<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes"^^ . "The goal of this work is to better understand the universe between recombination and reionization and to outline new possibilities to explore it in more detail. This concerns the stellar population, the physics of the early universe, and the formation of the first supermassive black holes. With the reionization optical depth from WMAP 5, I derive upper limits for the strength of primordial magnetic fields and dark matter annihilation / decay, as well as constraints for stellar population models. Further constraints can be found from the gamma-ray and neutrino background, which rule out s-wave annihilation of light dark matter. It was shown that future 21 cm observations will constrain primor- dial magnetic fields even further. To improve our understanding of the origin of the first supermassive black holes and their high metallicity, I explore how they can be observed with ALMA and JWST between redshift 5 and 15. For this purpose, I estimated and classified the available observables, and I provide several independent estimates for the expected number of high-redshift black holes. In spite of large model uncertainties, one can expect to find at least a few sources in a solid angle similar to the Hubble-Deep-Field."^^ . "2009" . . . . . . . . "Dominik Reinhold Georg"^^ . "Schleicher"^^ . "Dominik Reinhold Georg Schleicher"^^ . . . . . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes (PDF)"^^ . . . "thesisDSchleicher.pdf"^^ . . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes (Other)"^^ . . . . . . "preview.jpg"^^ . . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes (Other)"^^ . . . . . . "medium.jpg"^^ . . . "The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #9607 \n\nThe Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes\n\n" . "text/html" . . . "520 Astronomie"@de . "520 Astronomy and allied sciences"@en . .