Abstract Details
| Name: Debojit Paul Affiliation: Gauhati University Conference ID: ASI2025_146 Title : Probing Modified Gravity through Orbital Dynamics: From the Galactic Center Black Hole to the Solar System Authors and Co-Authors : Debojit Paul 1, Sanjeev Kalita 1 Abstract Type : Poster Abstract Category : High Energy Phenomena, Fundamental Physics and Astronomy Abstract : Orbits serve as a natural probe for testing gravitational theories across various scales. By studying orbits, predictions of different gravitational models can be tested under various conditions of the gravitational potential. In this work, we study the stellar orbits near the Galactic Center (GC) black hole as well as the planetary orbits in the solar system in a modified theory of gravity. We develop a rotating axially symmetric metric within the framework of f(R)-scalaron gravity. The metric is subjected to astronomical tests near the GC black hole through stellar orbits. The predictions of the metric are found to be consistent with very high spin value of GC black hole and is complemented by recent observations. In the solar system, the theory is further tested using observational data for six planets(upto saturn) as well as Trans Neptunian objects(TNOs), Centaurs and Scattered Disk Objects(SDOs) orbital data. The theory is found to be consistent in the inner solar system but is found to deviate from general relativity towards the outer solar system. The cosmological implications of the theory are also highlighted. References: 1. Paul D., Bhattacharjee P., Kalita S., 2024, ApJ, 964, 127 2. Paul D., Kalita S., 2024, arXiv:2406.00351 3. GRAVITY Collaboration et al. 2020, A&A, 636, L5 4. Kalita, S. 2018, ApJ, 855, 70 |