Cosmological perturbations in antigravity

@article{Oltean2014CosmologicalPI,
  title={Cosmological perturbations in antigravity},
  author={Marius Oltean and Robert Brandenberger},
  journal={Physical Review D},
  year={2014},
  volume={90},
  pages={083505}
}
We compute the evolution of cosmological perturbations in a recently proposed Weyl-symmetric theory of two scalar fields with oppositely-signed conformal couplings to Einstein gravity. It is motivated from the minimal conformal extension of the Standard Model, such that one of these scalar fields is the Higgs while the other is a new particle, the dilaton, introduced to make the Higgs mass conformally symmetric. At the background level, the theory admits novel geodesically-complete cyclic… 
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