Curvature expansion of the heat kernel and effective action is derived for quasi-thermal non-vacuum gravitational backgrounds using a covariant generalized Killing vector field.
Though the latter is locally flat, the non-trivial effects arise due to the periodicity over the coordinateš„0 ā[0, š½) parameterizingš 1 component
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Non-vacuum gravitational effective action
Curvature expansion of the heat kernel and effective action is derived for quasi-thermal non-vacuum gravitational backgrounds using a covariant generalized Killing vector field.