Nonlinear Dynamics of Parity-Even Tricritical Gravity in Three and Four Dimensions

Understand

Recently proposed "multicritical" higher-derivative gravities in Anti de Sitter space carry logarithmic representations of the Anti de Sitter isometry group.

• While generically non-unitary already at the quadratic, free-theory level, in special cases these theories admit a unitary subspace.
• The simplest example of such behavior is "tricritical" gravity.
• In this paper, we extend the study of parity-even tricritical gravity in d = 3, 4 to the first nonlinear order.