COSMOLOGICAL DIAGNOSTICS OF BIANCHI TYPE-II BARROW HOLOGRAPHIC DARK ENERGY UNIVERSE; [????????I??? ?I????????? ????????I???? ?????? ?????I? ?????I?? ?????? ???? ?I???I-II]
Barrow holographic dark energy; Bianchi type-II model; Cosmology; Dark energy; Modified theory of gravity
In this paper, we investigate a Bianchi type II anisotropic cosmological model in the framework of Barrow holographic dark energy, considering both the Hubble horizon and GrandaOliveros scale as infrared cutoffs. To obtain exact solutions of the Einstein field equations, we assume a suitable relation between the metric potentials. Using Hubble cosmic chronometer data, we constrain the model parameters and obtain the best-fit values b4= ?0.091+0.013 ?0.012and H0= 72.32.7 km s?1Mpc?1The H(z) fit shows excellent agreement with observational data and overlaps with ?CDM at low redshifts, with mild deviations at higher z. The physical behaviour of the model is examined through a detailed analysis of cosmological parameters. The deceleration parameter q(z) reveals a smooth transition from an early decelerating phase to the present accelerating epoch. The equation of state parameter ?deshows quintom-like dynamics, evolving across the cosmological constant boundary and entering the phantom regime, consistent with late-time acceleration. Stability is tested using the squared sound speed vs2, which remains positive in the recent Universe, ensuring classical stability. The ?de?dephase plane indicates that both models lie in the freezing region, corresponding to faster acceleration. The statefinder diagnostics (r,s) and (r,q) further confirm the transition from the standard cold dark matter dominated phase to a de Sitter-like attractor, with trajectories showing clear deviations from ACDM. U.Y.D. Prasanthi, D. Tejeswararao, Diddi Srinivasa Rao, Y. Aditya, D. Ram Babu, 2026.
Prasanthi, U.Y. Divya; Tejeswararao, D.; Srinivasa Rao, Diddi; Aditya, Y.; Ram Babu, D.
East European Journal of Physics;Volume;2026;Issue;1;pp.60-75
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.26565/2312-4334-2026-1-05 https://www.scopus.com/pages/publications/105035841635?origin=resultslist
Prasanthi U.Y.D., Department of Statistics & Mathematics, College of Horticulture, Dr. Y.S.R. Horticultural University, Parvathipuram, 535502, India; Tejeswararao D., Department of Basic Sciences and Humanities, GMR Institute of Technology (GMRIT), Deemed to be University, Rajam, 532127, India; Srinivasa Rao D., Department of Mathematics, Aditya University, Surampalem, 533437, India; Aditya Y., Department of Mathematics, GMR Institute of Technology (GMRIT), Deemed to be University, Rajam, 532127, India; Ram Babu D., Department of Mathematics, GMR Institute of Technology (GMRIT), Deemed to be University, Rajam, 532127, India