Strategies for probing nonminimal dark sectors at colliders: The interplay between cuts and kinematic distributions

Su, Shufang; Thomas, Brooks

doi:10.1103/physrevd.91.054002

Cited by 29 publications

(22 citation statements)

References 79 publications

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“…Dark-matter ensembles with these properties emerge naturally in a variety of contexts [23,24,[49][50][51][52], and detection strategies for such ensembles are discussed in Refs. [53][54][55][56][57][58][59]. Indeed, it has been shown that the KK modes associated with a bulk axionlike field which receives its abundance via misalignment production constitute a viable DDM ensemble [24,25], The results we have obtained here are thus directly applicable to DDM ensembles of this sort and lead to a suppression of the overall relic abundance of the ensemble for large δ G relative to the relic abundance which arises for the abrupt case considered in Refs.…”

Section: Discussionmentioning

confidence: 58%

Kaluza-Klein towers in the early universe: Phase transitions, relic abundances, and applications to axion cosmology

Kost¹,

Thomas²

2017

Phys. Rev. D

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We study the early-universe cosmology of a Kaluza-Klein (KK) tower of scalar fields in the presence of a mass-generating phase transition, focusing on the time-development of the total tower energy density (or relic abundance) as well as its distribution across the different KK modes. We find that both of these features are extremely sensitive to the details of the phase transition and can behave in a variety of ways significant for late-time cosmology. In particular, we find that the interplay between the temporal properties of the phase transition and the mixing it generates are responsible for both enhancements and suppressions in the late-time abundances, sometimes by many orders of magnitude. We map out the complete model parameter space and determine where traditional analytical approximations are valid and where they fail. In the latter cases we also provide new analytical approximations which successfully model our results. Finally, we apply this machinery to the example of an axion-like field in the bulk, mapping these phenomena over an enlarged axion parameter space that extends beyond those accessible to standard treatments. An important byproduct of our analysis is the development of an alternate "UV-based" effective truncation of KK theories which has a number of interesting theoretical properties that distinguish it from the more traditional "IR-based" truncation typically used in the extra-dimension literature.

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Section: Discussionmentioning

confidence: 58%

Kaluza-Klein towers in the early universe: Phase transitions, relic abundances, and applications to axion cosmology

Kost¹,

Thomas²

2017

Phys. Rev. D

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“…There are many studies on the multi-component DM scenarios, see [3,[25][26][27][28][29][30][31][32][33][34][35], as well as the dynamical DM scenario [36,37] whose phenomenological consequences are often quite distinct and can be applied to a much broader variety of multi-component DM scenarios [38][39][40][41]. The primary purpose of this work is to explain the CDM relic density, where the two different DM components interact with each other besides with the three Higgses, thus affects the evolution of the DM components number densities through the coupled Boltzman equations [3,42].…”

Section: Jhep03(2015)126mentioning

confidence: 99%

Two component dark matter with multi-Higgs portals

Bian

Shu

et al. 2015

J. High Energ. Phys.

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Abstract:With the assistance of two extra groups, i.e., an extra hidden gauge group SU(2) D and a global U(1) group, we propose a two component dark matter (DM) model. After the symmetry SU(2) D × U(1) being broken, we obtain both the vector and scalar DM candidates. The two DM candidates communicate with the standard model (SM) via three Higgs as multi-Higgs portals. The three Higgs are mixing states of the SM Higgs, the Higgs of the hidden sector and real part of a supplement complex scalar singlet. We study relic density and direct detection of DM in three scenarios. The resonance behaviors and interplay between the two component DM candidates are represented through investigating of the relic density in the parameter spaces of the two DMs masses. The electroweak precision parameters constrains the two Higgs portals couplings (λ m and δ 2 ). The relevant vacuum stability and naturalness problem in the parameter space of λ m and δ 2 are studied as well. The model could alleviate these two problems in some parameter spaces under the constraints of electroweak precision observables and Higgs indirect search.

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“…As such, DDM furnishes what may be considered to be the most general example of a non-minimal dark sector, and even reduces to (and thereby incorporates) the simple case of a single hyperstable dark-matter particle as the number of individual states within the DDM ensemble is taken to one. However, as the number of dark-sector states becomes larger, these ensembles give rise to rich collider-based, astrophysical, and cosmological phenomenologies [3][4][5][6][7][8][9] which generalize and even transcend what is possible with a single dark-matter particle alone.…”

Section: Introductionmentioning

confidence: 99%

Randomness in the dark sector: Emergent mass spectra and Dynamical Dark Matter ensembles

2016

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In general, non-minimal models of the dark sector such as Dynamical Dark Matter posit the existence of an ensemble of individual dark components with differing masses, cosmological abundances, and couplings to the Standard Model. Perhaps the most critical among these features is the spectrum of masses, as this goes a long way towards determining the cosmological abundances and lifetimes of the corresponding states. Many different underlying theoretical structures can be imagined for the dark sector, each giving rise to its own mass spectrum and corresponding density of states. In this paper, by contrast, we investigate the spectrum of masses that emerges statistically from underlying processes which are essentially random. We find a density of states n(m) which decreases as a function of mass and actually has an upper limit mmax beyond which n(m) = 0. We also demonstrate that this "emergent" density of states is particularly auspicious from the perspective of the Dynamical Dark Matter framework, leading to cosmological abundances and decay widths that are suitably balanced against each other across the dark-matter ensemble. Thus randomness in the dark sector coexists quite naturally with Dynamical Dark Matter, and we examine the prospects for observing the signals of such scenarios in dark-matter indirect-detection experiments.

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Strategies for probing nonminimal dark sectors at colliders: The interplay between cuts and kinematic distributions

Cited by 29 publications

References 79 publications

Kaluza-Klein towers in the early universe: Phase transitions, relic abundances, and applications to axion cosmology

Kaluza-Klein towers in the early universe: Phase transitions, relic abundances, and applications to axion cosmology

Two component dark matter with multi-Higgs portals

Randomness in the dark sector: Emergent mass spectra and Dynamical Dark Matter ensembles

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