Low energy ghosts and the Jeans’ instabilityTools 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 Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevD.94.064001
AbstractWe 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.
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