Causal perturbation theory in general FRW cosmologies I: energy momentum conservation and matching conditions

Abstract

We describe energy--momentum conservation in relativistic perturbation theory in general FRW backgrounds with causal source terms, such as the presence of cosmic defect networks. We provide a prescription for a linear energy--momentum pseudo-tensor in a curved FRW universe, decomposing it using eigenfunctions of the Helmholtz equation. We also construct conserved vector densities for the conformal geometry of these spacetimes and relate these to our pseudo-tensor, demonstrating the equivalence of these two approaches. We also relate these techniques to the role played by residual gauge freedom in establishing matching conditions at early phase transitions, which we can express in terms of components of our pseudo-tensor. This formalism is concise and geometrically sound on both sub- and superhorizon scales, thus extending existing work to a physically (and numerically) useful context.

28 pages. To be submitted to Physical Review D

References in corpus (4)

• Inflation and the dS/CFT Correspondence
• Cosmic Structure Formation with Topological Defects
• Relativistic conservation laws and integral constraints for large cosmological perturbations
• Constraining Isocurvature Perturbations with CMB Polarization

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• Fluctuations in the CMB Induced by Cosmic Strings: Methods and Formalism
• Cosmological perturbation theory, instantaneous gauges and local inertial frames
• Covariant conserved currents for scalar-tensor Horndeski theory
• Affine Gravity, Palatini Formalism and Charges