Classical and quantum dynamics of higher-derivative systems
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Publication:4597884
DOI10.1142/S0217751X17300253zbMATH Open1391.70064arXiv1710.11538MaRDI QIDQ4597884
Author name not available (Why is that?)
Publication date: 14 December 2017
Published in: (Search for Journal in Brave)
Abstract: A brief review of the physics of systems including higher derivatives in the Lagrangian is given. All such systems involve ghosts, i.e. the spectrum of the Hamiltonian is not bounded from below and the vacuum ground state is absent. Usually this leads to collapse and loss of unitarity. In certain special cases, this does not happen, however: ghosts are benign. We speculate that the Theory of Everything is a higher-derivative field theory, characterized by the presence of such benign ghosts and defined in a higher-dimensional bulk. Our Universe represents then a classical solution in this theory, having the form of a 3-brane embedded in the bulk.
Full work available at URL: https://arxiv.org/abs/1710.11538
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