Real-time cosmography with redshift derivatives

Martins, C. J. A.P., Martinelli, M., Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068 and Ramos, M. P. L. P. 2016. Real-time cosmography with redshift derivatives. Physical Review D 94 (4) , 043001. 10.1103/PhysRevD.94.043001

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Abstract

The drift in the redshift of objects passively following the cosmological expansion has long been recognized as a key model-independent probe of cosmology. Here, we study the cosmological relevance of measurements of time or redshift derivatives of this drift, arguing that the combination of first and second redshift derivatives is a powerful test of the ΛCDM cosmological model. In particular, the latter can be obtained numerically from a set of measurements of the drift at different redshifts. We show that, in the low-redshift limit, a measurement of the derivative of the drift can provide a constraint on the jerk parameter, which is j=1 for flat ΛCDM, while generically j≠1 for other models. We emphasize that such a measurement is well within the reach of the ELT-HIRES and SKA Phase 2 array surveys.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2470-0010
Date of First Compliant Deposit:	20 July 2017
Date of Acceptance:	21 July 2016
Last Modified:	06 May 2023 09:45
URI:	https://orca.cardiff.ac.uk/id/eprint/102681

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