Gravitational waves in non-singular string cosmologies

  • Cartier C
  • Copeland E
  • Gasperini M
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We study the evolution of tensor metric fluctuations in a class of non-singular models based on the string effective action, by including in the perturbation equation the higher-derivative and loop corrections needed to regularise the background solutions. We discuss the effects of such higher-order corrections on the final graviton spectrum, and we compare the results of analytical and numerical computations. © 2001 Elsevier Science B.V.

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  • C. Cartier

  • E. J. Copeland

  • M. Gasperini

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