Modelling the 21 cm Signal From the Epoch of Reionization and Cosmic
  Dawn
  Studying the cosmic dawn and the epoch of reionization through the redshifted
21 cm line are among the major science goals of the SKA1. Their significance
lies in the fact that they are closely related to the very first stars in the
universe. Interpreting the upcoming data would require detailed modelling of
the relevant physical processes. In this article, we focus on the theoretical
models of reionization that have been worked out by various groups working in
India with the upcoming SKA in mind. These models include purely analytical and
semi-numerical calculations as well as fully numerical radiative transfer
simulations. The predictions of the 21 cm signal from these models would be
useful in constraining the properties of the early galaxies using the SKA data.
