Einstein's equations suggest gravity could break, reconnect and release energy
Physicists examining Einstein's theory of gravity have found a theoretical possibility that gravitational fields can reconnect and pass energy to matter. The process resembles the magnetic reconnection behind solar flares.
Physicists who re-examined the equations of Albert Einstein's theory of gravity from a different mathematical angle have found a theoretical possibility: the underlying structures of gravitational fields may break and reconnect, moving energy from gravity into matter. They call the phenomenon "gravitational reconnection." It resembles a process behind some of the Sun's most powerful eruptions, and could shed light on gravity under extreme conditions, including collisions between black holes.
The work was done by Luca Comisso, an associate research scientist in the Departments of Astronomy and Physics and the Astrophysics Laboratory at Columbia University in the US, and Felipe A. Asenjo of Universidad Adolfo Ibáñez in Chile. They noticed a similarity between gravity and plasmas, which are electrically charged gases.
The solar flare analogy
In a plasma, magnetic field lines can be pulled, twisted and stretched. Under certain conditions they suddenly change their connections and release stored energy, a process known as magnetic reconnection. Comisso explains that energy moves from the magnetic field to the plasma particles, producing explosions and energetic events.
Gravity operates in four-dimensional space-time, so its mathematical description involves field "sheets" rather than lines. The researchers stress that these sheets are mathematical representations, not physical surfaces that literally tear.
Hidden rules
The study, "Reconnection of Gravitational Fields," appeared in Physical Review D. It builds on an earlier paper in Physical Review Letters by Comisso, Asenjo and Maricarmen A. Winkler, which identified constraints on which changes in space-time geometry are possible. In the new work, the authors investigated what happens when the ideal conditions that normally preserve connections no longer hold.
The approach relies on a formulation of Einstein's equations developed in recent years. It is mathematically equivalent to the original but resembles the equations used in plasma physics.
Implications for black holes
Merging black holes are typically studied with supercomputer simulations that help predict gravitational waves, which instruments such as LIGO (the Laser Interferometer Gravitational-Wave Observatory) can detect. The newly identified rules could complement those simulations.
For now the finding is purely theoretical. Scientists have not established how the process works in real astrophysical settings or whether its effects can be observed. The next step is to study it in specific situations, especially black hole mergers. Comisso hopes it will become possible to estimate how much energy is released and whether reconnection leaves recognizable signatures in gravitational wave signals. The research was supported by the National Science Foundation and NASA.
