We present the $\mathtt{ WebSky}$ $\mathrm{ [CII]}$ line-intensity mock maps and forecast the capabilities of upcoming wide-field submillimeter-wave surveys of cosmological $\mathrm{ [CII]}$ emission from the epoch of reionization (EoR). Using the $\mathtt{ Peak~Patch}$ algorithm to generate light-cone dark matter (DM) halo catalogues and the $\mathtt{ WebSky}$ framework to forward-model the cosmological $\mathrm{ [CII]}$ signal, we construct tomographic mock surveys matched to the CCAT Observatory. We investigate both astrophysical models of $\mathrm{ [CII]}$ emission from interstellar gas and the potential for the study of primordial intermittent non-Gaussianity (PING) as a science case for Stage 2 line intensity mapping (LIM) surveys. The $\mathrm{ [CII]}$ voxel intensity distribution (VID) is used as a summary statistic in forecasts. Additional constraints on PING are derived from a relative entropy study of $\mathtt{ Peak~Patch}$ halo mass functions. We show that upcoming LIM surveys will provide insights into the way we model cosmological line emission, and next-generation surveys can place competitive bounds on novel inflationary scenarios such as PING. The $\mathtt{ WebSky}$ $\mathrm{ [CII]}$ mocks and corresponding $\mathtt{ Peak~Patch}$ halo catalogues are publicly available at https://uoft.me/webskycii .
Categories: astro-ph.CO