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Centro de Astrofísica da Universidade do Porto

Genus Statistics for Structure Formation with Topological Defects

P. P. Avelino

I study the efficiency of genus statistics in differentiating between different models of structure formation. Simple models that reproduce the salient features of the structure that are seeded by topological defects are examined. I consider accretion onto static point masses, modeling slow-moving cosmic string loops or other primordial pointlike sources. Filamentary structures and wakes are considered as models of the structures seeded by slow- and fast-moving strings, respectively. The predictions of genus statistics for Gaussian fluctuations are compared to genus curves obtained by the CfA Redshift Survey. A generic class of density models with wakes and filaments is found to provide results comparable to or better than Gaussian models for this suite of tests.

The Astrophysical Journal
Volume 487, Page 18
September 1997

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Institute of Astrophysics and Space Sciences

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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