Causality and the Doppler Peaks

Details Causality and the Doppler Peaks Causality and the Doppler Peaks

1996-04-29

arxiv.org/abs/astro-ph/9604172v2

Phys.Rev.D54:3686-3689,1996

Astronomy and Astrophysics

Astrophysics

4 pages, RevTex file and three figures, This version is to appear in Phys Rev D, Rapid Communications. It includes minor typo

Scientific paper

10.1103/PhysRevD.54.R3686

Could cosmic structure have formed by the action of causal physics within the standard hot big bang, or was a prior period of inflation required? Recently there has been some discussion of whether causal sources could reproduce the pattern of Doppler peaks of the standard scale-invariant adiabatic theory. This paper gives a rigorous definition of causality, and a causal decomposition of a general source. I present an example of a simple causal source which mimics the standard adiabatic theory, accurately reproducing the behaviour of the local intrinsic temperature perturbations.

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