{'fraction_non_alphanumeric': 0.03076923076923077, 'fraction_numerical': 0.015384615384615385, 'mean_word_length': 4.745098039215686, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Structure of the black hole nucleus

Explores different possibilities for the nuclear structure of a black hole formed by a collapse with zero angular momentum. If the stress induced by vacuum polarisation along the axes of the 3-cylinders r=constant is a tension rather than a pressure, the spacetime geometry could be self-regulatory and describable semiclassically down to radii of a few Planck units. The nucleus would then appear as an open string of roughly constant sub-Planckian density, with a thickness of order (h(cross)G2M/c5)13/-about 10-20 cm for a solar-mass black hole.