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

Applying the Sachs formalism, the optical properties encoded in the distancemodulus are studied along curves exhibiting local rotational symmetry for someclosed inhomogeneous cosmological models whose mass content is discretized bySchwarzschild-like sources. These models may challenge the concordance model inits use of the distance modulus data of type Ia supernovae, because they do notviolate any energy condition. This result relies only on the symmetryproperties considered, and not on the way in which the mass is discretized. Themodels with different number of sources are then compared among themselves andwith a Friedmann-Lemaitre-Robertson-Walker model with the same total masscontent by introducing a compactness parameter. The analysis shows thatobservational backreaction occurs because increasing the number of sources thefeatures of a universe with a continuous matter distribution are not recovered.Our models are shown to exhibit a non-trivial relationship between kinematical,dynamical and observational backreactions, the kinematical one beingasymptotically decreasing while the latter two are present. Furthermore, theelectric part of the Weyl tensor contributes to the luminosity distance byaffecting the evolution of the scale factor, while the magnetic part has anindirect role by affecting only the evolution of the former

Observational backreaction in discrete black holes lattice cosmological models