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Cosmological signatures of torsion and how to distinguish torsion from the dark sector


Bolejko, K and Cinus, M and Roukema, BF, Cosmological signatures of torsion and how to distinguish torsion from the dark sector, Physical Review D, 101, (10) Article 104046. ISSN 2470-0010 (2020) [Refereed Article]

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© 2020 American Physical Society

DOI: doi:10.1103/PhysRevD.101.104046


Torsion is a non-Riemannian geometrical extension of general relativity that allows including the spin of matter and the twisting of spacetime. Cosmological models with torsion have been considered in the literature to solve problems of either the very early (high redshift 𝓏) or the present-day Universe. This paper focuses on distinguishable observational signatures of torsion that could not be otherwise explained with a scalar field in pseudo-Riemannian geometry. We show that when torsion is present, the cosmic duality relation between the angular diameter distance, DA, and the luminosity distance, DL, is broken. We show how the deviation described by the parameter η = DL/[DA(1 + 𝓏)2] - 1 is linked to torsion and how different forms of torsion lead to special-case parametrizations of η, including η0𝓏, η0𝓏/(1 + 𝓏), and η0ln(1 + 𝓏). We also show that the effects of torsion could be visible in low-redshift data, inducing biases in supernovae-based H0 measurements. We also show that torsion can impact the Clarkson-Bassett-Lu (CBL) function C(𝓏) = 1 + H2(DD" - D'2) + HHDD′, where D is the transverse comoving distance. If D is inferred from the luminosity distance, then, in general, nonzero torsion models, C(𝓏) ≠ 0. For pseudo-Riemannian geometry, the Friedmann-Lemaître-Robertson-Walker metric has C(𝓏) ≡ 0; thus, the measurement of the Clarkson-Bassett-Lu function could provide another diagnostic of torsion.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Bolejko, K (Dr Krzysztof Bolejko)
ID Code:145565
Year Published:2020
Funding Support:Australian Research Council (FT140101270)
Web of Science® Times Cited:4
Deposited By:Physics
Deposited On:2021-07-27
Last Modified:2021-09-02
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