title: The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes
creator: Schleicher, Dominik Reinhold Georg
subject: 520
subject: 520 Astronomy and allied sciences
description: 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.
date: 2009
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/9607/1/thesisDSchleicher.pdf
identifier: DOI:10.11588/heidok.00009607
identifier: urn:nbn:de:bsz:16-opus-96077
identifier:   Schleicher, Dominik Reinhold Georg  (2009) The Early Universe : Probing Primordial Magnetic Fields, Dark Matter Models and the First Supermassive Black Holes.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/9607/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng