Abstract
We study the backreaction of a thermal field ina weak gravitational background depicting the far-fieldlimit of a black hole enclosed in a box by the closedtime path (CTP) effective action and the influence functional method. We derive the noise anddissipation kernels of this system in terms ofquantities in quasiequilibrium, and formally prove theexistence of a fluctuation-dissipation relation (FDR) at all temperatures between the quantumfluctuations of the thermal radiance and the dissipationof the gravitational field. This dynamical self-consistent interplay between the quantum field and theclassical spacetime is, we believe, the correct way totreat backreaction problems. To emphasize this point wederive an Einstein–Langevin equation whichdescribes the nonequilibrium dynamics of thegravitational perturbations under the influence of thethermal field. We show the connection between our methodand the linear response theory (LRT), and indicate howthe functional method can provide more accurate results than prior derivations of FDRs via LRT in thetest-field, static conditions. This method is inprinciple useful for treating fully nonequilibrium casessuch as backreaction in black hole collapse.
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Campos, A., Hu, B.L. Fluctuations in a Thermal Field and Dissipation of a Black Hole Spacetime: Far-Field Limit. International Journal of Theoretical Physics 38, 1253–1271 (1999). https://doi.org/10.1023/A:1026670816596
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DOI: https://doi.org/10.1023/A:1026670816596