics and students of physics
Academia
Q&A for academics and those enrolled in higher education
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Psychology & Neuroscience
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Islam
Q&A for Muslims, experts in Islam, and those interested in learning more about Islam
Mathematics
Q&A for people studying math at any level and professionals in related fields
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
English Language Learners
Q&A for speakers of other languages learning English
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Stack Overflow
Q&A for professional and enthusiast programmers