Abstract Details
| Name: Suraj Kumar Pati Affiliation: P.G. Department of Physics, Fakir Mohan University, Remuna, Balasore. Conference ID: ASI2025_514 Title : Cosmological Dynamics and Accelerated Expansion in Starobinsky-Type Metric f(R) Gravity Authors and Co-Authors : Suraj Kumar Pati 1, Bibekananda Nayak 1 Abstract Type : Poster Abstract Category : Galaxies and Cosmology Abstract : The discovery of accelerated expansion of the universe has become one of the most profound phenomena in modern cosmology. To account for this unexpected observation, two primary approaches are widely discussed in the scientific literature. The first approach involves postulating the existence of an unknown form of energy with negative pressure, referred to as "dark energy". But its nature and origin remain largely unknown and extend beyond the explanatory power of general relativity. The second approach seeks to explain accelerated expansion by modifying the fundamental theory of gravity itself. In this framework, alternative gravitational theories aim to account for observed cosmic acceleration without invoking dark energy. Due to the unresolved nature of dark energy, these modified gravity theories have gained attention as a promising alternative for explaining the accelerated expansion of the universe In the present work, we investigate the implications of the currently observed accelerated expansion of the universe on its evolution within the framework of power-law-based Starobinsky-type metric f(R) gravity. Particularly, our study focuses on the evolution of the universe through key cosmological parameters, such as Hubble parameter, deceleration parameter and jerk parameter etc. Our analysis reveals that the phenomenological constant M^2 in the Starobinsky model has a very small value of 0.6538t_0^(-2), where t_0 represents the current age of the universe. Additionally, we identify that the transition from a decelerated to an accelerated phase of expansion likely occurred around 0.711t_0. This accelerated phase is predicted to persist well into the distant future, with an increasing rate of expansion as suggested by the monotonic behavior of the jerk parameter. Our results provide insights into the cosmological dynamics governed by modified gravity, indicating that the universe's accelerated expansion will continue to evolve at an accelerating rate. |