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astro-ph1998
Cosmic microwave background anisotropies seeded by coherent topological defects : a semi-analytic approach
Jean-Philippe Uzan, Nathalie Deruelle, Alain Riazuelo
We consider a perfectly homogeneous, isotropic and spatially flat universe which undergoes a sudden phase transition producing topological defects. We assume that these defects for…
gr-qc1998
Conservation Laws for Cosmological Perurbations
Nathalie Deruelle, Jean-Philippe Uzan
We briefly recall the problem of defining conserved quantities such as energy in general relativity, and the solution by introducing a symmetric background. We apply the general fo…