TITLE:
Bach-Einstein Gravitational Field Equations as a Perturbation of Einstein Gravitational Field Equations
AUTHORS:
Fathy Ibrahim Abdel-Bassier, Ahmed Fouad Abdel-Wahab, Fayrouz Mostafa Abdel-Maboud
KEYWORDS:
Gravitational Theory, Higher Order Gravity, Buchdahl’s Formula, Bach-Einstein Gravitational Field Equations, Raychaudhuri Equation, Tolman’s Formula
JOURNAL NAME:
Applied Mathematics,
Vol.13 No.12,
December
30,
2022
ABSTRACT: The Bach equations are a version of higher-order gravitational field equations, exactly they are of fourth-order. In 4-dimensions the Bach-Einstein gravitational field equations are treated here as a perturbation of Einstein’s gravity. An approximate inversion formula is derived which admits a comparison of the two field theories. An application to these theories is given where the gravitational Lagrangian is expressed linearly in terms of R, R2, |Ric|2, where the Ricci tensor Ric = Rαβdxαdxβ is inserted in some formulas which are of geometrical or physical importance, such as; Raychaudhuri equation and Tolman’s formula.