Quasar Constraints on the Cosmic String Models

Details Quasar Constraints on the Cosmic String Models Quasar Constraints on the Cosmic String Models

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454l..81m&link_type=abstract

Astrophysical Journal Letters v.454, p.L81

Astronomy and Astrophysics

Astronomy

6

Cosmic Strings, Cosmology: Theory, Cosmology: Large-Scale Structure Of Universe, Quasars

Scientific paper

The number densities of quasars and high-redshift galaxies introduce strict constraints on theories of large-scale structure formation. We compute the comoving space densities of these objects with cosmic string models and compare results with observations. We show that the cosmic string models can produce enough high-density objects to account for the observations. We also show that, because of non-Gaussian initial conditions, the number density of quasars is higher than expected from conventional Gaussian Press-Schechter analysis. The cosmic string model is consistent with the QSO abundance limit at z = 4.5, both in Omega = 1.0 and in Omega = 0.2 cases. However, there are problems with large-scale structure when the "stringy" power spectrum is compared with the three-dimensional Automatic Plate Measuring Facility (APM) spectrum in Cambridge, England.

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