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Theoretical physics is concerned with developing conceptual models of physical phenomena based on empirical evidence, and using mathematical reasoning to make predictions and test hypotheses. In the context of nanotechnology, it encompasses the study of fundamental principles governing matter at atomic and subatomic scales, such as quantum mechanics, statistical mechanics, and condensed matter physics. Theoretical physicists in this domain work on understanding and predicting the properties of novel materials and devices, designing new experiments to probe nanoscale phenomena, and developing computational models to simulate complex systems. By drawing on insights from science and physics more broadly, theoretical physics serves as a foundation for advancing our knowledge and control over matter at the smallest scales.