Novel characterization of gravitational radiation in asymptotically flat spacetimes
Francisco Fernández-Álvarez, José M. M. Senovilla
Abstract
A novel criterion to determine the presence of gravitational radiation arriving to, or departing from, null infinity of any weakly asymptotically simple spacetime with vanishing cosmological constant is given. The quantities involved are geometric, of tidal nature, with good gauge behavior and univocally defined at null infinity. The relationship with the classical characterization using the news tensor is analyzed in detail. A new balance law at infinity is presented, which may be useful to define ``radiation states.''
Topics & Concepts
InfinityNull (SQL)PhysicsSpacetimeGravitationGravitational waveMathematical physicsCharacterization (materials science)Gauge (firearms)Simple (philosophy)Theoretical physicsRadiationTensor (intrinsic definition)Classical mechanicsPure mathematicsMathematical analysisMathematicsAstrophysicsQuantum mechanicsOpticsComputer scienceHistoryDatabaseArchaeologyEpistemologyPhilosophyBlack Holes and Theoretical PhysicsCosmology and Gravitation TheoriesPulsars and Gravitational Waves Research