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Reionization: A probefor the stellarpopulation and thephysics of the earlyuniverse D. R. G. SchleicherRobi BanerjeeRalf S. Klessen2008 год

Reionization: A probe for the stellar population and the physics of the early universe
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Аннотация: We calculate the reionization history for different models of the stellar population and explore the effects of primordial magnetic fields, dark matter decay and dark matter annihilation on reionization. We find that stellar populations based on a Scalo-type initial mass function for Population II stars can be ruled out as sole sources for reionization, unless star formation efficiencies of more than 10% or very high photon escape fractions from the parental halo are adopted. When considering primordial magnetic fields, we find that the additional heat injection from ambipolar diffusion and decaying MHD turbulence has a significant impact on the thermal evolution and the ionization history of the post-recombination universe and on structure formation. The magnetic Jeans mass changes the typical mass scale of the star-forming halos, and depending on the adopted stellar model we derive upper limits to the magnetic field strength between 0.7 and 5 nG (comoving). For dark matter annihilation, we find an upper limit to the thermally averaged mass-weighted cross section of $⟨\ensuremath{\sigma}v⟩/{m}_{\mathrm{DM}}\ensuremath{\le}{10}^{\ensuremath{-}33}\text{ }\text{ }{\mathrm{cm}}^{3}/\mathrm{s}/\mathrm{eV}$. For dark matter decay, our calculations yield a lower limit to the lifetime of dark matter particles of $\ensuremath{\tau}\ensuremath{\ge}3\ifmmode\times\else\texttimes\fi{}{10}^{23}\text{ }\text{ }\mathrm{s}$. These limits are in agreement with constraints from recombination and provide an independent confirmation at a much later epoch.
Год издания: 2008
Авторы: D. R. G. Schleicher, Robi Banerjee, Ralf S. Klessen
Издательство: American Physical Society
Источник: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology
Ключевые слова: Stellar, planetary, and galactic studies, Galaxies: Formation, Evolution, Phenomena, Astronomy and Astrophysical Research
Другие ссылки: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
DataCite API (HTML)