Low energy ghosts and the Jeans’ instability

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Gümrükçüoğlu, A. Emir, Mukohyama, Shinji and Sotiriou, Thomas P. (2016) Low energy ghosts and the Jeans’ instability. Physical Review D, 94 (6). 64001/1-64001/6. ISSN 2470-0029

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Abstract

We show that a massless canonical scalar field minimally coupled to general relativity can become a tachyonic ghost at low energies around a background in which the scalar’s gradient is spacelike. By performing a canonical transformation we demonstrate that this low energy ghost can be recast, at the level of the action, in a form of a fluid that undergoes a Jeans-like instability affecting only modes with large wavelength. This illustrates that low energy tachyonic ghosts do not lead to a catastrophic quantum vacuum instability, unlike the usual high-energy ghost degrees of freedom.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/802869
Additional Information: ©2016 American Physical Society
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1103/PhysRevD.94.064001
Depositing User: Eprints, Support
Date Deposited: 21 Dec 2016 14:10
Last Modified: 04 May 2020 18:04
URI: https://eprints.nottingham.ac.uk/id/eprint/39500

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