The Epoch of Reionization 21-cm bispectrum: the impact of light-cone effects and detectability

We study the spherically averaged bispectrum of 21-cm signal from Epoch Reionization (EoR). This metric provides a quantitative measurement level non-Gaussianity which is expected to be high. focus on impact light-cone effect and its detectability with future SKA-Low telescope. Our investigation based single reionization model an ensemble 50 realisations estimate cosmic variance errors. calculate new, optimised direct estimation method, DviSukta calculates for all possible unique triangles. find that becomes important scales $k_1 \lesssim 0.1\,{\rm Mpc}^{-1}$ where most triangle shapes errors dominate. Only squeezed limit triangles, exceeds variance. Combining effects system noise we $\sim 3\sigma$ detection around scale \sim 0.2\,{\rm Mpc}^{-1}$, dominate above below this length scale. triangles are able achieve more than $5\sigma$ significance over wide range scales, 0.8\,{\rm Mpc}^{-1}$. results suggest among combinations bispectrum, one will measurable hence useful.