Quantum gravity alone is not the only major theoretical open problem in fundamental physics: gravity, quantum theory and thermodynamics form a triple, whose full interconnections we have definitely not yet understood. As soon as quantum effects appear in a curved spacetime, thermal aspects appear to be unavoidable. Combining thermodynamics and (full) gravity might turn out to be even more crucial than understanding the quantum aspects of the gravitational field alone. In recent years, it has become increasingly clear that entanglement entropy is a central ingredient for the synthesis we are seeking.
Recent years have seen a flourishing of interest in the role that entanglement entropy plays in the physics of spacetime. Insights have been obtained into the role of entanglement for the entropy for black hole thermodynamics, and new ideas have been explored connecting entanglement to holography, wormholes, to the structure itself of semiclassical spacetime and others. This special issue collects a number of articles on this topic, offering a partial overview of these new developments.
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