Einstein's equations reveal how gravity could break, reconnect, and release energy

Physicists Luca Comisso of Columbia University and Felipe A. Asenjo of Universidad Adolfo Ibáñez in Chile have found that Einstein's equations of general relativity permit gravitational fields to break and reconnect in a process they term gravitational reconnection, according to calculations published in Physical Review D. The researchers reexamined Einstein's equations using a mathematical formulation that reveals similarities between gravity and electromagnetism, discovering that under certain conditions gravitational field connections can break down and reconnect in new configurations, allowing energy to flow from the gravitational field into matter.

Comisso stressed this is not new physics. "We are not modifying general relativity or introducing new physics beyond it," he said. "Rather, we are identifying physical principles that have remained unrecognized for more than a century." The work builds on an earlier paper with Maricarmen A. Winkler of Adolfo Ibáñez University showing gravitational fields can behave as though their connections are frozen in place, preserving links between regions as spacetime evolves — mirroring magnetic fields in plasma where field lines stay connected even as plasma flows.

Because gravity operates in four-dimensional spacetime, the researchers describe it with field "sheets" rather than lines. "Adding one dimension to a line gives you a plane," Comisso explained. These sheets are a mathematical picture, not physical surfaces that literally tear; their reconnection describes a way for the gravitational field to hand energy to matter. The team realized the close analogy to magnetic reconnection only after working through calculations "step by step at the blackboard."

Researchers believe the connection could give new insight into gravity under extreme conditions, including black hole collisions where spacetime undergoes severe distortions that make even powerful computer simulations hard to interpret. The approach could help identify fundamental rules governing gravitational fields in those regions. The next step involves seeking observational evidence in astrophysical phenomena and gravitational wave signals from observatories like LIGO, which has already detected waves from black hole mergers. For now, gravitational reconnection remains a theoretical result whose operation under astrophysical conditions and observability still need to be established.