3 years ago

Unitarity of loop diagrams for the ghostlike $1/({k}^{2}−{M}_{1}^{2})−1/({k}^{2}−{M}_{2}^{2})$ propagator

Unitarity of loop diagrams for the ghostlike $1/({k}^{2}−{M}_{1}^{2})−1/({k}^{2}−{M}_{2}^{2})$ propagator
Philip D. Mannheim
With fourth-order derivative theories leading to propagators of the generic ghostlike $1/({k}^{2}−{M}_{1}^{2})−1/({k}^{2}−{M}_{2}^{2})$ form, it would appear that such theories have negative norm ghost states and are not unitary. However on constructing the associated quantum Hilbert space for the f...

Publisher URL: http://link.aps.org/doi/10.1103/PhysRevD.98.045014

DOI: 10.1103/PhysRevD.98.045014

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