Geodesic
FRW viscous cosmological model with time periodically varying deceleration parameter in $\mathrm{f(R,T)}$ gravity
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 18 (2025) no. 2, pp. 243-252.

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This research paper investigates the dynamics of a Friedmann–Robertson–Walker cosmological model characterized by perfect fluid pressure and barotropic bulk viscous pressure. By obtaining exact solutions to Einstein's field equations with a time-varying periodic deceleration parameter, the study reveals periodic behaviour in most parameters, attributed to the influence of a cosine function in the deceleration parameter. The analysis delves into the physical and dynamical implications of this model, particularly highlighting how negative pressure contributes to the late-time expansion of the universe.
Keywords: bulk viscous fluid, time period, decelerating parameter, accelerating expansion. 
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M. Ramanamurty; Rajamahanthi Santhikumar; K. Sobhanbabu. FRW viscous cosmological model with time periodically varying deceleration parameter in $\mathrm{f(R,T)}$ gravity. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 18 (2025) no. 2, pp. 243-252. http://geodesic.mathdoc.fr/item/JSFU_2025_18_2_a9/

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