Coupling parsec and gigaparsec scales: primordial non-Gaussianity with multi-tracer intensity mapping

Understand

Primordial non-Gaussianity (PNG) is a key probe of the origins of primordial fluctuations in the early universe.

• It has been shown that multi-tracer measurements of large-scale structure can produce high-precision measurements of PNG.
• Future line intensity mapping surveys are well-suited to these measurements owing to their ability to rapidly survey large volumes and access the large scales at which PNG becomes important.
• In this paper, we explore for the first time how multi-tracer PNG measurements with intensity mapping surveys depend on the sub-galactic scale physics which drives line emission.