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Beyond ΛCDM with a logistic RG-like flow of the low redshift cosmic evolution

Shibendu Gupta Choudhury* and Anjan A. Sen†

  • *Contact author: pdf.schoudhury@jmi.ac.in
  • †Contact author: aasen@jmi.ac.in
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Phys. Rev. D 114, 043524 – Published 13 August, 2026

DOI: https://doi.org/10.1103/js6x-6lvq

Abstract

Recent observations hint at possible late-time deviations from Λ cold dark matter (ΛCDM) paradigm. We introduce a minimal phenomenological framework in which the total equation of state wT(z) follows a logistic evolution motivated by renormalization-group-like flow between cosmological fixed points. Using the baryon acoustic oscillation measurements from the Dark Energy Spectroscopic Instrument data release 2, Dark Energy Survey supernova data, and cosmic microwave background distance priors, we find that this parametrization provides an improved description of the expansion history relative to ΛCDM. The reconstructed evolution, though model specific, also shows statistically strong low redshift deviations from ΛCDM.

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Phys. Rev. D 114, 043524– Published 13 August, 2026
  • Received 20 March 2026
  • Accepted 6 July 2026
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