Negative-frequency modes in quantum field theory

Research output: Contribution to journalConference articlepeer-review


We consider a departure from standard quantum field theory, constructed so as to permit momentum eigenstates of both positive and negative energy. The resulting theory is intriguing because it brings about the cancellation of leading ultra-violet divergences and the absence of a zero-point energy. The theory gives rise to tree-level source-to-source transition amplitudes that are manifestly causal and consistent with standard S-matrix elements. It also leads to the usual result for the oblique corrections to the standard electroweak theory. Remarkably, the latter agreement relies on the breakdown of naive perturbation theory due to resonance effects. It remains to be shown that there are no problems with perturbative unitarity.
Original languageEnglish
Article number012059
Pages (from-to)1-16
Number of pages16
JournalJ. Phys. Conf. Ser.
Issue number1
Publication statusPublished - 30 Jul 2015


Dive into the research topics of 'Negative-frequency modes in quantum field theory'. Together they form a unique fingerprint.

Cite this