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Centro de Astrofísica da Universidade do Porto

The growth of linear perturbations in generic defect models for structure formation

P. P. Avelino, J. P. M. de Carvalho

Abstract
We study the growth of linear perturbations induced by a generic causal scaling source as a function of the cosmological parameters h, Ω0m and Ω0Λ. We show that for wavenumbers k>~0.01hMpc-1 the spectrum of density and velocity perturbations scales in a similar way to that found in inflationary models with primordial perturbations. We show that this result is independent of the more-or-less incoherent nature of the source, the small-scale power spectrum of the source and of deviations from scaling that naturally occur at late times if Ω0m≠1.

Monthly Notices of the Royal Astronomical Society
Volume 310, Page 1170
December 1999

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Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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