The complementarity of the redshift drift

Abstract : We derive some basic equations related to the redshift drift and we show how some dark energy (DE) properties can be retrieved from it. We consider in particular three kinds of DE models which exhibit a characteristic signature in their redshift drift while no such signature would be present in their luminosity-distances: a sudden change of the equation of state parameter w_{DE} at low redshifts, oscillating DE and finally an equation of state with spikes at low redshifts. Accurate redshift drift measurements would provide interesting complementary probes for some of these models and for models with varying gravitational coupling. While the redshift drift would efficiently constrain models with a spike at z~1, the signature of the redshift drift for models with large variations at very low redshifts z<0.1 would be unobservable, allowing a large arbitrariness in the present expansion of the universe.
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Contributeur : L2c Aigle <>
Soumis le : vendredi 14 octobre 2011 - 17:20:56
Dernière modification le : jeudi 11 janvier 2018 - 06:23:20

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  • HAL Id : hal-00632611, version 1
  • ARXIV : 1110.2525



Bruno Moraes, David Polarski. The complementarity of the redshift drift. L2C:11-206. Accepted for publication in Phys. Rev. D; 12 pages, 8 figures. 2011. 〈hal-00632611〉



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