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Cosmology with millimeter-wavelength intensity mapping: forecast and modelling

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Line intensity mapping (LIM) is emerging as a powerful technique to map the cosmic large-scale structure. Measurement of spatial fluctuations in the intensity of spectral lines together with their observed frequency provide a low-resolution, 3-dimensional map of the structure over a wide range of scales and redshifts. Among various line candidate, rotational lines of carbon monoxide, CO(J->J-1), and the fine structure line of ionized carbon, [CII], are two of the most studied ones. In the first part of the talk, I will discuss the prospects of future ground-based mm-wavelength LIM surveys, capable of measuring power spectrum of CO and [CII] lines, in constraining properties of neutrinos and light relics. I will then describe the optimal instrument design and survey strategy to reach the required sensitivity. In the second part of the talk, after discussing some of the shortcomings of the existing models of line intensity power spectrum, I will present an extended halo model, which accounts for nonlineaities of dark matter and biasing relation, as well as the shot-noise contributions beyond Possion approximation. I will then show the comparison of the model predictions against simulated intensity maps.

This talk is part of the Cosmology Lunch series.

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