Determining Dark-Matter–Electron Scattering Rates from the Dielectric Function

Hochberg, Yonit; Kahn, Yonatan; Kurinsky, Noah; Lehmann, Benjamin V.; Yu, To Chin; Berggren, Karl K.

doi:10.1103/physrevlett.127.151802

Cited by 74 publications

(61 citation statements)

References 91 publications

(154 reference statements)

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“…According to Ref. [50], the lower limit of the DM-e − scattering cross section can reach σ e 8.4 × 10 −41 cm 2 for m X,N ∼ 20 MeV, and m Z ∼ 250 MeV. It can be transferred to g…”

Section: Discussionmentioning

confidence: 95%

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Scalar and Fermion Two-component SIMP Dark Matter with an Accidental $\mathbb{Z}^{}_4$ Symmetry

Ho,

Ko,

2022

Preprint

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In this paper, we construct for the first time a two-component strongly interacting massive particles (SIMP) dark matter (DM) model, where a complex scalar and a vector-like fermion play the role of the SIMP DM candidates. These two particles are stable due to an accidental Z 4 symmetry after the breaking of a U(1) D gauge symmetry. By introducing one extra complex scalar as a mediator between the SIMP particles, this model can have 3 → 2 processes that determine the DM relic density. On the other hand, the SIMP DM particles can maintain kinetic equilibrium with the thermal bath until the DM freeze-out temperature via the U(1) D gauge couplings. Most importantly, we find an unavoidable two-loop induced 2 → 2 process tightly connecting to the 3 → 2 process that would redistribute the SIMP DM number densities after the chemical freeze-out of DM. Moreover, this redistribution would significantly modify the predictions of the self-interacting cross section of DM compared with other SIMP models. It is crucial to include the two-loop induced 2 → 2 annihilations to obtain the correct DM phenomenology.

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“…According to Ref. [50], the lower limit of the DM-e − scattering cross section can reach σ e 8.4 × 10 −41 cm 2 for m X,N ∼ 20 MeV, and m Z ∼ 250 MeV. It can be transferred to g…”

Section: Discussionmentioning

confidence: 95%

“…We discuss some future investigations for the rSIMP model. Since the DM masses are about 20 MeV, the DM-e − scattering experiments can be used to test the allowed parameter space in this model [50][51][52][53]. According to Ref.…”

Section: Discussionmentioning

confidence: 99%

Scalar and Fermion Two-component SIMP Dark Matter with an Accidental $\mathbb{Z}^{}_4$ Symmetry

Ho,

Ko,

2022

Preprint

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“…Left: SI model with a light mediator (F med = (q0/q) 2 ), screened with the static dielectric shown in Fig 6 . The red solid (dashed) curve shows the constraints with (without) the inclusion of SOC effects. For comparison we also show projected constraints from single phonon excitations in GaAs (orange) and SiO2 (purple) computed with PhonoDark [56] (assuming an energy threshold of ωmin = 20 meV), electronic excitations in an aluminum superconductor [57] (brown), and previous estimates for ZrTe5 (teal) [25]. We also show the projected constraints combining the SOC energy levels with the No SOC wave functions, ("Partial SOC", red, dashed) to explicitly show the effect of the spin dependent wave functions.…”

Section: B Scatteringmentioning

confidence: 99%

Dark Matter Direct Detection in Materials with Spin-Orbit Coupling

Chen,

Mitridate,

Trickle

et al. 2022

Preprint

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Semiconductors with O(meV) band gaps have been shown to be promising targets to search for sub-MeV mass dark matter (DM). In this paper we focus on a class of materials where such narrow band gaps arise naturally as a consequence of spin-orbit coupling (SOC). Specifically, we are interested in computing DM-electron scattering and absorption rates in these materials using stateof-the-art density functional theory (DFT) techniques. To do this, we extend the DM interaction rate calculation to include SOC effects which necessitates a generalization to spin-dependent wave functions. We apply our new formalism to calculate limits for several DM benchmark models using an example ZrTe5 target and show that the inclusion of SOC can substantially alter projected constraints. CONTENTS 8 1. Density Functional Theory (DFT) 8 2. DM Interaction Constraint Convergence and Dielectric Function 9 B. Generalized Self-Energies 10 C. Analytic Approximations in Dirac Materials 13 References 15

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“…phonons or plasmons), and others. These types of effects have been studied recently in the context of laboratory experiments searching for the scattering of sub-GeV DM [31][32][33][34], but have mostly been ignored in existing treatments of DM scattering in stars. In this paper, we consider such effects systematically, and show that they can make parametrically large differences to DM capture rates.…”

Section: Introductionmentioning

confidence: 99%

Dark matter scattering in astrophysical media: collective effects

DeRocco,

Galanis,

Lasenby

2022

Preprint

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It is well-known that stars have the potential to be excellent dark matter detectors. Infalling dark matter that scatters within stars could lead to a range of observational signatures, including stellar heating, black hole formation, and modified heat transport. To make robust predictions for such phenomena, it is necessary to calculate the scattering rate for dark matter inside the star. As we show in this paper, for small enough momentum transfers, this requires taking into account collective effects within the dense stellar medium. These effects have been neglected in many previous treatments; we demonstrate how to incorporate them systematically, and show that they can parametrically enhance or suppress dark matter scattering rates depending on how dark matter couples to the Standard Model. We show that, as a result, collective effects can significantly modify the potential discovery or exclusion reach for observations of compact objects such as white dwarfs and neutron stars. While the effects are more pronounced for dark matter coupling through a light mediator, we show that even for dark matter coupling via a heavy mediator, scattering rates can differ by orders of magnitude from their naive values for dark matter masses 100 MeV. We also illustrate how collective effects can be important for dark matter scattering in more dilute media, such as the Solar core. Our results demonstrate the need to systematically incorporate collective effects in a wide range of astroparticle contexts; to facilitate this, we provide expressions for in-medium self-energies for a variety of different media, which are applicable to many other processes of interest (such as particle production).

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Determining Dark-Matter–Electron Scattering Rates from the Dielectric Function

Cited by 74 publications

References 91 publications

Scalar and Fermion Two-component SIMP Dark Matter with an Accidental $\mathbb{Z}^{}_4$ Symmetry

Scalar and Fermion Two-component SIMP Dark Matter with an Accidental $\mathbb{Z}^{}_4$ Symmetry

Dark Matter Direct Detection in Materials with Spin-Orbit Coupling

Dark matter scattering in astrophysical media: collective effects

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