Observational Study of the Deceleration Parameter in <i>f</i>(<i>R</i>, <i>L<sub>m</sub></i>) Theory of Gravity

Shukla B. K., SOFUOĞLU D., Beesham A., Ouguergouz A., Shukla S. N.

GRAVITATION & COSMOLOGY, cilt.31, sa.1, ss.71-81, 2025 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 1
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1134/s0202289324700518
  • Dergi Adı: GRAVITATION & COSMOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, zbMATH
  • Sayfa Sayıları: ss.71-81
  • İstanbul Üniversitesi Adresli: Evet

Özet

We investigate the implications of the modified gravity theory f(R, L-m) on the cosmological evolution. By examining the nonlinear model f(R, L-m) = R/2+ (alpha R + 1)L-m, we explore the impact of a nonminimal coupling between curvature and matter on the cosmic expansion. Using a parametrized deceleration parameter dependent on the redshift z, we analyze the Friedmann-Lemaitre-Robertson-Walker (FLRW) universe in the f(R, L-m) framework. Through observational constraints derived from Cosmic Chronometers (CC), Type Ia Supernovae (SNIa), and Baryon Acoustic Oscillations (BAO), we perform a detailed comparison with the standard Lambda CDM model. Our results show that the f(R, L-m) model is consistent with observational data, but deviations from the Lambda CDM model emerge in its geometric structure, highlighting the potential of f(R, L-m) gravity in explaining the dark energy and cosmic acceleration.