Doppler Peaks from Active Perturbations

1995/11/14 by João Magueijo, Joao Magueijo, Andreas Albrecht +3 · 86 citations
Physics and Astronomy · #Advanced Differential Geometry Research #Anisotropy #Astrophysics #COSMIC cancer database #Computational physics #Computer science #Cosmic microwave background #Cosmology and Gravitation Theories #Doppler effect #Formalism (music) #Physics #Quantum mechanics #Radio Astronomy Observations and Technology #Spectral density #astro-ph

paper · pdf · doi:10.1103/physrevlett.76.2617

published in Physical Review Letters 76(15), 2617-2620 (American Physical Society) · uufile, 8pages, 3 figures. Now available at http://euclid.tp.ph/Papers/index.html; Changes: URL added, Eqn. (8) expanded, grant numbers included

arxiv created 1995/11/14 · openalex publication_date 1996/04/08 · arxiv updated 2010/04/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We examine how the qualitative structure of the Doppler peaks in the angular power spectrum of the cosmic microwave anisotropy depends on the fundamental nature of the perturbations which produced them. The formalism of Hu and Sugiyama is extended to treat models with cosmic defects. We discuss how perturbations can be ``active'' or ``passive'' and ``incoherent'' or ``coherent,'' and show how causality and scale invariance play rather different roles in these various cases. We find that the existence of secondary Doppler peaks and the rough placing of the primary peak unambiguously reflect these basic properties.

Citations

• Causality, Randomness, and the Microwave Background

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