Derives conditions under which energy remains positive for individual plane waves in six- and eight-derivative polynomial gravity, focusing on tensor and scalar sectors of the free theory.
Veltman, Unitarity and causality in a renormalizable field theory with unstable parti- cles, Physica 29 (1963) 186
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Conditions for positivity of energy in superrenormalizable polynomial gravity
Derives conditions under which energy remains positive for individual plane waves in six- and eight-derivative polynomial gravity, focusing on tensor and scalar sectors of the free theory.