%0 Generic %1 chen2021reionization %A Chen, Lu %A Wang, Ke %D 2021 %K library %T Does the Reionization Model Influence the Constraints on Dark Matter Decay or Annihilation? %U http://arxiv.org/abs/2106.05509 %X If dark matter decay or annihilate, a large amount of energy and particles would be released into the cosmic plasma. Therefore, they could modify the thermal and ionization history of our universe, then leave footprints on the cosmic microwave background power spectra. In this paper, we take dark matter annihilation as an example and investigate whether different reionization models influence the constraints on dark matter annihilation. We reconstruct the ionization history including both dark matter annihilation and star formation, then put constraints on DM annihilation. Combining the latest Planck data, BAO data, SNIa measurement, star formation rate density from UV and IR data, the upper limit of $\epsilon_0 f_d$ reads $2.776510^-24$ at 95$\%$C.L.. By comparison, we also constrain dark matter annihilation in the instantaneous reionization model from the same data combination except star formation rate density, and the upper limit of $\epsilon_0 f_d$ is $2.846810^-24$ at 95$\%$C.L., which is $2.5\%$ higher than the results in the previous model. This indicates various reionization models have little influence on constraining parameters of dark matter decay or annihilation.

@misc{chen2021reionization, abstract = {If dark matter decay or annihilate, a large amount of energy and particles would be released into the cosmic plasma. Therefore, they could modify the thermal and ionization history of our universe, then leave footprints on the cosmic microwave background power spectra. In this paper, we take dark matter annihilation as an example and investigate whether different reionization models influence the constraints on dark matter annihilation. We reconstruct the ionization history including both dark matter annihilation and star formation, then put constraints on DM annihilation. Combining the latest Planck data, BAO data, SNIa measurement, star formation rate density from UV and IR data, the upper limit of $\epsilon_0 f_d$ reads $2.7765\times 10^{-24}$ at 95$\%$C.L.. By comparison, we also constrain dark matter annihilation in the instantaneous reionization model from the same data combination except star formation rate density, and the upper limit of $\epsilon_0 f_d$ is $2.8468\times 10^{-24}$ at 95$\%$C.L., which is $2.5\%$ higher than the results in the previous model. This indicates various reionization models have little influence on constraining parameters of dark matter decay or annihilation.}, added-at = {2021-06-11T06:32:17.000+0200}, author = {Chen, Lu and Wang, Ke}, biburl = {https://www.bibsonomy.org/bibtex/295565eef52921905782da9e1dee0e3c9/gpkulkarni}, description = {Does the Reionization Model Influence the Constraints on Dark Matter Decay or Annihilation?}, interhash = {861751b51484e344705ae4b3d00f227e}, intrahash = {95565eef52921905782da9e1dee0e3c9}, keywords = {library}, note = {cite arxiv:2106.05509Comment: 8 pages, 2 figures}, timestamp = {2021-06-11T06:32:17.000+0200}, title = {Does the Reionization Model Influence the Constraints on Dark Matter Decay or Annihilation?}, url = {http://arxiv.org/abs/2106.05509}, year = 2021 }