A simple determination of the halo size from<sup>10</sup>Be/<sup>9</sup>Be data

Maurin, D.; Bueno, E. F.; Derome, L.

doi:10.1051/0004-6361/202243546

Cited by 15 publications

(4 citation statements)

References 71 publications

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“…From these variations, we observe that the predicted e ± DM signals are significantly more affected by changes in the halo height, producing variations of up to a factor of a few. This parameter regulates the volume of propagation of charged particles in the Galaxy and constitutes one of the main uncertainties in current CR studies (Ginzburg et al 1980;Evoli et al 2020;Maurin et al 2022). Additionally, from Figure 1, we see that reacceleration promotes low-energy electrons to energies well above the mass of the DM particle producing them (left panel).…”

Section: Galactic Electron-positron Flux Induced By Dmmentioning

confidence: 92%

Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints

De la Torre Luque,

Balaji,

Koechler

2024

ApJ

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We study sub-GeV dark matter (DM) particles that may annihilate or decay into Standard Model particles producing an exotic injection component in the Milky Way that leaves an imprint in both photon and cosmic-ray (CR) fluxes. Specifically, the DM particles may annihilate or decay into e + e −, μ + μ −, or π + π − and may radiate photons through their e ± products. The resulting e ± products can be directly observed in probes such as Voyager 1. Alternatively, the e ± products may produce bremsstrahlung radiation and upscatter the low-energy Galactic photon fields via the inverse Compton process, generating a broad emission from X-ray to γ-ray energies observable in experiments such as XMM-Newton. We find that we get a significant improvement in the DM annihilation and decay constraints from XMM-Newton (excluding thermally averaged cross sections of 10−31 cm3 s−1 ≲ 〈σ v〉 ≲ 10−26 cm3 s−1 and decay lifetimes of 1026 s ≲ τ ≲ 1028 s, respectively) by including best-fit CR propagation and diffusion parameters. This yields the strongest astrophysical constraints for this mass range of DM of 1 MeV to a few GeV and even surpasses cosmological bounds across a wide range of masses as well.

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Section: Galactic Electron-positron Flux Induced By Dmmentioning

confidence: 92%

Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints

De la Torre Luque,

Balaji,

Koechler

2024

ApJ

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“…The degeneracy between h D and D can in principle be broken by data on "cosmic clocks" (e.g., 10 Be/ 9 Be or Be/C), but due to the poor quality of the current data and uncertainties in the spallation cross sections, only mild constraints on the halo height can be derived, and the current estimates of h D are in the range 2-10 kpc (e.g., Evoli et al 2020;Weinrich et al 2020;Maurin et al 2022). We therefore consider diffusion volumes having h D = 2, 4, 6, 8, and 10 kpc and derive the corresponding n cre for each to allow us to assess the uncertainty in the GMF due to the present uncertainty in h D .…”

Section: Cosmic-ray Electronsmentioning

confidence: 99%

The Coherent Magnetic Field of the Milky Way

Unger,

Farrar

2024

ApJ

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We present a suite of models of the coherent magnetic field of the Galaxy based on new divergence-free parametric functions describing the global structure of the field. The model parameters are fit to the latest full-sky Faraday rotation measures (RMs) of extragalactic sources and polarized synchrotron intensity (PI) maps from the Wilkinson Microwave Anisotropy Probe and Planck. We employ multiple models for the density of thermal and cosmic-ray electrons in the Galaxy, needed to predict the sky maps of RMs and PI for a given Galactic magnetic field (GMF) model. The robustness of the inferred properties of the GMF is gauged by studying many combinations of parametric field models and electron density models. We determine the pitch angle of the local magnetic field (11°± 1°), explore the evidence for a grand-design spiral coherent magnetic field (inconclusive), determine the strength of the toroidal and poloidal magnetic halo fields below and above the disk (magnitudes the same for both hemispheres within ≈10%), set constraints on the half-height of the cosmic-ray diffusion volume (2.9 kpc), investigate the compatibility of RM-and PI-derived magnetic field strengths (compatible under certain assumptions), and check if the toroidal halo field could be created by the shear of the poloidal halo field due to the differential rotation of the Galaxy (possibly). A set of eight models is identified to help quantify the present uncertainties in the coherent GMF spanning different functional forms, data products, and auxiliary input. We present the corresponding sky maps of rates for axion-photon conversion in the Galaxy and deflections of ultrahigh-energy cosmic rays.Unified Astronomy Thesaurus concepts: Milky Way magnetic fields (1057); Galaxy magnetic fields (604); Milky Way Galaxy physics (1056); Cosmic rays (329); Cosmic ray astronomy (324)

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“…For both setups, we fix the half-height of the diffusion halo to 4 kpc, which is roughly the lower bound compatible with the beryllium data from AMS-02 [24,96,[107][108][109]. This is different with respect to the propagation setup used in our previous work [28], in which z h was varied as free parameter.…”

Section: Jcap08(2023)052mentioning

confidence: 99%

Fast and accurate AMS-02 antiproton likelihoods for global dark matter fits

Balan,

Kahlhoefer,

Korsmeier

et al. 2023

J. Cosmol. Astropart. Phys.

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The antiproton flux measurements from AMS-02 offer valuable information about the nature of dark matter, but their interpretation is complicated by large uncertainties in the modeling of cosmic ray propagation. In this work we present a novel framework to efficiently marginalise over propagation uncertainties in order to obtain robust AMS-02 likelihoods for arbitrary dark matter models. The three central ingredients of this framework are: the neural emulator , which provides highly flexible predictions of the antiproton flux; the likelihood calculator , which performs the marginalisation, taking into account the effects of solar modulation and correlations in AMS-02 data; and the global fitting framework , which allows for the combination of the resulting likelihood with a wide range of dark matter observables. We illustrate our approach by providing updated constraints on the annihilation cross section of WIMP dark matter into bottom quarks and by performing a state-of-the-art global fit of the scalar singlet dark matter model, including also recent results from direct detection and the LHC.

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A simple determination of the halo size from¹⁰Be/⁹Be data

Cited by 15 publications

References 71 publications

Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints

Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints

The Coherent Magnetic Field of the Milky Way

Fast and accurate AMS-02 antiproton likelihoods for global dark matter fits

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A simple determination of the halo size from10Be/9Be data

Cited by 15 publications

References 71 publications

Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints

Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints

The Coherent Magnetic Field of the Milky Way

Fast and accurate AMS-02 antiproton likelihoods for global dark matter fits

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Product

Resources

About

A simple determination of the halo size from¹⁰Be/⁹Be data