Bound states of pseudo-Dirac dark matter

Bhattacharya, Arindam; Slatyer, Tracy R.

doi:10.1088/1475-7516/2019/03/029

Cited by 8 publications

(7 citation statements)

References 59 publications

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“…In the refs. [72,[92][93][94], compared with our paper, the longitudinal contribution to the off-diagonal element of the potential matrix which is proportional to c 1 in our (3.25) is absent. This is a good approximation if δm m γ .…”

Section: Comparison With Other Similar Situations In the Literaturementioning

confidence: 54%

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Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

Matsui²,

Tang³

2020

J. High Energ. Phys.

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If fermionic dark matter (DM) is stabilized by dark U(1) gauge symmetry that is spontaneously broken into its subgroup Z2, the particle contents of the model becomes very rich: DM and excited DM, both of them are Majorana fermions, as well as two dark force mediators, dark photon and dark Higgs boson are naturally present due to the underlying dark gauge symmetry. In this paper, we study the DM bound state formation processes within this scenario, assuming both dark photon and dark Higgs are light mediators and including the effects of excited DM. The Goldstone boson contributions to the potential matrix in the Schrödinger equations are found to be important. The emissions of a longitudinal vector boson (or somehow equivalently a Goldstone boson) during the DM bound state formations are crucial to induce a significant reannihilation process, reducing the dark matter relic abundance. Most of the stringent constraints for this kind of dark matter considered in the literature are simply evaded.

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Section: Comparison With Other Similar Situations In the Literaturementioning

confidence: 54%

“…This term can be neglected in the ref. [72], once the mass difference of the dark matter is much smaller than the dark photon mass.…”

Section: Comparison With Other Similar Situations In the Literaturementioning

confidence: 98%

Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

Matsui²,

Tang³

2020

J. High Energ. Phys.

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show abstract

“…In the Ref. [72,[89][90][91], compared with our paper, the longitudinal contribution to the off-diagonal element of the potential matrix which is proportional to c 1 in our (3.22) is absent. This is a good approximation if δm m γ .…”

Section: Comparison With Other Similar Situations In the Literaturecontrasting

confidence: 43%

Dark Matter Bound State Formation in Fermionic $Z_2$ DM model with Light Dark Photon and Dark Higgs Boson

Ko,

Matsui,

Tang

2019

Preprint

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If fermionic dark matter (DM) is stabilized by dark U (1) gauge symmetry that is spontaneously broken into its subgroup Z 2 , the particle contents of the model becomes very rich: DM and excited DM, both of them are Majorana fermions, as well as two dark force mediators, dark photon and dark Higgs boson are naturally present due to the underlying dark gauge symmetry. In this paper, we study the DM bound state formation processes within this scenario, assuming both dark photon and dark Higgs are light mediators and including the effects of excited DM. The Goldstone boson contributions to the potential matrix in the Schrödinger equations are found to be important. The emissions of a longitudinal vector boson (or somehow equivalently a Goldstone boson) during the DM bound state formations are crucial to induce a significant reannihilation process, reducing the dark matter relic abundance. Most of the stringent constraints for this kind of dark matter considered in the literature are simply evaded.

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“…Finally, it is interesting to consider whether or not the decay products include Standard Model particles. Particle collider experiments have been used to constrain dark matter decays that operate via Standard Model portals and scattering mechanisms, including the Higgs portal (e.g., ATLAS Collaboration 2021) or a more general coupling in the case of pseudo-Dirac dark mater (e.g., Jordan et al 2018;Bhattacharya & Slatyer 2019;González & Toro 2021). Similarly, gamma-ray and X-ray telescopes constrain WIMP-like models that decay into Standard Model particles (e.g., Ackermann et al 2015;Gaskins 2016;Ando et al 2021).…”

Section: Decaying Dark Matter Phenomenologymentioning

confidence: 99%

Milky Way Satellite Census. IV. Constraints on Decaying Dark Matter from Observations of Milky Way Satellite Galaxies

Mau

Nadler

Drlica-Wagner

et al. 2022

ApJ

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We use a recent census of the Milky Way (MW) satellite galaxy population to constrain the lifetime of particle dark matter (DM). We consider two-body decaying dark matter (DDM) in which a heavy DM particle decays with lifetime τ comparable to the age of the universe to a lighter DM particle (with mass splitting ϵ) and to a dark radiation species. These decays impart a characteristic “kick velocity,” V kick = ϵ c, on the DM daughter particles, significantly depleting the DM content of low-mass subhalos and making them more susceptible to tidal disruption. We fit the suppression of the present-day DDM subhalo mass function (SHMF) as a function of τ and V kick using a suite of high-resolution zoom-in simulations of MW-mass halos, and we validate this model on new DDM simulations of systems specifically chosen to resemble the MW. We implement our DDM SHMF predictions in a forward model that incorporates inhomogeneities in the spatial distribution and detectability of MW satellites and uncertainties in the mapping between galaxies and DM halos, the properties of the MW system, and the disruption of subhalos by the MW disk using an empirical model for the galaxy–halo connection. By comparing to the observed MW satellite population, we conservatively exclude DDM models with τ < 18 Gyr (29 Gyr) for V kick = 20 kms−1 (40 kms−1) at 95% confidence. These constraints are among the most stringent and robust small-scale structure limits on the DM particle lifetime and strongly disfavor DDM models that have been proposed to alleviate the Hubble and S 8 tensions.

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Bound states of pseudo-Dirac dark matter

Cited by 8 publications

References 59 publications

Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

Dark Matter Bound State Formation in Fermionic $Z_2$ DM model with Light Dark Photon and Dark Higgs Boson

Milky Way Satellite Census. IV. Constraints on Decaying Dark Matter from Observations of Milky Way Satellite Galaxies

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