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Is the Harrison-Zel'dovich spectrum coming back? ACT preference for $n_s \sim 1$ and its discordance with Planck

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arxiv 2210.09018 v2 pith:663YDCJJ submitted 2022-10-17 astro-ph.CO

William Giarè , Fabrizio Renzi , Olga Mena , Eleonora Di Valentino , Alessandro Melchiorri This is my paper
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keywords datadovichharrison-zelplanckpolarizationspectrumtensionaddition
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abstract

The Data Release 4 of the Atacama Cosmology Telescope (ACT) shows an agreement with an Harrison-Zel'dovich primordial spectrum ($n_s=1.009 \pm 0.015$), introducing a tension with a significance of $99.3\%$ CL with the results from the Planck satellite. The discrepancy on the value of the scalar spectral index is neither alleviated with the addition of large scale structure information nor with the low multipole polarization data. We discuss possible avenues to alleviate the tension relying on either neglecting polarization measurements from ACT or in extending different sectors of the theory.

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Cited by 2 Pith papers

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

  1. Tightening constraints on primordial oscillations with latest ACT and SPT data

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

    Combining ACT DR6, SPT-3G D1, and Planck CMB data tightens the 95% upper limits on primordial oscillation amplitudes to about 0.029, with no significant signal.

  2. Can the universe experience an AdS landscape since matter-radiation equality?

    gr-qc 2025-06 conditional novelty 5.0 of 10

    A universe with an AdS (negative cosmological constant) phase at recombination and another at low redshift is compatible with Planck, DESI, Pantheon Plus and SH0ES data, though not preferred by them.

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