%0 Generic %1 satopolito2020kinetic %A Sato-Polito, Gabriela %A Bernal, José Luis %A Boddy, Kimberly K. %A Kamionkowski, Marc %D 2020 %K library %T Kinetic Sunyaev-Zel'dovich tomography with line-intensity mapping %U http://arxiv.org/abs/2011.08193 %X The kinetic Sunyaev-Zel'dovich (kSZ) effect is a secondary cosmic microwave background (CMB) anisotropy induced by the scattering of CMB photons off intervening electrons. Through cross-correlations with tracers of large-scale structure, the kSZ effect can be used to reconstruct the 3-dimensional radial-velocity field, a technique known as kSZ tomography. We explore the cross-correlation between the CMB and line-intensity fluctuations to retrieve the late-time kSZ signal across a wide redshift range. We focus on the CII emission line, and predict the signal-to-noise ratio of the kSZ tomography signal between redshifts $z=1-5$ for upcoming experiments. We show that while instruments currently under construction may reach a low-significance detection of kSZ tomography, next-generation experiments will achieve greater sensitivity, with a detection significance of $O(10^2-10^3)$. Due to sample-variance cancellation, the cross-correlation between the reconstructed velocity field from kSZ tomography and intensity fluctuations can improve measurements of %the scale-dependent bias contributions from new physics to the power spectrum at large scales. To illustrate this improvement, we consider models of the early Universe that induce primordial local-type non-gaussianity and correlated compensated isocurvature perturbations. We show that with CMB-S4 and an AtLAST-like survey, the uncertainty on $f_NL$ and $A_CIP$ can be reduced by a factor of $3$, achieving $\sigma(f_NL) łesssim 1$. We further show that probing both low and high redshifts is crucial to break the degeneracy between the two parameters.

@misc{satopolito2020kinetic, abstract = {The kinetic Sunyaev-Zel'dovich (kSZ) effect is a secondary cosmic microwave background (CMB) anisotropy induced by the scattering of CMB photons off intervening electrons. Through cross-correlations with tracers of large-scale structure, the kSZ effect can be used to reconstruct the 3-dimensional radial-velocity field, a technique known as kSZ tomography. We explore the cross-correlation between the CMB and line-intensity fluctuations to retrieve the late-time kSZ signal across a wide redshift range. We focus on the CII emission line, and predict the signal-to-noise ratio of the kSZ tomography signal between redshifts $z=1-5$ for upcoming experiments. We show that while instruments currently under construction may reach a low-significance detection of kSZ tomography, next-generation experiments will achieve greater sensitivity, with a detection significance of $\mathcal{O}(10^2-10^3)$. Due to sample-variance cancellation, the cross-correlation between the reconstructed velocity field from kSZ tomography and intensity fluctuations can improve measurements of %the scale-dependent bias contributions from new physics to the power spectrum at large scales. To illustrate this improvement, we consider models of the early Universe that induce primordial local-type non-gaussianity and correlated compensated isocurvature perturbations. We show that with CMB-S4 and an AtLAST-like survey, the uncertainty on $f_{\rm NL}$ and $A_{\rm CIP}$ can be reduced by a factor of $\sim 3$, achieving $\sigma(f_{\rm NL}) \lesssim 1$. We further show that probing both low and high redshifts is crucial to break the degeneracy between the two parameters.}, added-at = {2020-11-18T06:17:10.000+0100}, author = {Sato-Polito, Gabriela and Bernal, José Luis and Boddy, Kimberly K. and Kamionkowski, Marc}, biburl = {https://www.bibsonomy.org/bibtex/27b259ed1f51f657f912563d55f1767fe/gpkulkarni}, description = {Kinetic Sunyaev-Zel'dovich tomography with line-intensity mapping}, interhash = {ea18e25d08d3b6f22ebf1e320f5b67a8}, intrahash = {7b259ed1f51f657f912563d55f1767fe}, keywords = {library}, note = {cite arxiv:2011.08193Comment: 13 pages, 5 figures}, timestamp = {2020-11-18T06:17:10.000+0100}, title = {Kinetic Sunyaev-Zel'dovich tomography with line-intensity mapping}, url = {http://arxiv.org/abs/2011.08193}, year = 2020 }