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Accelerating f(T) gravity models constrained by recent cosmological data

Vincenzo F. Cardone*

Ninfa Radicella†

Stefano Camera‡

  • I.N.A.F.—Osservatorio Astronomico di Roma, via Frascati 33, 00040-Monte Porzio Catone (Roma), Italy

  • Dipartimento di Fisica “E.R. Caianiello,” Università di Salerno and I.N.F.N.—Sezione di Napoli, GC di Salerno, Via Ponte Don Melilo, 84081 Fisciano (Sa), Italy

  • CENTRA, Instituto Superior Técnico, Universidade Técnica de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal

  • *winnyenodrac@gmail.com
  • †ninfa.radicella@gmail.com
  • ‡stefano.camera@ist.utl.pt
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Phys. Rev. D 85, 124007 – Published 4 June, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.124007

Abstract

Generalized teleparallel gravity, also referred to as f(T) gravity, has been recently proposed as an extended theory of gravitation able to give rise to an accelerated expansion in a matter-only universe. The cosmic speedup is driven by an effective torsion fluid whose equation of state depends on the f(T) function entering the modified gravity Lagrangian. We focus on two particular choices for f(T) which share the nice property of emulating a phantom divide crossing as suggested by some recent data. We check their viability, contrasting the predicted background dynamics with the Hubble diagram as traced by both type Ia supernovae and gamma ray bursts, the measurement of the rate expansion H(z), the baryon acoustic oscillations at different redshifts, and the cosmic microwave background radiation distance priors. Both f(T) models turn out to be in very good agreement with this large data set, so we also investigate whether it is possible to discriminate among them, relying on the different growth factors.

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See Also

Detectability of torsion gravity via galaxy clustering and cosmic shear measurements

Stefano Camera, Vincenzo F. Cardone, and Ninfa Radicella
Phys. Rev. D 89, 083520 (2014)

Article Text

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Phys. Rev. D 85, 124007– Published 4 June, 2012
  • Received 29 February 2012

© 2012 American Physical Society

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