Discussion Overview
The discussion revolves around the formation of black holes (BH) from a classical perspective, excluding quantum effects. Participants inquire about dynamic models of BH formation, characteristic times for the appearance of a finite Schwarzschild radius, and growth rates based on initial mass density.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant seeks an introduction to classical models of black hole formation and questions the sense of their inquiries regarding dynamic models, characteristic times, and growth rates.
- Another participant references the Oppenheimer-Snyder model for non-rotating, spherically symmetric black hole collapse, noting that this model may not accurately represent real black hole formation due to rotation and lack of perfect symmetry.
- The Oppenheimer-Snyder model's interior solution resembles Friedmann-Robertson-Walker cosmology, while the exterior solution is Schwarzschild, with a finite proper time to reach the singularity.
- Realistic black hole collapse is described as more complex and still under investigation, with a suggestion to search for "Poisson-Israel" for further discussion.
- Participants share links to resources, including animations and articles, that illustrate stellar evolution and black hole formation, with varying degrees of mathematical detail.
Areas of Agreement / Disagreement
Participants express differing views on the applicability of classical models to real black hole formation, indicating that multiple competing perspectives exist regarding the complexity and realism of these models.
Contextual Notes
The discussion highlights limitations in the classical models, such as assumptions of symmetry and rotation, and acknowledges that the mathematical details of realistic collapse scenarios remain unresolved.