Full-sky bispectrum in redshift space for 21cm intensity maps

@article{Durrer2020FullskyBI,
  title={Full-sky bispectrum in redshift space for 21cm intensity maps},
  author={Ruth Durrer and Mona Jalilvand and Rahul Kothari and Roy Maartens and Francesco Montanari},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2020}
}
We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in the directly observable angular and redshift space, focusing on equal-redshift correlations and thin redshift bins, for which the lensing contribution is negligible. We demonstrate the importance of the contributions from redshift-space distortions which typically dominate the result. Taking into account the effects of telescope beams and foreground cleaning, we estimate the signal to noise and show… 
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References

SHOWING 1-10 OF 50 REFERENCES
The full-sky angular bispectrum in redshift space
We compute the redshift-dependent angular bispectrum of galaxy number counts at tree-level, including nonlinear clustering bias and estimating numerically for the first time the effect of redshift
Cosmological information in the redshift-space bispectrum
We use the Fisher-matrix formalism to investigate whether the galaxy bispectrum in redshift space, B, contains additional cosmological information with respect to the power spectrum, P. We focus on a
Speeding up the detectability of the harmonic-space galaxy bispectrum
We present a method that allows us for the first time to estimate the signal-to-noise ratio (SNR) of the harmonic-space galaxy bispectrum induced by gravity, a complementary probe to already well
The gravitational and lensing-ISW bispectrum of 21 cm radiation
Cosmic Microwave Background experiments from COBE to Planck, have launched cosmology into an era of precision science, where many cosmological parameters are now determined to the percent level. Next
The bispectrum of relativistic galaxy number counts
We discuss the dominant terms of the relativistic galaxy number counts to second order in cosmological perturbation theory on sub-Hubble scales and on intermediate to large redshifts. In particular,
Imprints of local lightcone \ projection effects on the galaxy bispectrum. Part II
General relativistic imprints on the galaxy bispectrum arise from observational (or projection) effects. The lightcone projection effects include local contributions from Doppler and gravitational
Detecting the relativistic galaxy bispectrum
The Fourier-space galaxy bispectrum is complex, with the imaginary part arising from leading-order relativistic corrections, due to Doppler, gravitational redshift and related line-of-sight effects
LATE-TIME COSMOLOGY WITH 21CM INTENSITY MAPPING EXPERIMENTS
We present a framework for forecasting cosmological constraints from future neutral hydrogen intensity mapping experiments at low to intermediate redshifts. In the process, we establish a simple way
Calibrating photometric redshifts with intensity mapping observations
Imaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen will have accurate redshift resolution yet will
The dipole of the galaxy bispectrum
The bispectrum will play an important role in future galaxy surveys. On large scales it is a key probe for measuring primordial non-Gaussianity which can help differentiate between different
...
...