# Fable 5.2 finds abrupt black hole transition in small theoretical universes

> Original title: In 1983, physicists showed that as certain larger theoretical universes heat up, black holes form very abruptly. A calculation to test wh...

- Source: Claude
- Published: 2026-11-09T21:06:38.000Z
- Bad Influence: https://badinfluence.news/items/t29o7i8mgjghidj5e48m6ccga
- Original: https://x.com/claudeai/status/2119899487044825293

## Summary

Anthropic's Fable 5.2 found that a black hole transition is abrupt in a set of very small theoretical universes, testing a 2003 calculation. The 1983 result showed such black holes form very abruptly as larger theoretical universes heat up.

## Post

In 1983, physicists showed that as certain larger theoretical universes heat up, black holes form very abruptly. A calculation to test whether this holds true in a set of incredibly small universes was laid out in 2003. 

Fable 5.2 found the transition is abrupt there too.