Penrose Diagram for a Transient Black Hole

Understand

A Penrose diagram is constructed for a spatially coherent black hole that smoothly begins an accretion, then excretes symmetrically as measured by a distant observer, with the initial and final states described by a metric of Minkowski form.

• Coordinate curves on the diagram are computationally derived.
• Causal relationships between space-time regions are briefly discussed.
• The life cycle of the black hole demonstrably leaves asymptotic observers in an unaltered Minkowski space-time of uniform conformal scale.