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Higher-Derivative Quantum Gravity with Purely Virtual Particles: Renormalizability and Unitarity
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Higher-Derivative Quantum Gravity with Purely Virtual Particles: Renormalizability and Unitarity
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We review the formulation of quantum field theories with purely virtual particles, a new type of degrees of freedom that can mediate interactions without ever appear as external on-shell states. This property allows to solve the problem of ghosts in higher-derivative quantum gravity, leading to a renormalizable and unitary theory. The main steps for the BRST quantization of gravity are recalled and renormalizability is discussed. Then, we introduce purely virtual particles in a general quantum field theory and show the derivation of the so-called spectral identities, which are a key ingredient to prove unitarity. Finally, phenomenological consequences and predictions in inflationary cosmology are presented.
Forward citations
Cited by 2 Pith papers
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Physical nonviability of $f(\mathbb{Q})$ in the scalar-tensor representation
The scalar-tensor representation of f(Q) gravity reproduces the known ghost/strong-coupling obstruction, so the pathology is not an artifact of the original variables.
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Physical nonviability of $f(\mathbb{Q})$ in the scalar-tensor representation
f(Q) gravity exhibits pathological behavior in its scalar-tensor representation.
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