An extensive universe avoids phantom dark energy
astro-ph.GA
Submitted: 2025-06-05
Updated: 2026-09-10
Comments: 24 pages, 1 figure
License: http://creativecommons.org/licenses/by/4.0/
The gist: A major challenge in cosmology and astrophysics is the phantom dark energy used to explain the data of DESI DR2 BAO.
Terminology
Abstract
A major challenge in cosmology and astrophysics is the phantom dark energy used to explain the data of DESI DR2 BAO. Assuming that the degrees of freedom of the universe are (d=3) extensive, we find that the linearised Hubble parameter in Tsallis Entropic cosmology is consistent with Cosmic Chronometers (CC) and DESI DR2 data upto z<2.33, avoiding the need for phantom energy while keeping the observed CMB acoustic angular scale constraint. It also obviates the need for a significant density of CDM.
Sources
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- A small and vigorous black hole in the early Universe
- Alternative ideas in cosmology
- Variable Modified Newtonian Mechanics IV: Non Rotating Galaxies
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- Extensive Composable Entropy for the Analysis of Cosmological Data
- The Area of a Rough Black Hole
- Emergence and Expansion of Cosmic Space as due to the Quest for Holographic Equipartition
- Cosmological Tensions with Non-Extensive Entropic Cosmology: A Modified Stress-Energy Approach
- The Cosmological Parameters
- The 2024 BBN baryon abundance update
- Status Report on the Chicago-Carnegie Hubble Program (CCHP): Measurement of the Hubble Constant Using the Hubble and James Webb Space Telescopes
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