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With the advent of the first luminous sources at Cosmic Dawn (CD), theredshifted 21-cm signal, from the neutral hydrogen in the Inter-Galactic Medium(IGM), is predicted to undergo a transition from absorption to emission againstthe CMB. Using simulations, we show that the redshift evolution of the sign andthe magnitude of the 21-cm bispectrum can disentangle the contributions fromLy$\alpha$ coupling and X-ray heating of the IGM, the two most dominantprocesses which drive this transition. This opens a new avenue to probe thefirst luminous sources and the IGM physics at CD.

Probing IGM Physics during Cosmic Dawn using the Redshifted 21-cm Bispectrum