CMB and density fluctuations from strings plus inflation
摘要
In cosmological models where local cosmic strings are formed at the end of a period of inflation, the perturbations are seeded both by the defects and by the quantum fluctuations. In a subset of these models, for example those based on -term inflation, the amplitudes are similar. Using our recent calculations of structure formation with cosmic strings, we point out that in a flat cosmology with zero cosmological constant and 5% baryonic component, strings plus inflation fits the observational data much better than each component individually. The large-angle CMB spectrum is mildly tilted, for Harrison-Zeldovich inflationary fluctuations. It then rises to a thick Doppler bump, covering , modulated by soft secondary undulations. The standard CDM anti-biasing problem is cured, giving place to a slightly biased scenario of galaxy formation.
引用
@article{arxiv.astro-ph/9809053,
title = {CMB and density fluctuations from strings plus inflation},
author = {Carlo Contaldi and Mark Hindmarsh and Joao Magueijo},
journal= {arXiv preprint arXiv:astro-ph/9809053},
year = {2009}
}