We present the WebSky[CII] line-intensity mock maps and forecast the capabilities of upcoming wide-field submillimeter-wave surveys of cosmological [CII] emission from the epoch of reionization (EoR). Using the PeakPatch algorithm to generate light-cone dark matter (DM) halo catalogues and the WebSky framework to forward-model the cosmological [CII] signal, we construct tomographic mock surveys matched to the CCAT Observatory. We investigate both astrophysical models of [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 [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 PeakPatch 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 WebSky[CII] mocks and corresponding PeakPatch halo catalogues are publicly available at https://uoft.me/webskycii .
@article{arxiv.2510.18312,
title = {The $\mathtt{WebSky}$ $\mathrm{[CII]}$ Forecasts and the search for primordial intermittent non-Gaussianity},
author = {Nathan J. Carlson and J. Richard Bond and Dongwoo T. Chung and Patrick Horlaville and Thomas Morrison},
journal= {arXiv preprint arXiv:2510.18312},
year = {2025}
}