Gauge-invariant gravitational wave modes in pre-big bang cosmology

@article{Faraoni2010GaugeinvariantGW,
  title={Gauge-invariant gravitational wave modes in pre-big bang cosmology},
  author={V. Faraoni},
  journal={The European Physical Journal C},
  year={2010},
  volume={70},
  pages={363-366}
}
  • V. Faraoni
  • Published 2010
  • Physics
  • The European Physical Journal C
The t<0 branch of pre-big bang cosmological scenarios is subject to a gravitational wave instability. The unstable behaviour of tensor perturbations is derived in a very simple way in Hwang’s covariant and gauge-invariant formalism developed for extended theories of gravity. A simple interpretation of this instability as the effect of an “antifriction” is given, and it is argued that a universe must eventually enter the expanding phase. 

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