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From 100 kpc to 10 Gpc: Dark Matter self-interactions before and after DESI

5 Pith papers cite this work. Polarity classification is still indexing.

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abstract

We consider Dark Matter self-interactions mediated by ultralight scalars. We show that effectively massless mediators lead to an enhancement of the matter power spectrum, while heavier mediators lead to a suppression, together with a feature around their Jeans scale. We derive the strongest present constraints by combining Planck and BOSS data. The recent DESI measurements of Baryon Acoustic Oscillations exhibit a mild $2\sigma$ preference for long-range self-interactions, as strong as $4$ per mille of the gravitational coupling. Full-shape analyses of forthcoming DESI and Euclid data will confirm or disprove such a hint.

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2026 2 2025 3

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representative citing papers

Multi-species Dark Matter with Warmth and Randomness

astro-ph.CO · 2025-10-16 · unverdicted · novelty 7.0

Presents a general analytic framework based on truncated BBGKY hierarchy solved via Volterra equations for computing power spectra in multi-species dark matter with finite velocity dispersion and Poisson fluctuations.

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