Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-04-28
Phys.Rev. D70 (2004) 024001
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
15 pages, Latex File, accepted for publication in Physical Review D
Scientific paper
10.1103/PhysRevD.70.024001
Recently we studied the effects of information carrying waves propagating through isotropic cosmologies. By information carrying we mean that the waves have an arbitrary dependence on a function. We found that the waves introduce shear and anisotropic stress into the universe. We then constructed explicit examples of pure gravity wave perturbations for which the presence of this anisotropic stress is essential and the null hypersurfaces playing the role of the histories of the wave-fronts in the background space-time are shear-free. Motivated by this result we now prove that these two properties are true for all information carrying waves in isotropic cosmologies.
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