Unitarity in a Lorentz symmetry breaking model with higher-order operators

Unitarity in a Lorentz symmetry breaking model with higher-order operators

We analyze the unitarity of a modified QED with higher-order terms that violate Lorentz symmetry. We make an explicit calculation to verify unitarity at the one-loop level. As expected we find negative-norm states that could in principle lead to a violation of unitarity. However, we show that these...

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Veröffentlicht in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2014-03, Vol.89 (5), Article 056009
Hauptverfasser: Maniatis, Markos, Reyes, Carlos M.
Format: Artikel
Sprache:eng
Schlagworte:
Broken symmetry
Cosmology
Discontinuity
Euclidean geometry
Gravitation
Mathematical models
Operators
Symmetry
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Zusammenfassung:We analyze the unitarity of a modified QED with higher-order terms that violate Lorentz symmetry. We make an explicit calculation to verify unitarity at the one-loop level. As expected we find negative-norm states that could in principle lead to a violation of unitarity. However, we show that these states become massive in Euclidean space and do not contribute to the discontinuity.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.89.056009