Acoustics of early universe. II. Lifshitz vs. gauge-invariant theories

Details Acoustics of early universe. II. Lifshitz vs. gauge-invariant theories Acoustics of early universe. II. Lifshitz vs. gauge-invariant theories

2000-02-15

arxiv.org/abs/gr-qc/0002051v2

J.Math.Phys. 42 (2001) 856-862

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Scientific paper

10.1063/1.1335557

Appealing to classical methods of order reduction, we reduce the Lifshitz
system to a second order differential equation. We demonstrate its equivalence
to well known gauge-invariant results. For a radiation dominated universe we
express the metric and density corrections in their exact forms and discuss
their acoustic character.

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