Preliminary study on the impact of stress-energy tensor compared to scalar field in Nonminimal Derivative model

Abstract

In this article, we report the results of comparing the effect of using trace of stress-energy tensor versus real-valued scalar field in Nonminimal Derivative Coupling gravitation model, respectively denoted as NMDC-T and NMDC-phi. We employ the model into an incompressible star and see the effect of both models NMDC-T and NMDC-phi on the compactness and mass-radius relation. We find that coupling parameters of NMDC-T is less sensitive than NMDC-phi.

13 pages, 5 figures. This is a preprint, prior to copyediting, of an article accepted in Modern Physics Letters A, copyright World Scientific Publishing Company, on March 31, 2026. This is a part of papers related to IP's presentation in Southeast Asian Workshop on Nuclear and Hadron Physics (SEA-NHP), UGM, Indonesia https://indico.global/event/13949/page/4743-proceeding