Authors derive the second term in the wave-trace expansion on stationary spacetimes as an analogue of the second heat kernel coefficient, reducing to the scalar curvature term for ultrastatic metrics.
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Heat and Wave kernel expansions for stationary spacetimes
Authors derive the second term in the wave-trace expansion on stationary spacetimes as an analogue of the second heat kernel coefficient, reducing to the scalar curvature term for ultrastatic metrics.