Abstract
Classically, black holes admit maximal interior volumes that grow asymptotically linearly in time. We show that such volumes remain large when Hawking evaporation is taken into account. Even if a charged black hole approaches the extremal limit during this evolution, its volume continues to grow; although an exactly extremal black hole does not have a “large interior”. We clarify this point and discuss the implications of our results to the information loss and firewall paradoxes.
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Notes
See also sec. (6.3.12) in [5] in which it was pointed out that “there is no dearth of space inside (a black hole)”.
In 4-dimensions, the black hole horizon is 2-dimensional and one can think of a flat square torus as the product of two circles, \(T^2 = S^1 \times S^1\), each of which has period \(2\pi K\).
This volume expression is, curiously, also the same as that of 5-dimensional AdS toral black holes [7].
It is worth emphasizing that the lack of maximal “large volume” in the sense of Christodoulou and Rovelli, does not imply the absence of any volume behind the horizon. Taken at face value, the Penrose diagram for an extremal black hole clearly shows that there is still “normal” spacetime region inside (see, however, [14, 15]).
Excitations over the thermal spectrum are to be expected for many models of Hawking evaporation. However one should not expect a large deviation from a thermal spectrum, at least up to the Page time [22, 23]. For a pedagogical introduction to the Page time and quantum information theory in the context of black hole information loss, see [24].
If black hole evaporation is indeed unitary, it has been argued that the mass loss is not monotonic, due to the flux of negative energy that reached asymptotic infinity [25, 26]. However such influx of negative energy is strongly constrained by quantum energy inequalities [25] and therefore should not affect the overall evolution of black holes too much.
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Acknowledgments
The author is grateful to Ingemar Bengtsson, Brett McInnes, Michael Good, Sabine Hossenfelder, and Carmen Li for useful comments and discussions. He also thanks Baocheng Zhang for pointing out a crucial mistake in the previous version of this work.
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Ong, Y.C. The persistence of the large volumes in black holes. Gen Relativ Gravit 47, 88 (2015). https://doi.org/10.1007/s10714-015-1929-x
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DOI: https://doi.org/10.1007/s10714-015-1929-x