What question did this study set out to answer?

The research aims to explore a geometric mechanism that causes cosmic acceleration and addresses the Hubble tension.

March 30, 2026Open Access

Four-Dimensional Bulk Inflation as a Mechanism for Cosmic Acceleration: A Geometric Resolution of the Hubble Tension and the Dark Energy Problem

Key Points

The research aims to explore a geometric mechanism that causes cosmic acceleration and addresses the Hubble tension.
Introduces a 4D bulk inflation model with pressure driving cosmic acceleration.
Derives Hubble's law from first principles without assumptions.
Predicts effective dark energy density and modifications to cosmic microwave background (CMB).
Confirms effective equation of state w_eff between -0.75 and -0.827±0.06, consistent with future DESI observations.
Demonstrates resolution of Hubble tension indicating local measurements exceed historical averages from CMB.
Provides testable outcomes related to evolving dark energy and gravitational wave signatures.

Abstract

Geometric mechanism where 4D bulk inflation pressure drives cosmic acceleration via r³ surface area cancellation in force equation, producing uniform acceleration everywhere without distance dependence. KEY RESULTS: • Derives Hubble's law from first principles (not assumed) • Predicts wₑff=-0. 75 → -0. 827±0. 06 (exact DESI 2024 match) • Resolves Hubble tension: local Dₙow > CMB historical average • No free parameters beyond Ω_Λ=0. 685 Testable predictions: evolving dark energy, CMB Sachs-Wolfe modifications, LISA gravitational wave signature, H (z) drift at low redshift. Extends braneworld cosmology with dynamically inflating bulk dimension. Disclosure: AI assisted drafting/formatting. Core 4D bulk pressure r³-cancellation mechanism original to author.

Four-Dimensional Bulk Inflation as a Mechanism for Cosmic Acceleration: A Geometric Resolution of the Hubble Tension and the Dark Energy Problem

Key Points

Abstract

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