Low energy ghosts and the Jeans’ instability
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 th...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Published: |
American Physical Society
2016
|
| Online Access: | https://eprints.nottingham.ac.uk/39500/ |