%0 Generic %1 choudhury2020constraints %A Choudhury, Tirthankar Roy %A Mukherjee, Suvodip %A Paul, Sourabh %D 2020 %K library %T CMB constraints on a physical model of reionization %U http://arxiv.org/abs/2007.03705 %X We study constraints on allowed reionization histories by comparing predictions of a physical semi-numerical model with secondary temperature and polarization anisotropies of the cosmic microwave background (CMB). Our model has four free parameters characterizing the evolution of ionizing efficiency $\zeta$ and the minimum mass $M_min$ of haloes that can produce ionizing radiation. Comparing the model predictions with the presently available data of the optical depth $\tau$ and kinematic Sunyaev-Zeldovich signal, we find that we can already rule out a significant region of the parameter space. We limit the duration of reionization $\Delta z=1.30^+0.19_-0.60$ ($\Delta z < 2.9$ at $99\%$ C.L.), one of the tightest constraints on the parameter. The constraints mildly favour $M_min 10^9 M_ødot$ (at $68\%$ C.L.) at $z 8$, thus indicating the presence of reionization feedback. Our analysis provides an upper bound on the secondary $B$-mode amplitude $D_l=200^BB<18$ nK$^2$ at $99\%$ C.L. We also study how the constraints can be further tightened with upcoming space and ground-based CMB missions. Our study, which relies solely on CMB data, has implications not only for upcoming CMB surveys for detecting primordial gravitational waves but also redshifted 21 cm studies.

@misc{choudhury2020constraints, abstract = {We study constraints on allowed reionization histories by comparing predictions of a physical semi-numerical model with secondary temperature and polarization anisotropies of the cosmic microwave background (CMB). Our model has four free parameters characterizing the evolution of ionizing efficiency $\zeta$ and the minimum mass $M_{\mathrm{min}}$ of haloes that can produce ionizing radiation. Comparing the model predictions with the presently available data of the optical depth $\tau$ and kinematic Sunyaev-Zeldovich signal, we find that we can already rule out a significant region of the parameter space. We limit the duration of reionization $\Delta z=1.30^{+0.19}_{-0.60}$ ($\Delta z < 2.9$ at $99\%$ C.L.), one of the tightest constraints on the parameter. The constraints mildly favour $M_{\mathrm{min}} \gtrsim 10^9 \mathrm{M}_{\odot}$ (at $68\%$ C.L.) at $z \sim 8$, thus indicating the presence of reionization feedback. Our analysis provides an upper bound on the secondary $B$-mode amplitude $D_{l=200}^{BB}<18$ nK$^2$ at $99\%$ C.L. We also study how the constraints can be further tightened with upcoming space and ground-based CMB missions. Our study, which relies solely on CMB data, has implications not only for upcoming CMB surveys for detecting primordial gravitational waves but also redshifted 21 cm studies.}, added-at = {2020-07-09T05:19:25.000+0200}, author = {Choudhury, Tirthankar Roy and Mukherjee, Suvodip and Paul, Sourabh}, biburl = {https://www.bibsonomy.org/bibtex/276d47c0c86fcef7c5fa9555ff96080ea/gpkulkarni}, description = {CMB constraints on a physical model of reionization}, interhash = {88e5cfdfad049758e75910aebc2cae30}, intrahash = {76d47c0c86fcef7c5fa9555ff96080ea}, keywords = {library}, note = {cite arxiv:2007.03705Comment: 5 pages}, timestamp = {2020-07-09T05:19:25.000+0200}, title = {CMB constraints on a physical model of reionization}, url = {http://arxiv.org/abs/2007.03705}, year = 2020 }