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You have reached the website of Jonathan Heckman I am an Associate Professor in the Department of Physics and Astronomy at the University of Pennsylvania. I mainly work on aspects of high energy theoretical physics. More details: Dramatic progress in string theory over the past few decades has produced a suite of powerful tools for addressing conceptual questions connected with quantum field theory and quantum gravity. As an added bonus, string theory also provides a framework for motivated stringy extensions of particle physics. Combining these threads is of central importance in determining the mathematical consistency of string theory, and its potential role as a theory of the real world. The broad questions my work aims to address are: What is quantum field theory, and what are its limitations as a tool in describing Nature? What are the building blocks of matter and spacetime? String theory provides a promising way to address these issues since it is the only known viable approach to unifying quantum theory with gravity. Currently, my efforts are concentrated in three directions: 1) The study of quantum field theory using the extra dimensions of string theory. 2) The study of formal and phenomenological aspects of string compactification, and in particular Ftheory. 3) Conceptual questions connected with the embedding of field theoretic UV cutoffs in string theory. 
