Solving the Hierarchy Problem at Reheating with a Large Number of Degrees of Freedom

Arkani-Hamed, Nima; Cohen, Timothy; D’Agnolo, Raffaele Tito; Hook, Anson; Kim, Hyung Do; Pinner, David

doi:10.1103/physrevlett.117.251801

Cited by 160 publications

(237 citation statements)

References 20 publications

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“…In this respect, the scenario is philosophically similar to N naturalness [39], albeit with a parsimonious N = 2 sectors. See also [40,41] and [24] for other recent related ideas of using long-lived particles for the dilution of dark sectors.…”

Section: Jhep05(2017)038mentioning

confidence: 94%

Cosmological signals of a mirror twin Higgs

Craig

Koren

Trott

2017

J. High Energ. Phys.

138

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Abstract:We investigate the cosmology of the minimal model of neutral naturalness, the mirror Twin Higgs. The softly-broken mirror symmetry relating the Standard Model to its twin counterpart leads to significant dark radiation in tension with BBN and CMB observations. We quantify this tension and illustrate how it can be mitigated in several simple scenarios that alter the relative energy densities of the two sectors while respecting the softly-broken mirror symmetry. In particular, we consider both the out-of-equilibrium decay of a new scalar as well as reheating in a toy model of twinned inflation, Twinflation. In both cases the dilution of energy density in the twin sector does not merely reconcile the existence of a mirror Twin Higgs with cosmological constraints, but predicts contributions to cosmological observables that may be probed in current and future CMB experiments. This raises the prospect of discovering evidence of neutral naturalness through cosmology rather than colliders.

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Section: Jhep05(2017)038mentioning

confidence: 94%

Cosmological signals of a mirror twin Higgs

Craig

Koren

Trott

2017

J. High Energ. Phys.

138

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“…As mentioned, the core idea of Nnaturalness is to consider a theory containing N copies of the visible sector with varying Higgs mass squared parameters. For simplicity we follow [19] and assume that these are otherwise identical, however in general the other parameters of the sectors, or even their field content or gauge groups, could also change without destroying the mechanism. The distribution of the Higgs mass squared parameters in the different sectors is taken to be flat up to a cutoff Λ 2 .…”

Section: Jhep11(2017)125 3 Nnaturalness and Non-oscillatory Potentialsmentioning

confidence: 99%

“…An alternative proposal, Nnaturalness [19], is that there may be a large number N of sectors, all resembling the SM but with different Higgs mass squared parameters. Among these there will typically be sectors that happen to have a Higgs with a mass far below the UV cutoff, but which are otherwise undistinguished.…”

Section: Jhep11(2017)125mentioning

confidence: 99%

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Non-perturbative reheating and Nnaturalness

Hardy¹

2017

J. High Energ. Phys.

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We study models in which reheating happens only through non-perturbative processes. The energy transferred can be exponentially suppressed unless the inflaton is coupled to a particle with a parametrically small mass. Additionally, in some models a light scalar with a negative mass squared parameter leads to much more efficient reheating than one with a positive mass squared of the same magnitude. If a theory contains many sectors similar to the Standard Model coupled to the inflaton via their Higgses, such dynamics can realise the Nnaturalness solution to the hierarchy problem. A sector containing a light Higgs with a non-zero vacuum expectation value is dominantly reheated and there is little energy transferred to the other sectors, consistent with cosmological constraints. The inflaton must decouple from other particles and have a flat potential at large field values, in which case the visible sector UV cutoff can be raised to 10 TeV in a simple model.

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“…Such a scenario can be motivated by mirror models [52][53][54] or models of neutral naturalness [55][56][57][58][59][60][61][62].…”

Section: B Mirror Qcdmentioning

confidence: 99%

Dark spectroscopy at lepton colliders

2018

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Rich and complex dark sectors are abundant in particle physics theories. Here, we propose performing spectroscopy of the mass structure of dark sectors via mono-photon searches at lepton colliders. The energy of the mono-photon tracks the invariant mass of the invisible system it recoils against, which enables studying the resonance structure of the dark sector. We demonstrate this idea with several well-motivated models of dark sectors. Such spectroscopy measurements could potentially be performed at Belle II, BES-III and future low-energy lepton colliders.

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Solving the Hierarchy Problem at Reheating with a Large Number of Degrees of Freedom

Cited by 160 publications

References 20 publications

Cosmological signals of a mirror twin Higgs

Cosmological signals of a mirror twin Higgs

Non-perturbative reheating and Nnaturalness

Dark spectroscopy at lepton colliders

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