3 years ago

Causality and $a$-theorem constraints on Ricci polynomial and Riemann cubic gravities

Causality and $a$-theorem constraints on Ricci polynomial and Riemann cubic gravities
H. Lü, Jun-Bao Wu, Yue-Zhou Li
In this paper, we study Einstein gravity extended with Ricci polynomials and derive the constraints on the coupling constants from the considerations of being ghost-free, exhibiting an $a$-theorem and maintaining causality. The salient feature is that Einstein metrics with appropriate effective cosm...

Publisher URL: http://link.aps.org/doi/10.1103/PhysRevD.97.024023

DOI: 10.1103/PhysRevD.97.024023

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