Cosmic Microwave Background Polarization and reionization: constraining models with a double reionization

L. P. L. Colombo, G. Bernardi, L. Casarini +4

Neutral hydrogen around high-z QSO and an optical depth tau ~ 0.17 can be reconciled if reionization is more complex than a single transition at z ~ 6-8. Tracing its details could…