Gravitational instabilities in helicity-1 waves propagating through matter in equilibrium

Details Gravitational instabilities in helicity-1 waves propagating through matter in equilibrium Gravitational instabilities in helicity-1 waves propagating through matter in equilibrium

2000-08-14

arxiv.org/abs/gr-qc/0008028v2

Class.Quant.Grav.17:L117-L124,2000

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, latex, 1 figure ps file, final version to appear in CQG

Scientific paper

10.1088/0264-9381/17/18/102

It is shown that the interaction of helicity-1 waves of gravity and matter in a thin slab configuration produces new types of instabilities. Indeed, a transverse spin-2 helicity-1 mode interacts strongly with the shear motion of matter. This mode is unstable above a critical wavelength which reminds the Jeans wavelength but with the speed of sound interchanged by the speed of light. The two instabilities are of course different. For the case analyzed, a plane parallel configuration, Jeans instability appears through a density wave perturbation, the material collapsing into a set of plane-parallel slabs. On the other hand, the helicity-1 wave instability induces a transverse motion in the fluid that tends to shear in the material along the node of the perturbation.

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