We show that the stress tensor of a real scalar quantum field on Reissner-Nordström-de Sitter spacetime exhibits correlations over macroscopic distances near the Cauchy horizon. These diverge as the Cauchy horizon is approached and are universal, i.e., state independent. This signals a breakdown of the semiclassical approximation near the Cauchy horizon. We also investigate the effect of turning on a charge of the scalar field and consider the correlation of the stress tensor between the two poles of the Cauchy horizon of Kerr-de Sitter spacetime.

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• Quantum aspects of black holes
• Quantum fields in curved spacetime