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<p>In modern physics, all fundamental particles are regarded as excitations of <a href="page.php?w=Quantum_field_theory">quantum fields</a>. There are several distinct ways in which tachyonic particles could be embedded into a field theory.</p>

<p><big> Fields with imaginary mass </big></p>
<p>In the paper that coined the term "tachyon", Gerald Feinberg studied Lorentz invariant quantum fields with <a href="page.php?w=imaginary_mass">imaginary mass</a>. Because the <a href="page.php?w=group_velocity">group velocity</a> for such a field is <a href="page.php?w=Superluminal_motion">superluminal</a>,</p><p>
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