Cosmic acceleration in f(Q) gravity: a nonlinear equation of state approach

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Özansoy M., Shukla B. K., SOFUOĞLU D., Beesham A., Tripathi R.

European Physical Journal C, vol.86, no.2, 2026 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 86 Issue: 2
  • Publication Date: 2026
  • Doi Number: 10.1140/epjc/s10052-026-15310-1
  • Journal Name: European Physical Journal C
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, Directory of Open Access Journals, Nature Index
  • Istanbul University Affiliated: Yes

Abstract

We investigate late-time cosmic acceleration within the framework of f(Q) gravity supplemented by a phenomenological nonlinear equation of state of the form p=Aρ-Bρ. Adopting a power-law ansatz f(Q)=γ,(Q/Q0)n, we derive analytic expressions for the energy density and Hubble function and confront the model with a combined dataset consisting of CC, SNIa, BAO, quasar, and GRB observations covering 0.106