Professor Pedro Ferreira: Publications

Doppler peaks from active perturbations

PHYSICAL REVIEW LETTERS 76:15 (1996) 2617-2620

Authors:

J Magueijo, A Albrecht, D Coulson, P Ferreira

How anisotropic is our Universe?

PHYSICAL REVIEW LETTERS 77:14 (1996) 2883-2886

Authors:

EF Bunn, PG Ferreira, J Silk

Structure of Doppler peaks induced by active perturbations

PHYSICAL REVIEW D 54:6 (1996) 3727-3744

Authors:

J Magueijo, A Albrecht, P Ferreira, D Coulson

Doppler peaks from active perturbations

(1995)

Authors:

Joao Magueijo, Andreas Albrecht, David Coulson, Pedro Ferreira

Doppler peaks from active perturbations

ArXiv astro-ph/9511042 (1995)

Authors:

Joao Magueijo, Andreas Albrecht, David Coulson, Pedro Ferreira

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.

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