Fluid-flow description of density irregularities in the Universe

Details Fluid-flow description of density irregularities in the Universe Fluid-flow description of density irregularities in the Universe

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvd..38..485l&link_type=abstract

Physical Review D (Particles and Fields), Volume 38, Issue 2, 15 July 1988, pp.485-489

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46

Fundamental Problems And General Formalism

Scientific paper

A new derivation is given of two differential equations for the energy-density irregularities in the Universe, defined on a comoving hypersurface. One of them, a second-order equation, is valid generally and the other, a first-order equation, is valid when ∇2P is negligible where P is the pressure. The new derivation of these important equations uses the fluid-flow equations as advocated by Hawking in 1966, and is much simpler than the usual one involving metric perturbations. The regime of validity of the first-order equation is discussed in some detail.

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