Researchers have identified a theoretical possibility for black holes to split into two smaller black holes under specific conditions. This study, published in the journal Physical Review D, suggests that a rapidly spinning black hole could potentially defy traditional physics, which typically prevents such fragmentation.
The team, led by Francesco Sannino, a co-author and physics professor at the University of Naples Federico II and the University of Southern Denmark, investigated the laws that typically keep black holes stable. They aimed to determine whether certain conditions could allow black holes to bypass these laws.
Understanding Black Hole Stability
Black holes are known to merge into larger entities; however, the concept of entropy presents a significant challenge to the idea of splitting. Entropy, in simple terms, refers to the number of potential microscopic states in a system. A non-rotating black hole that splits would face a thermodynamic disadvantage, as this process would lower the total entropy, making it unfavorable.
As a result, physics generally prefers that black holes merge rather than fragment. However, the researchers found that for rotating black holes, this rule might not be as absolute.
Pioneering a New Understanding
According to the researchers’ findings, a black hole rotating at an exceptionally high speed may find a loophole in the thermodynamic constraints that usually prevent splitting. However, simply producing two smaller black holes is not sufficient; they must also separate sufficiently to avoid merging back together.
Sannino noted that once the requirement for this separation is taken into account, the conditions for a successful split become extremely limited, particularly for black holes nearing their maximum rotational velocity.
Exploring Theoretical Dimensions
The study also explored the implications of theories that posit additional dimensions beyond our traditional three-dimensional space. Some models suggest that black-hole-like objects within these extra dimensions could become unstable and fragment under certain conditions. In these scenarios, splitting could even be thermodynamically favorable, especially if one black hole is significantly smaller than the other.
Despite these theoretical conclusions, the researchers emphasize that they have not yet established concrete conditions under which fragmentation would occur.
Future Research Directions
The likelihood of black holes splitting remains undetermined, as it depends on the behavior of gravity outside the confines of Einstein’s general relativity. The researchers speculate that primordial black holes, potentially formed in the early universe, might be more susceptible to splitting compared to larger black holes observed today.
Additionally, the team suggests that indirect evidence of black hole fragmentation could be pursued through gamma-ray observatories like NASA’s Fermi Large Area Telescope. Such instruments might be able to detect signals from small black hole remnants resulting from mergers.
This study presents a theoretical exploration rather than an empirical discovery. As of now, no black hole has been confirmed to split, challenging the conventional view of these cosmic entities as only capable of growth through the accretion of matter or merging with other black holes.
