Authors: Arieh Sher
The Hubble crisis refers to the persistent discrepancy between the locally measured Hubble constant (H0≈73 km/s/u2009Mpc) and the value inferred from early-Universe observations of the cosmic microwave background (H0≈67 km/u2009s/u2009Mpc) within the standard ΛCDM framework. Some believe that this discrepancy is due to a flaw in our instruments or in how we measure stars. For them, it’s a tension that is currently being settled. I think that this is a crisis because it challenges ΛCDM and its main assumption that a single, spatially uniform expansion rate characterizes the Universe at all epochs and locations. The Pivot Universe (PU) model resolves this discrepancy by abandoning the notion of a global Hubble constant. In PU, the observable Universe resides in a rotating Kerr-like spacetime generated by a massive central Pivot. Cosmological redshifts are interpreted primarily as gravitational and frame-dragging effects rather than metric expansion. The quantity identified observationally as the Hubble constant becomes a position-dependent effective parameter, Heff(r), which varies with radial distance from the Pivot according to Kerr frame-dragging dynamics.In this framework, the Hubble crisis is resolved without invoking new fields, modified gravity, or early dark energy, but by reinterpreting cosmological redshift within standard general relativity applied on a global Kerr background.
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