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Benign vs. Malicious Ghosts in Theories by fisicofabricio is a document available to read on EtoBox.

This document discusses higher-derivative theories that involve ghosts at the classical level but may have stable vacuums with respect to small perturbations. It presents a toy classical mechanical model with quartic derivatives that is stable for small fluctuations but unstable at higher amplitudes, representing a "benign" type of instability. The document argues that some higher-derivative field theories, like a 6D Yang-Mills theory, could similarly be stable for small fluctuations with nonzero momenta wh

Author

fisicofabricio

Language

EN