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<p>which specifically deals with <a href="page.php?w=quantum_electrodynamics">quantum electrodynamics</a> (e.g., electromagnetic interactions between photons, electrons and the vacuum) or the <a href="page.php?w=QCD_vacuum">QCD vacuum</a> which deals with <a href="page.php?w=quantum_chromodynamics">quantum chromodynamics</a> (e.g., <a href="page.php?w=color_charge">color charge</a> interactions between quarks, gluons and the vacuum). A vacuum can be viewed not as empty space but as the combination of all zero-point fields. In <a href="page.php?w=quantum_field_theory">quantum field theory</a></p><p>
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