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hep-ph2025
Cosmology of Gravi-Axions
Stephon Alexander, Gregory Gabadadze, Leah Jenks +1
We show how a mass term for gravitational axions (''gravi-axions'') with a Chern-Simons coupling to gravity can naturally arise due to non-perturbative contributions from Euclidean…
hep-th2025
Weakly-Coupled Trace Anomaly Action for Gravity
Gregory Gabadadze, Giorgi Tukhashvili
We discuss a local, diff-invariant quantum effective action for gravity that captures the trace anomaly via a counter-term. We discuss why this counter-term is the most significant…