English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Torsion is a non-Riemannian geometrical extension of general relativity thatallows including the spin of matter and the twisting of spacetime. Cosmologicalmodels with torsion have been considered in the literature to solve problems ofeither the very early (high redshift $z$) or the present-day Universe. Thispaper focuses on distinguishable observational signatures of torsion that couldnot be otherwise explained with a scalar field in pseudo-Riemannian geometry.We show that when torsion is present, the cosmic duality relation between theangular diameter distance, $D_{\mathrm A}$, and the luminosity distance,$D_{\mathrm L}$, is broken. We show how the deviation described by theparameter $\eta = D_{\mathrm L}/[ D_{\mathrm A}(1+z)^2] -1 $ is linked totorsion and how different forms of torsion lead to special-caseparametrisations of $\eta$, including $\eta_0 z$, $\eta_0 z/(1+z)$, and $\eta_0\ln (1+z)$. We also show that the effects of torsion could be visible inlow-redshift data, inducing biases in supernovae-based $H_0$ measurements. Wealso show that torsion can impact the Clarkson-Bassett-Lu (CBL) function ${\calC}(z) = 1 + H^2 (D D'' - D'^2) + H H' D D'$, where $D$ is the transversecomoving distance. If $D$ is inferred from the luminosity distance, then, ingeneral non-zero torsion models, ${\cal C}(z) \ne 0$. For pseudo-Riemanniangeometry, the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric has ${\calC}(z) \equiv 0$; thus, measurement of the CBL function could provide anotherdiagnostic of torsion.

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