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Low energy ghosts and the Jeans’ instability

G�mr�k�o?lu, A. Emir; Mukohyama, Shinji; Sotiriou, Thomas P.

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Authors

A. Emir G�mr�k�o?lu

Shinji Mukohyama

THOMAS SOTIRIOU Thomas.Sotiriou@nottingham.ac.uk
Professor of Gravitational Physics



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.

Citation

Gümrükçüoğlu, A. E., Mukohyama, S., & Sotiriou, T. P. (2016). Low energy ghosts and the Jeans’ instability. Physical Review D, 94(6), Article 64001. https://doi.org/10.1103/PhysRevD.94.064001

Journal Article Type Article
Acceptance Date Aug 16, 2016
Publication Date Sep 1, 2016
Deposit Date Dec 21, 2016
Publicly Available Date Dec 21, 2016
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 94
Issue 6
Article Number 64001
DOI https://doi.org/10.1103/PhysRevD.94.064001
Public URL https://nottingham-repository.worktribe.com/output/802869
Publisher URL http://dx.doi.org/10.1103/PhysRevD.94.064001
Additional Information ©2016 American Physical Society
Contract Date Dec 21, 2016

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