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Lyman-$\alpha$ Constraints on Cosmic Heating from Dark Matter Annihilation and Decay

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arxiv 2008.01084 v2 pith:NDNGAOKP submitted 2020-08-03 astro-ph.CO hep-ph

Hongwan Liu , Wenzer Qin , Gregory W. Ridgway , Tracy R. Slatyer This is my paper · ORCID
classification astro-ph.COhep-ph
keywords constraintsalphadarklyman-matterreionizationaccountadditional
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abstract

We derive new constraints on models of decaying and annihilating dark matter (DM) by requiring that the energy injected into the intergalactic medium (IGM) not overheat it at late times, when measurements of the Lyman-$\alpha$ forest constrain the IGM temperature. We improve upon previous analyses by using the recently developed $\texttt{DarkHistory}$ code package, which self-consistently takes into account additional photoionization and photoheating processes due to reionization and DM sources. Our constraints are robust to the uncertainties of reionization and competitive with leading limits on sub-GeV DM that decays preferentially to electrons.

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Cited by 4 Pith papers

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

  1. Search for Dark Matter Annihilation and Decay with H$\alpha$ Line Emission

    hep-ph 2025-12 conditional novelty 7.0 of 10

    H-alpha line emission from recombining gas in quiet dwarf galaxies is a new probe of dark matter annihilation/decay, giving leading limits for some dark matter masses.

  2. Cosmological constraints on TeV-scale dark matter subcomponents decaying between recombination and reionisation

    astro-ph.CO 2026-04 conditional novelty 6.0 of 10

    Future global 21-cm observations could beat CMB limits on TeV-scale decaying dark matter for lifetimes ≳10^15 s, especially for decays into neutrinos.

  3. Minimal Majoron Dark Matter from a Discrete $Z_N$ Gauge Symmetry

    hep-ph 2026-07 conditional novelty 5.0 of 10

    Discrete Z_N-protected majoron dark matter excludes Z_5, leaves Z_7/Z_11/Z_13 viable, and predicts a 1–10 MeV Z_7 majoron testable by COSI through 511 keV and γγ lines.

  4. Prospects for probing dark matter particles and primordial black holes with the Hongmeng mission using the 21 cm global spectrum at cosmic dawn

    astro-ph.CO 2024-12 conditional novelty 5.0 of 10

    A Fisher-matrix forecast finds the Hongmeng 21 cm global spectrum mission could probe DM annihilation cross sections down to ~1e-28 cm3/s, decay lifetimes to ~1e28 s, and PBH abundances to f_PBH ~ 1e-6, under ideal no...

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