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Measuring Dark Energy Clustering with CMB-Galaxy Correlations

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arxiv astro-ph/0408456 v2 pith:SRFIEKM3 submitted 2004-08-24 astro-ph

Wayne Hu (KICP) , Ryan Scranton (U. Pitt.) This is my paper · ORCID
classification astro-ph
keywords clusteringdarkenergyscalecorrelationdensityquintessenceall-sky
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The integrated Sachs-Wolfe (ISW) effect in the cosmic microwave background (CMB) as measured through its correlation with galaxies provides a unique opportunity to study the dynamics of the dark energy through its large scale clustering properties. Ultimately, a deep all-sky galaxy survey out to z~2 can make a 10sigma or ~10% measurement of the correlation and limit ~3% changes in the gravitational potential or total density fluctuation due to dark energy clustering on the Gpc scale. A canonical single scalar field or quintessence model predicts that these clustering effects will appear on the horizon scale with a strength that reflects the evolution of the dark energy density. In terms of a constant equation of state, this would allow tests of the quintessence prediction for models where |1+w| > 0.05.

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Cited by 3 Pith papers

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

  1. Sound Mode and Scale-Dependent Growth in Two-Fluid Dynamical Dark Energy

    astro-ph.CO 2026-03 conditional novelty 6.0 of 10

    DDE sound modes induce scale-dependent growth and halo bias comparable to massless neutrinos; multi-tracer P+B forecasts detect it for c_s^{2} ~ 10^{-2}–10^{-4}, while lower speeds produce ~10% drag on cluster growth-...

  2. Probing Dark Energy Microphysics with kSZ Tomography

    astro-ph.CO 2025-11 conditional novelty 5.0 of 10

    Fisher-matrix forecasts for LSST- and CMB-S4-like surveys show kSZ tomography tightens constraints on dark energy parameters w0 and wa by 15% and 32% while assessing detectability of perturbations for different sound speeds.

  3. The Status of Single Scalar Field Dark Energy

    astro-ph.CO 2026-07 conditional novelty 4.5 of 10

    Cosmological data can constrain only a handful of EFT parameters for single-scalar dark energy; extended models show modest preference over Λ but remain underdetermined and challenged by fifth forces and screening.

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