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Constraints on local primordial non-Gaussianity with 3d Velocity Reconstruction from the Kinetic Sunyaev-Zeldovich Effect

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arxiv 2411.08240 v2 pith:7DJIF537 submitted 2024-11-12 astro-ph.CO gr-qc

Alex Laguë , Mathew S. Madhavacheril , Kendrick M. Smith , Simone Ferraro , Emmanuel Schaan This is my paper
classification astro-ph.COgr-qc
keywords velocityeffectfieldconstraintscosmicdatagalaxygalaxy-velocity
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abstract

The cosmic velocity field is an unbiased probe of the total matter distribution but is challenging to measure directly at intermediate and high redshifts. The large-scale velocity field imprints a signal in the cosmic microwave background (CMB) through the kinetic Sunyaev-Zeldovich (kSZ) effect. We perform the first 3d reconstruction of the large-scale velocity field from the kSZ effect by applying a quadratic estimator to CMB temperature maps and the 3d positions of galaxies. We do so by combining CMB data from the fifth data release of the Atacama Cosmology Telescope (in combination with Planck) and a spectroscopic galaxy sample from the Sloan Digital Sky Survey. We then measure the galaxy-velocity cross-power spectrum and detect the presence of the kSZ signal at a signal-to-noise ratio of 7.2$\sigma$. Using this galaxy-velocity cross-correlation alone, we constrain the amplitude of local primordial non-Gaussianity finding $f_{\rm NL}=-90^{+210}_{-350}$. This pathfinder measurement sets the stage for joint galaxy-CMB kSZ constraints to significantly enhance the $f_{\rm NL}$ information obtained from galaxy surveys through sample variance cancellation.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Shear-kSZ: A New Estimator for the Matter-Electron Power Spectrum from kSZ Tomography and Weak Lensing

    astro-ph.CO 2026-07 conditional novelty 7.0 of 10

    Shear–kSZ correlates kSZ, tomographic line-of-sight velocity, and lensing convergence to measure P_me(k) and thereby the baryonic matter-power suppression S(k) at high forecast significance.

  2. Optimal and exact wide-angle power spectrum estimation

    astro-ph.CO 2026-07 accept novelty 7.0 of 10

    For finite-rank signals the optimal wide-angle estimator is the two-ℓ Yamamoto form, whose exact window is a finite FFT-computable sum that improves ultra-large-scale SNR by O(1).

  3. Direct shear $\times$ kSZ correlation: controlling baryons without modeling galaxies

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    A shear×velocity kSZ template cross-correlated with the CMB is forecast to measure the electron–matter power spectrum to few-percent (ACT/SO) or sub-percent (CMB-HD) precision.

  4. Constraints on the remote quadrupole field from the polarized Sunyaev Zel'dovich effect

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    A first pSZ bispectrum search with Planck/ACT and unWISE/CIB data finds no signal, giving b_q=1.02±2.64 and τ_rei=−0.01±0.14.

  5. Velocity Reconstruction from KSZ: Measuring $f_{NL}$ with ACT and DESILS

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    The first 3D velocity reconstruction from a photometric galaxy survey detects the galaxy-velocity power spectrum at 11.7 sigma and constrains fNL = -39 +40/-33.

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