Notes on Born-Infeld-like modified gravity

作者：Kruglov S I^*

来源：Astrophysics and Space Science, 2016, 361(2): 73.

DOI：10.1007/s10509-016-2665-8

• modified gravity
• Einstein-Hilbert action
• Local tests
• Jordan and Einstein frames
• Scalar field
• De Sitter space
• Ricci scalar
• Critical points
• Autonomous equations

We investigate the modified F(R) gravity theory with the function F(R) = (1 - root 1 - 2 lambda R - sigma(lambda R)(2))/lambda. The action is converted into Einstein-Hilbert action at small values of lambda and sigma. The local tests give a bound on the parameters, lambda(1 + sigma) <= 2 x 10(-6) cm(2). The Jordan and Einstein frames are considered, the potential, and the mass of the scalar field were obtained. The constant curvature solutions of the model are found. It was demonstrated that the de Sitter space is unstable but a solution with zero Ricci scalar is stable. The cosmological parameters of the model are evaluated. Critical points of autonomous equations are obtained and described.

• 出版日期2016-2