Exciting the scalar ghost mode through time evolution

Sohyun Park and R. P. Woodard
Phys. Rev. D 99, 024014 – Published 8 January 2019

Abstract

A nonlocal gravity model based on 1R achieves the phenomenological goals of generating cosmic acceleration without dark energy and suppressing the growth of perturbations compared to the ΛCDM model. Although the localized version of this model possesses a scalar ghost, the nonlocal version does not suffer from any obvious problem with ghosts. Here we study the possibility that the scalar ghost mode might be uncontrollably excited through time evolution, even though it is initially absent. We present strong evidence that this does not happen, so the analogy is with the conformal mode of general relativity which can be excited but only in a controlled way.

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  • Received 21 September 2018

DOI:https://doi.org/10.1103/PhysRevD.99.024014

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsParticles & Fields

Authors & Affiliations

Sohyun Park1,* and R. P. Woodard2,†

  • 1CEICO, Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague 8 Czech Republic
  • 2Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • *park@fzu.cz
  • woodard@phys.ufl.edu

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Issue

Vol. 99, Iss. 2 — 15 January 2019

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