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Non-standard neutrino cosmology dilutes the lensing anomaly

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arxiv 2202.04656 v2 pith:ZUVLI2WR submitted 2022-02-09 astro-ph.CO hep-ph

classification astro-ph.COhep-ph
keywords lensinganomalyneutrinocosmologicaldespiteneutrinosrolestandard
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Despite the impressive success of the standard cosmological model, several anomalies defy its triumph. Among them is the so-called lensing anomaly: the Planck satellite observes stronger CMB gravitational lensing than expected. The role of neutrinos in this anomaly has been mostly overlooked, despite their key role in CMB lensing, because in the standard scenario they tend to increase the tension. Here, we show that this strongly depends on the assumed neutrino equation of state. We demonstrate that if neutrinos have yet undiscovered long-range interactions, the lensing pattern is significantly affected, rendering the lensing anomaly as a statistical fluctuation. Our results thus open up a window to link anomalous CMB lensing with present and future cosmological, astrophysical, and laboratory measurements of neutrino properties.

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  1. Probing Long-Range Forces Between Neutrinos with Cosmic Structures

    hep-ph 2024-12 conditional novelty 5.0 of 10

    Neutrino long-range forces stronger than gravity would make the cosmic neutrino background collapse into bound states, and existing matter power spectrum and reionization data now exclude a band of couplings for force...

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