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The Tianlai experiment is dedicated to the observation of large scalestructures (LSS) by the 21 cm intensity mapping technique. In this paper wemake forecasts on its capability at observing or constraining the dark energyparameters and the primordial non-Gaussianity. From the LSS data one can usethe baryon acoustic oscillation (BAO) and the growth rate derived from theredshift space distortion (RSD) to measure the dark energy density and equationof state. The primordial non-Gaussianity can be constrained either by lookingfor scale-dependent bias in the power spectrum, or by using the bispectrum.Here we consider three cases: the Tianlai cylinder array pathfinder which iscurrently being built, an upgrade of the pathfinder array with more receiverunits, and the full-scale Tianlai cylinder array. Using the full-scale Tianlaiexperiment, we expect $\sigma_{w_0} \sim 0.082$ and $\sigma_{w_a} \sim 0.21$from the BAO and RSD measurements, $\sigma_{\rm f_{NL}}^{\rm local} \sim 14$from the power spectrum measurements with scale-dependent bias, and$\sigma_{\rm f_{NL}}^{\rm local} \sim 22$ and $\sigma_{\rm f_{NL}}^{\rm equil}\sim 157$ from the bispectrum measurements.

Forecasts on the Dark Energy and Primordial Non-Gaussianity Observations with the Tianlai Cylinder Array