Abstract
To understand the true nature of black holes, fundamental theoretical developments should be linked all the way to observational features of black holes in their natural astrophysical environments. Here, we take several steps to establish such a link. We construct a family of spinning, regular black-hole spacetimes based on a locality principle for new physics and analyze their shadow images. We identify characteristic image features associated to regularity (increased compactness and relative stretching) and to the locality principle (cusps and asymmetry) that persist in the presence of a simple analytical disk model. We conjecture that these occur as universal features of distinct classes of regular black holes based on different sets of construction principles for the corresponding spacetimes.
Highlights
Two main disadvantages: First, it is impossible to cover every conceivable theory beyond General Relativity (GR)
We identify characteristic image features associated to regularity and to the locality principle that persist in the presence of a simple analytical disk model
We develop a parameterized family of black-hole metrics that is based on a set of physical principles
Summary
Two main disadvantages: First, it is impossible to cover every conceivable theory beyond GR. We construct a family of spinning, regular black-hole spacetimes based on a locality principle for new physics and analyze their shadow images. We conjecture that these occur as universal features of distinct classes of regular black holes based on different sets of construction principles for the corresponding spacetimes.
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