AI Networking Cookbook: Practical recipes for AI-assisted network automation and development
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The superselection-rule approach to ghost theories is extended to theories with a nonreal spectrum containing a complex-conjugate pair of poles on the physical sheet. The two excitations are labeled by their respective complex masses, $M$ and $M^*$, and the superselection sectors are labeled by $n$, the difference betw...
A superselection rule based on an exact ghost parity can endow a ghost QFT with a probability interpretation. However, this ghost parity is not respected at finite order in the standard perturbative expansion. A ghost-parity-preserving perturbation theory (Z$_2$PT) is obtained through a similarity transformation of the...
Quantum field theories with ghosts can be unitary and perturbatively stable, yet the negative-norm states of their conserved indefinite inner product obstruct a probabilistic interpretation. This problem is especially relevant to renormalizable quantum gravity. The focus of this paper is the real-spectrum regime, in wh...
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