Compact Star in F(R) Gravity: Degeneracy Problem and Non-Integer Power Correction
报告人（单位）
Dr. Taishi Katsuragawa
报告时间
2022年6月22日（周三）9:00
直播二维码
报告人介绍
Dr. Taishi Katsuragawa received his Ph.D. from Nagoya University in 2017. After working in postdoctoral research positions at Kobayashi-Maskawa Institute and Central China Normal University, he joined in Institute of Astrophysics of Central China Normal University as an associate professor. His research interests are the modified gravity theory and its applications to particle cosmology and astrophysics.
报告摘要
The F(R) gravity is one of the extensions of general relativity, and it has been investigated in various research fields. This talk focuses on the astrophysical application and demonstrates that adjusting the F(R) function can construct an arbitrary mass-radius relation of the compact star because the model-dependence of the equation of state and modification of gravity degenerate to each other. We also see that a non-integer curvature power correction is naturally introduced when the Schwarzschild spacetime is chosen as a boundary condition, which gives guidelines for model-building in F(R) gravity. Comparing with the reconstruction method known in cosmology and higher-curvature corrections to avoid curvature singularities in the dark energy model, we consider some problems in the existing studies on compact stars and discuss the prospects for future studies.