Abstract
We study the condition that the theory is unitary and stable in three-dimensional gravity with the most general quadratic curvature, Lorentz–Chern–Simons and cosmological terms. We provide the complete classification of the unitary theories around flat Minkowski and (anti-)de Sitter spacetimes. The analysis is performed by examining the quadratic fluctuations around these classical vacua. We also discuss how to understand the critical condition for four-dimensional theories at the Lagrangian level.
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