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Using a joint statistical analysis with the Pantheon+ Type Ia Supernova compilation and Baryon Acoustic Oscillation (BAO) measurements, we tightly constrain the parameter","authors_text":"Gilberto Aguilar-P\\'erez, Miguel Cruz, Samuel Lepe","cross_cats":[],"headline":"Unimodular gravity with spatial curvature and a power-law diffusion term alleviates the Hubble tension to H0 ≈ 73.35 km/s/Mpc while keeping cosmic age at 13.61 Gyr.","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2026-05-16T02:08:01Z","title":"Spatial curvature in Unimodular Gravity"},"references":{"count":34,"internal_anchors":1,"resolved_work":34,"sample":[{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":1,"title":"Modified Friedmann Equations with Spatial Curvature In the context of a FLRW universe with spatial curvaturekand a single fluid description, the field equations of UG lead to a modified expansion hist","work_id":"34dd8b2e-89ba-4a56-bd41-4b6e1d37ddfd","year":2023},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":2,"title":"In Figure 6, we present the dimensionless diffusion functionQ(z)/H2 0 reconstructed 20 via GPs for a closed universe using our best-fit curvature parameter (Ωk0 =−0.109)","work_id":"0fd95bc0-5a81-4d14-8313-79d4dad6e81a","year":null},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"The cosmological constant problem,","work_id":"649f05cd-7644-4ed4-bb42-af034e528a6c","year":1989},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"Diffusion in unimodular gravity: Analytical solutions, late-time acceleration, and cosmological constraints,","work_id":"482de9df-c46d-49c9-b096-bdfe65c6fd4d","year":2020},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"I. Prigogine, J. Geheniau, E. Gunzig and P. Nardone, “Thermodynamics and cosmology,” Gen. Rel. 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