Relativistic conservation laws and integral constraints for large cosmological perturbations

Details Relativistic conservation laws and integral constraints for large cosmological perturbations Relativistic conservation laws and integral constraints for large cosmological perturbations

2005-04-09

arxiv.org/abs/gr-qc/0504041v1

Phys.Rev. D55 (1997) 5957-5969

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

This paper, published 7 years ago, was found useful by some researchers but originally was not put on the gr-qc website. Now i

Scientific paper

10.1103/PhysRevD.55.5957

For every mapping of a perturbed spacetime onto a background and with any vector field $\xi$ we construct a conserved covariant vector density $I(\xi)$, which is the divergence of a covariant antisymmetric tensor density, a "superpotential". $ I(\xi)$ is linear in the energy-momentum tensor perturbations of matter, which may be large; $I(\xi)$ does not contain the second order derivatives of the perturbed metric. The superpotential is identically zero when perturbations are absent. By integrating conserved vectors over a part $\Si$ of a hypersurface $S$ of the background, which spans a two-surface $\di\Si$, we obtain integral relations between, on the one hand, initial data of the perturbed metric components and the energy-momentum perturbations on $\Si$ and, on the other hand, the boundary values on $\di\Si$. We show that there are as many such integral relations as there are different mappings, $\xi$'s, $\Si$'s and $\di\Si$'s. For given boundary values on $\di\Si$, the integral relations may be interpreted as integral constraints (e.g., those of Traschen) on local initial data including the energy-momentum perturbations. Conservation laws expressed in terms of Killing fields $\Bar\xi$ of the background become "physical" conservation laws. In cosmology, to each mapping of the time axis of a Robertson-Walker space on a de Sitter space with the same spatial topology there correspond ten conservation laws. The conformal mapping leads to a straightforward generalization of conservation laws in flat spacetimes. Other mappings are also considered. ...

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