2019/12/24 by Kim Jik-su, Jik-su, Kim, Kim Chol-jun +1
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.1912.11227
openalex publication_date 2019/12/24 · openalex created_date 2020/01/10 · openalex updated_date 2026/07/28
A role of the scalar-matter direct coupling in the evolution of scalar-tensor gravity was studied. If the coupling functions in the generalized scalar-tensor gravity satisfy a definite equation the scalar-tensor gravity is reduced to Einstein's tensor gravity. We consider the issue in Jordan frame and then Einstein frame. It is shown that the coupling strength in the right hand side of the master equation obtained in Damour and Nordtvedt(1993) must be added by a coupling strength β which characterizes the scalar-matter direct coupling. If a minimum of potential ln C(φ) does not coincide with one of the potential ln A(φ) or the potential ln C(φ) does not have any minimum and is a monotonic function, then the attractor mechanism of scalar-tensor gravity toward pure general relativity should be modified, and the combined potential ln A(φ)+ln C(φ) will determine the attractor mechanism.