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# Cosmological contribution from population III stars in ultracompact minihalos

Jul 2022

In this work, we investigated the effect of the cosmic ionization historyfrom Population~III~(Pop.~III) stars in ultracompact minihalos~(UCMHs) usingPlanck observation data. Although high-redshift astrophysics is not understoodyet, UCMHs could host the Pop.~III stars like the halos formed in the standardstructure formation scenario. Such Pop.~III stars would emit ionizing photonsduring their main sequence and facilitate the cosmic reionization in highredshift. To study the effect of the global ionization, we model the cosmicreionization evolution based on the "tanh"-type reionization model which isexpressed by $z_{\mathrm{reio}}$ with additional two parameters characterizingthe initial mass of UCMHs and the number density of UCMHs. We have implementedthe Monte Carlo Markov Chain analysis with the latest Planck observation datafor our reionization model. As the result, we found that if the UCMH initialmass is larger than $10^{8.4}\mathrm{M}_{\odot}$, the number density of UCMHsare strictly limited. Then we obtained the constraint on the amplitude ofprimordial power spectrum through the constraint on the UCMH number densitylike $\mathcal{A}_{\zeta}\sim 10^{-9}$ in the scales, $k\lesssim50\mathrm{Mpc}^{-1}$, when we fix $z_{\mathrm{reio}}=6$.

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