Low energy ghosts and the Jeans’ instability

Gümrükçüoğlu, A. Emir and 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
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: https://doi.org/10.1103/PhysRevD.94.064001
Depositing User: Eprints, Support
Date Deposited: 21 Dec 2016 14:10
Last Modified: 18 Feb 2017 17:38
URI: http://eprints.nottingham.ac.uk/id/eprint/39500

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