Causality and the Doppler Peaks
Abstract
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 strictly causal source which accurately mimics the standard theory, and give a general discussion of the causality limit.Keywords
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