An almost-Robertson-Walker universe model and the equivalence classes of perturbations: Nonbarotropic perfect fluids (Q2785698)
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scientific article; zbMATH DE number 981839
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | An almost-Robertson-Walker universe model and the equivalence classes of perturbations: Nonbarotropic perfect fluids |
scientific article; zbMATH DE number 981839 |
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10 July 1997
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Robertson-Walker universe
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perturbations
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An almost-Robertson-Walker universe model and the equivalence classes of perturbations: Nonbarotropic perfect fluids (English)
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An almost-Robertson-Walker universe dominated by a general perfect fluid with two essential thermodynamic variables is investigated. New covariant and gauge-invariant treatments of perturbations are used. The paper proposes to define gauge-invariant perturbations as equivalence classes of tangents to one-parameter families of exact solutions of the nonlinear field equations.
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