Spin-1 gravitational waves
F. Canfora, G. Vilasi, P. Vitale

TL;DR
This paper investigates a specific class of gravitational fields with symmetries, analyzing their potential to represent gravitational waves, defining their energy and polarization, and describing realistic sources that generate such waves.
Contribution
It introduces a new class of spin-1 gravitational wave solutions with detailed analysis of their properties and sources, expanding the understanding of gravitational wave phenomena.
Findings
Identified conditions under which these fields represent gravitational waves
Defined energy and polarization characteristics of the waves
Described realistic sources capable of generating these gravitational waves
Abstract
Gravitational fields invariant for a 2-dimensional Lie algebra of Killing fields [ X,Y] =Y, with Y of light type, are analyzed. The conditions for them to represent gravitational waves are verified and the definition of energy and polarization is addressed; realistic generating sources are described.
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