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Cosmological Distances And Hubble Tension In Einstein-Cartan Theory

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arxiv 2305.00415 v2 pith:OHNNEAWK submitted 2023-04-30 gr-qc

Siamak Akhshabi , Saboura Zamani This is my paper · ORCID
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keywords hubbleparametercosmologicaltensiondistanceseinstein-cartanlensingmeasurements
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We analyze the measurement of cosmological distances in the presence of torsion in both Einstein-Cartan and Poincare gauge theory of gravity. Using the modified cosmological distance measurements, we use the observed time delays in gravitational lensing systems to determine the Hubble parameter. The results show the measured Hubble parameter from a lensing system can be less than its expected value in General Relativity for certain models of torsion and its associated density parameter. This can reduce the tension between late-time and early-universe measurements of the Hubble parameter, the so-called Hubble tension.

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    For a class of hyperfluid models in metric-affine gravity, the FLRW evolution of H(t) and rho(t) keeps the general relativity form, with hypermomentum effects encoded only in modified barotropic indices.

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