Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum Article Swipe

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YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2404.01378

There is a large and growing interest in observations of small-scale structure in dark matter. We propose a new way to probe dark matter structures in the $\sim 10 - 10^8 \, M_\odot$ range. This allows us to constrain the primordial power spectrum over shorter distances scales than possible with direct observations from the CMB. For $k$ in the range $\sim 10 - 1000 \, {\rm Mpc}^{-1}$ our constraints on the power spectrum are orders of magnitude stronger than previous bounds. We also set some of the strongest constraints on dark matter isocurvature perturbations. Our method relies on the heating effect such dark matter substructures would have on the distribution of stars in an ultra-faint dwarf galaxy. Many models of inflation produce enhanced power at these short distance scales and can thus be constrained by our observation. Further, many dark matter models such as axion dark matter, self-interacting dark matter and dissipative dark matter, produce dense structures which could be constrained this way.

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Substructure Physics Astrophysics Dark matter Stars Spectral density Spectrum (functional analysis) Astronomy Computer science Engineering Quantum mechanics Telecommunications Structural engineering

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2404.01378
PDF: https://arxiv.org/pdf/2404.01378
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Cited By: 1
Related Works: 10
OpenAlex ID: https://openalex.org/W4393924617

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DOI: https://doi.org/10.48550/arxiv.2404.01378

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Title: Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum

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Type: preprint

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Language: en

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Publication year: 2024

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Publication date: 2024-04-01

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Authors: Peter W. Graham, Harikrishnan Ramani

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Landing page: https://arxiv.org/abs/2404.01378

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PDF URL: https://arxiv.org/pdf/2404.01378

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Concepts: Substructure, Physics, Astrophysics, Dark matter, Stars, Spectral density, Spectrum (functional analysis), Astronomy, Computer science, Engineering, Quantum mechanics, Telecommunications, Structural engineering

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Cited by: 1

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