Reionization - A probe for the stellar population and the physics of the early universe

Abstract

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 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 $10^{-33}{\mathrm{cm}}^3/s/eV$. For dark matter decay, our calculations yield a lower limit to the lifetime of dark matter particles of $3\times 10^{23}$ s. These limits are in agreement with constraints from recombination and the X-ray background and provide an independent confirmation at a much later epoch.

13 pages, 10 figures, accepted for publication at Phys.Rev.D

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Cited by in corpus (22)

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• Constraining the primordial initial mass function with stellar archaeology
• Relative Role of Stars and Quasars in Cosmic Reionization
• The influence of magnetic fields on the thermodynamics of primordial star formation
• Dark stars: Implications and constraints from cosmic reionization and extragalactic background radiation
• Disk fragmentation and the formation of population III stars
• Low-metallicity star formation: Relative impact of metals and magnetic fields
• Constraining spinning primordial black holes with global 21-cm signal
• Black Holes in our Galactic Halo: Compatibility with FGST and PAMELA Data and Constraints on the First Stars
• Primordial magnetic fields during the cosmic dawn in light of EDGES 21-cm signal
• LiteBIRD Science Goals and Forecasts: Primordial Magnetic Fields
• An upper limit on primordial magnetic fields from ultra-faint dwarf galaxies
• Quark-Novae, cosmic reionization, and early r-process element production
• Cosmic constraints rule out s-wave annihilation of light dark matter
• Primordial Magnetic Fields in Light of Dark Ages Global 21-cm Signal
• The formation of the first galaxies and the transition to low-mass star formation
• Random Primordial Magnetic Fields and the Gas Content of Dark Matter Halos
• Axion-Photon Conversion In Magnetized Universe: Impact On The Global 21-cm Signal
• Global Signals of the First Molecules from the Dark Ages in the Presence of Primordial Magnetic Fields
• Thermal field theories coupled to curved spacetime
• Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal
• The prospects of finding the first quasars in the universe