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<p>particle physics, such as the high energy behavior of <a href="page.php?w=quantum_field_theory">quantum field theory</a>, <a href="page.php?w=symmetry_breaking">symmetry breaking</a>, <a href="page.php?w=pion">pion</a> scattering, infrared photons and <a href="page.php?w=quantum_gravity">quantum gravity</a> (<a href="page.php?w=soft_graviton_theorem">soft graviton theorem</a>). It was also during this time that he developed the approach to quantum field theory described in the first chapters of his book The Quantum Theory of Fields and started</p><p>
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