Higgs-dilaton cosmology: From the early to the late Universe

García-Bellido, J.; Rubio, Javier; Shaposhnikov, Mikhail; Zenhäusern, Daniel

doi:10.1103/physrevd.84.123504

Cited by 241 publications

(418 citation statements)

References 98 publications

(250 reference statements)

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“…For example, in [23][24][25][26][27][28][29] the traditional dilaton models were compared with models including Higgs boson, and the techni-dilaton was shown to be able to explain the signals well [30][31][32][33][34][35]. The Higgs-dilaton was also used to solve cosmological problems such as inflation and dark energy [36][37][38][39][40].…”

Section: Jhep01(2014)150mentioning

confidence: 99%

Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

Cao

et al. 2014

J. High Energ. Phys.

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The Minimal Dilaton Model (MDM) extends the Standard Model (SM) by a singlet scalar, which can be viewed as a linear realization of general dilaton field. This new scalar field mixes with the SM Higgs field to form two mass eigenstates with one of them corresponding to the 125 GeV SM-like Higgs boson reported by the LHC experiments. In this work, under various theoretical and experimental constrains, we perform fits to the latest Higgs data and then investigate the phenomenology of Higgs boson in both the heavy dilaton scenario and the light dilaton scenario of the MDM. We find that: (i) if one considers the ATLAS and CMS data separately, the MDM can explain each of them well, but refer to different parameter space due to the apparent difference in the two sets of data. If one considers the combined data of the LHC and Tevatron, however, the explanation given by the MDM is not much better than the SM, and the dilaton component in the 125-GeV Higgs is less than about 20% at 2σ level.(ii) The current Higgs data have stronger constrains on the light dilaton scenario than on the heavy dilaton scenario. (iii) The heavy dilaton scenario can produce a Higgs triple self coupling much larger than the SM value, and thus a significantly enhanced Higgs pair cross section at hadron colliders. With a luminosity of 100 fb −1 (10 fb −1 ) at the 14-TeV LHC, a heavy dilaton of 400 GeV (500 GeV) can be examined. (iv) In the light dilaton scenario, the Higgs exotic branching ratio can reach 43% (60%) at 2σ (3σ) level when considering only the CMS data, which may be detected at the 14-TeV LHC with a luminosity of 300 fb −1 and the Higgs Factory.

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Section: Jhep01(2014)150mentioning

confidence: 99%

Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

Cao

et al. 2014

J. High Energ. Phys.

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“…This potential also appears when inflation is driven by the Higgs field nonminimally coupled to gravity [42,43], which is naturally the case in curved space-time as produced by quantum fluctuations [44]. This is why in the following we refer to it as the "Higgs inflation" model.…”

Section: A Horizon-flow Trajectories In Typical Examplesmentioning

confidence: 99%

Horizon-flow off-track for inflation

Vennin¹

2014

Phys. Rev. D

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Inflation can be parametrized by means of truncated flow equations. In this "horizon-flow" setup, generic results have been obtained, such as typical values for r/ (1 − nS). They are sometimes referred to as intrinsic features of inflation itself. In this paper we first show that the phenomenological class of inflationary potentials sampled by horizon flow is directly responsible for such predictions. They are therefore anything but generic. Furthermore, the horizon-flow setup is shown to rely on trajectories in phase space that differ from the slow roll. For a given potential, we demonstrate that this renders horizon flow blind to entire relevant inflationary regimes, for which the horizon-flow trajectory is shown to be unstable. This makes horizon flow a biased parametrization of inflation.

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“…An intriguing possibility is so-called Higgs inflation [71,72] which uses the SM Higgs as the inflaton equipped with a large non-minimal gravitational coupling. As a variant, Higgs-scalar singlet system has been also considered in the literature [73] (see also [74][75][76]). Modulo the subtle issues of the unitarity problem [77][78][79][80][81], our model indeed allows inflation along Higgs direction since Higgs potential is stabilized by the help of a coupling to the singlet scalar X.…”

Section: Higgs Inflationmentioning

confidence: 99%

Singlet portal extensions of the standard seesaw models to a dark sector with local dark symmetry

Baek¹,

Ko²,

Park³

2013

J. High Energ. Phys.

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Assuming (i) the seesaw mechanism works for neutrino masses and mixings, (ii) dark matter is absolutely stable due to unbroken U (1) X dark gauge symmetry, and (iii) the singlet fields (H † H and N R ) are portal to the dark sector, we construct a simple model which is consistent with all the cosmological observations as well as terrestrial experiments available as of now, including leptogenesis, extra dark radiation of ∼ 8% (resulting in N eff = 3.130 the effective number of neutrino species), Higgs inflation, small and large scale structure formation, and current relic density of scalar dark matter (X). The electroweak vacuum of this model is stable up to Planck scale for m H = 125 GeV without any other new physics. The Higgs signal strength is equal to one as in the standard model for unbroken U (1) X case with a scalar dark matter, but it could be less than one independent of decay channels if the dark matter is a dark sector fermion or if U (1) X is spontaneously broken, because of a mixing with a new neutral scalar boson in the models. Detailed study of Higgs properties at the LHC would shed light on the models described in this work.

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Higgs-dilaton cosmology: From the early to the late Universe

Cited by 241 publications

References 98 publications

Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

Horizon-flow off-track for inflation

Singlet portal extensions of the standard seesaw models to a dark sector with local dark symmetry

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