A collaborative study between researchers at the University of Columbia in the US and the Universidad Adolfo Ib\u00e1\u00f1ez in Chile has found that, under the right conditions, gravitational fields can break and reconnect, while releasing large amounts of energy. Interestingly, researchers made the discovery while re-examining Einstein\u2019s equations, devised more than a century ago.\u00a0<\/p>\n
Einstein\u2019s field equations are a set of 10 interrelated differential equations that the physicist used to describe gravity. According to Einstein, gravity is not just a pulling force but a curvature of space-time caused by mass and energy.\u00a0<\/p>\n
Over the past few years, physicists have been developing new formulations of these equations. While the equations remain mathematically the same, they are expressed in different variables. Luca Comisso, an associate research scientist at the Department of Astronomy and Physics at Columbia University, studies plasma and found that Einstein\u2019s rewritten equation resembles one that could describe plasma.\u00a0<\/p>\n
Gravitational field connections<\/p>\n
Cossimo\u2019s previous work also involved Felipe A. Asenjo at the Universidad Adolfo Ib\u00e1\u00f1ez and, for the first time, identified a set of rules that explained limits on how space-time could bend, stretch, and evolve.\u00a0<\/p>\n
In their recent work, the researchers show how gravitational field connections can change when ideal conditions to break them down exist. These are called gravitational reconnection.\u00a0<\/p>\n
\u201cEinstein\u2019s equations<\/a> contain constraints on how space-time can evolve that are not immediately apparent,\u201d said Asenjo in a press release. \u201cBy revealing these hidden new properties, we can begin to understand the fundamental rules governing how this gravitational reconnection process behaves.\u201d<\/p>\n Works like magnetism<\/p>\n To simplify how gravitational reconnection works, the researchers took help from a similar phenomenon seen in magnetism called magnetic reconnection. \u201cMagnetic reconnection is when these field lines, in some specific configuration, break and reattach in a different configuration,\u201d Comisso said. \u201cWhen they break and reconnect, they release energy.\u201d<\/p>\n In their study, the researchers argue that gravity can do the same. However, the geometry is different because Einstein\u2019s space-time has four dimensions, instead of three. To make sense of this, the researchers suggest that gravity be considered as field sheets, instead of field lines.\u00a0<\/p>\n \u201cAdding one dimension to a line gives you a plane. You can think of it as putting many lines together to form a \u2018sheet,\u201d explained Comisso.\u00a0<\/p>\n These sheets then stretch, move and reconnect, releasing energy, and although they are not physical objects, the reconnection is a mathematical process that describes how energy is transferred to matter.\u00a0<\/p>\n \u201cIt helps us predict some patterns of the space-time,\u201d added Comisso in the press release<\/a>.\u00a0 \u201cEven without doing the full calculation, we know that space-time needs to behave in a certain way, that it needs to satisfy those constraints.\u201d<\/p>\n