Clockwork/linear dilaton: structure and phenomenology

Giudice, Gian F.; Kats, Yevgeny; McCullough, Matthew; Torre, Riccardo; Urbano, Alfredo

doi:10.1007/jhep06(2018)009

Cited by 72 publications

(147 citation statements)

References 104 publications

(214 reference statements)

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“…while λ n is increasing in n. Therefore, in the limit N 1 the mass eigenvalues m n in (2.10) become approximately degenerate around the clockwork threshold scale M CW , and their mass gaps behave as δm ∼ M CW /N , which might have interesting phenomenological implications [27].…”

Section: Jhep07(2018)113mentioning

confidence: 98%

“…Then, depending upon which aspects of the discrete clockwork (DCW) one likes to reproduce, there can be two different approaches to the continuum clockwork (CCW) [5,26,27]: 1 one approach based on a specific form of 5D geometry involving an exponentially large volume together with an exponential warp factor [5], which can be obtained as a solution of the 5D linear dilaton model [28], and another approach based on exponentially localized zero mode profile over the 5th dimension in a field basis defined in terms of 5D U(1) or discrete gauge symmetry, which is generated by appropriately tuned bulk and boundary mass parameters [26]. As was briefly discussed in [5,26,29] and will be discussed in more detail in this paper, each approach has its own limitations, and as a result can reproduce only certain partial features of the original DCW axions and U(1) gauge bosons.…”

Section: Jhep07(2018)113mentioning

confidence: 99%

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General continuum clockwork

Choi

Im²,

Shin

2018

J. High Energ. Phys.

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Abstract:The continuum clockwork is an extra-dimensional set-up to realize certain features of the clockwork mechanism generating exponentially suppressed or hierarchical couplings of light particles. We study the continuum clockwork in a general scheme in which large volume, warped geometry, and localization of zero modes in extra dimension are described by independent parameters. For this, we propose a generalized 5-dimensional linear dilaton model which can realize such set-up as a solution of the model, and examine the KK spectrum and the couplings of zero modes and massive KK modes to boundarylocalized operators for the bulk graviton, Abelian gauge bosons and periodic scalar fields. We discuss how those KK spectra and couplings vary as a function of the volume, warping and localization parameters, and highlight the behavior in the parameter region corresponding to the clockwork limit. We discuss also the field range of 4-dimensional axions originating from either 5-dimensional periodic scalar field or the 5-th component of an Abelian gauge field, and comment on the limitations of continuum clockwork compared to the discrete clockwork.

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Section: Jhep07(2018)113mentioning

confidence: 98%

Section: Jhep07(2018)113mentioning

confidence: 99%

General continuum clockwork

Choi

Im²,

Shin

2018

J. High Energ. Phys.

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“…The clockwork theory then predicts an infinite tower of massive Kaluza-Klein (KK) gravitons, with a unique spectrum, that couple to SM particles in a specific way. Especially the low-lying states of clockwork KK gravitons exhibit rather interesting signatures at colliders, compared to other models of extra dimensions, as studied in detail [9]. In this paper we study the contributions of the clockwork gravitons to the anomalous magnetic moments of muon and constrain the parameters of the clockwork gravitons, which will be complementary to collider searches.…”

Section: Introductionmentioning

confidence: 96%

“…Giudice and McCullough then proposed a clockwork solution to the electroweak hierarchy problem [8], which exhibits rather rich structure and phenomenology [9]. The clockwork scenario addresses, similar to other extra dimensional scenarios, the hierarchy problem by assuming that the fundamental scale of the theory is not much higher than the electroweak scale.…”

Section: Introductionmentioning

confidence: 99%

Clockwork graviton contributions to muon g−2

2018

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The clockwork mechanism for gravity introduces a tower of massive graviton modes, clockwork gravitons, with a very compressed mass spectrum, whose interaction strengths are much stronger than those of massless gravitons. In this work, we compute the lowest order contributions of the clockwork gravitons to the anomalous magnetic moment, g − 2, of muon in the context of an extra dimensional model with a fivedimensional Planck mass, M 5 . We find that the total contributions are rather insensitive to the detailed model parameters and are determined mostly by the value of M 5 . To account for the current muon g − 2 anomaly, M 5 should be around 0.2 TeV, and the size of the extra dimension has to be quite large, l 5 ≳ 10 −7 m. For M 5 ≳ 1 TeV, the clockwork graviton contributions are too small to explain the current muon g − 2 anomaly. We also compare the clockwork graviton contributions with other extra dimensional models such as Randall-Sundrum models or large extra dimensional models. We find that the leading contributions in the small curvature limit are universal, but the cutoff-independent subleading contributions vary for different background geometries and the clockwork geometry gives the smallest subleading contributions.

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“…[17] and its phenomenology at the LHC has been studied in Ref. [18]. In this scenario, a KK-graviton tower with spacing very similar to that of LED models starts at a mass gap k with respect to the zero-mode graviton.…”

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confidence: 99%

Gravity-mediated dark matter in clockwork/linear dilaton extra-dimensions

Folgado

Donini

Rius

2020

J. High Energ. Phys.

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We study for the first time the possibility that Dark Matter (represented by particles with spin 0, 1/2 or 1) interacts gravitationally with Standard Model particles in an extra-dimensional Clockwork/Linear Dilaton model. We assume that both, the Dark Matter and the Standard Model, are localized in the IR-brane and only interact via gravitational mediators, namely the Kaluza-Klein (KK) graviton and the radion/KK-dilaton modes. We analyse in detail the Dark Matter annihilation channel into Standard Model particles and into two on-shell Kaluza-Klein towers (either two KK-gravitons, or two radion/KK-dilatons, or one of each), finding that it is possible to obtain the observed relic abundance via thermal freeze-out for Dark Matter masses in the range m DM ∈ [1, 15] TeV for a 5-dimensional gravitational scale M 5 ranging from 5 to a few hundreds of TeV, even after taking into account the bounds from LHC Run II and irrespectively of the DM particle spin.

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Clockwork/linear dilaton: structure and phenomenology

Cited by 72 publications

References 104 publications

General continuum clockwork

General continuum clockwork

Clockwork graviton contributions to muon g−2

Gravity-mediated dark matter in clockwork/linear dilaton extra-dimensions

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