In the late 1920s and early 1930s, the central questions of physics began to change. First was the problem of how to reconcile quantum mechanics with relativity–the search for a relativistic quantum field theory–a question that still occupies physicists today. Heisenberg helped lead the way on this problem, working directly with Pauli. The two proposed a theory in 1929, in a paper entitled "On the Quantum Dynamics of Wave Fields." Their theory was far from complete, however, as it left several matters unresolved.While Heisenberg was struggling with these problems, his father passed away in 1930. Their relationship had become rather distant; while Heisenberg appreciated his father's support, he also became annoyed at his attempts to meddle in his career. Perhaps what moved Heisenberg most at the time of his father's death were feelings of his own mortality. He retreated for a short time from the big questions to pursue teaching and
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