Freezing-in twin dark matter

Koren, Seth; McGehee, Robert

doi:10.1103/physrevd.101.055024

Cited by 66 publications

(44 citation statements)

References 77 publications

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“…This suggests trying to realize the suppression of by devising a multi-loop generation mechanism. A known example is the mirror-symmetric twin Higgs model, where kinetic mixing is at least four-loop-suppressed, leading to ∼ 10 −13 −10 −10 [51,52].…”

Section: Gauge-mediated Kinetic Mixingmentioning

confidence: 99%

Evaluating the price of tiny kinetic mixing

Gherghetta¹,

Kersten²,

Olive³

et al. 2019

Phys. Rev. D

102

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We consider both "bottom-up" and "top-down" approaches to the origin of gauge kinetic mixing. We focus on the possibilities for obtaining kinetic mixings which are consistent with experimental constraints and are much smaller than the naive estimates ( ∼ 10 −2 − 10 −1 ) at the one-loop level. In the bottom-up approach, we consider the possible suppression from multi-loop processes. Indeed we argue that kinetic mixing through gravity alone, requires at least six loops and could be as large as ∼ 10 −13 . In the top-down approach we consider embedding the Standard Model and a U (1) X in a single grand-unified gauge group as well as the mixing between Abelian and non-Abelian gauge sectors. *

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Section: Gauge-mediated Kinetic Mixingmentioning

confidence: 99%

Evaluating the price of tiny kinetic mixing

Gherghetta¹,

Kersten²,

Olive³

et al. 2019

Phys. Rev. D

102

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“…One could also make the twin neutrinos heavy [35,36] and even the twin photon heavy without affecting naturalness [37,38], while expanding the possibilities for twin dark matter candidates [39,40]. Asymmetric entropy production after the twin and SM sectors decouple is another way to diminish N eff [30,36,[41][42][43]. Its effects on the matter power spectrum could also be seen by future large scale structure observations [44].…”

Section: Jhep05(2020)155mentioning

confidence: 99%

A predictive mirror twin Higgs with small Z2 breaking

Harigaya

McGehee

Murayama

et al. 2020

J. High Energ. Phys.

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The twin Higgs mechanism is a solution to the little hierarchy problem in which the top partner is neutral under the Standard Model (SM) gauge group. The simplest mirror twin Higgs (MTH) model-where a Z 2 symmetry copies each SM particle-has too many relativistic degrees of freedom to be consistent with cosmological observations. We demonstrate that MTH models can have an observationally viable cosmology if the twin mass spectrum leads to twin neutrino decoupling before the SM and twin QCD phase transitions. Our solution requires the twin photon to have a mass of ∼ 20 MeV and kinetically mix with the SM photon to mediate entropy transfer from the twin sector to the SM. This twin photon can be robustly discovered or excluded by future experiments. Additionally, the residual twin degrees of freedom present in the early Universe in this scenario would be detectable by future observations of the cosmic microwave background.

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“…First, the presence of a mirror photon and mirror neutrinos leads to too many effective relativistic degrees of freedom, which is severely constrained by both the Cosmic Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN) [10,11]. This problem is not the focus of this paper, but we do mention that several solutions were already proposed and involve cooling down the mirror sector before the onset of BBN [12][13][14][15][16]. Second, the Z 2 symmetry only being broken softly would almost unavoidably lead to dark matter having a similar composition to normal matter, i.e.…”

Section: Introductionmentioning

confidence: 99%

Mirror neutrons as dark matter in the Mirror Twin Two Higgs Doublet Model

Beauchesne

2020

J. High Energ. Phys.

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In addition to being a solution to the little hierarchy problem, the Mirror Twin Higgs provides a natural setting for Asymmetric Dark Matter. In its incarnation with only one Higgs doublet and its mirror copy, dark matter would however almost certainly consist mostly of mirror atoms, which is severely ruled out by constraints on dark matter self-interactions. By adding a second Higgs doublet and its mirror, the vevs of the different Higgses can be arranged such that dark matter consists mostly of mirror neutrons, which is cosmologically viable. In this paper, it is shown that current constraints from colliders, flavour and cosmology can accommodate such a vev structure with little increase in the necessary tuning.

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Freezing-in twin dark matter

Cited by 66 publications

References 77 publications

Evaluating the price of tiny kinetic mixing

Evaluating the price of tiny kinetic mixing

A predictive mirror twin Higgs with small Z2 breaking

Mirror neutrons as dark matter in the Mirror Twin Two Higgs Doublet Model

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