What is it about?
This paper studies how a certain family of self-gravitating compact objects interacts with scalar waves. Specifically, we analyse the absorption spectrum. The objects studied are called black hole remnants because for large values of the mass they develop an event horizon while for lower values of the mass they lose it leaving a regular wormhole as remnant. This transformation happens in a continuous manner and requires to maintain the charge-to-mass ratio fixed to a specific value.
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Why is it important?
The results presented here are relevant because the absorption spectrum of these objects is different from the spectrum of other compact objects (like black holes or objects with a clean photonsphere), which allows to tell them appart. In particular, we find that the spectrum is characterized by Breit-Wigner-like resonances, whose frequencies are related to the distance between the wormhole throat and its photonsphere.
Perspectives
We now want to investigate if the absorption spectrum of other solutions of this type but which possess curvature divergences at the wormhole throat is also well defined. Since such solutions are geodesically complete, despite having curvature divergences, the high-frequency behavior should agree with the classical absorption cross section in the geometrical optics approximation. Exploring the low frequency limit could provide new ways to learn about the interaction between matter waves and regions of extreme curvature.
Gonzalo J Olmo
Universitat de Valencia
Read the Original
This page is a summary of: Absorption by black hole remnants in metric-affine gravity, July 2019, American Physical Society (APS),
DOI: 10.1103/physrevd.100.024016.
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