Higgs Field in Cosmology

Steinwachs, Christian F.

doi:10.1007/978-3-030-51197-5_11

Cited by 9 publications

(7 citation statements)

References 135 publications

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“…For comparison purposes, the central value of the top quark mass M t = 172.76 GeV [40] JHEP11(2021)091 is marked by the black dashed line in the left panel, while the corresponding value of a is indicated by the red star in the right panel. The thickness of each curve results from the variation of the non-minimal coupling constant, from ξ = 100 to ξ = 5000, showing a mild dependence of the running equations to this parameter [87]. As expected, the magnitude of λ(M P ) becomes greater and positive as M t moves away from its low-energy value.…”

Section: Jhep11(2021)091supporting

confidence: 56%

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Rodrigues

Benetti

Alcaniz

2021

J. High Energ. Phys.

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In this work, we revisit the non-minimally coupled Higgs Inflation scenario and investigate its observational viability in light of the current Cosmic Microwave Background, Baryon Acoustic Oscillation and type Ia Supernovae data. We explore the effects of the Coleman-Weinberg approximation to the Higgs potential in the primordial universe, connecting the predictions for the Lagrangian parameters at inflationary scales to the electroweak observables through Renormalization Group methods at two-loop order. Initially, we find that electroweak scale measurements may be dissonant to the limits obtained from the cosmological data sets used in the analysis. Specifically, an ≈ 8σ-discrepancy between the inflationary parameters and the value of the Monte Carlo reconstructed top quark mass is found. However, considering the most recent results obtained by the CMS Collaboration from differential cross-section measurements of the top quark production a good agreement is obtained.

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Section: Jhep11(2021)091supporting

confidence: 56%

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Rodrigues

Benetti

Alcaniz

2021

J. High Energ. Phys.

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show abstract

“…For comparison purposes, the central value of the top quark pole mass M t = 172.76 GeV [38] is marked by the black dashed line in the left panel, while the corresponding value of a is indicated by the red star in the right panel. The thickness of each curve results from the variation of the non-minimal coupling constant, from ξ = 100 to ξ = 5000, showing a mild dependence of the running equations to this parameter [76]. As expected, the magnitude of λ(M P ) becomes greater and positive as M t moves away from its observed low-energy value.…”

Section: Renormalization Group Equationssupporting

confidence: 55%

Discrepancy between cosmological and electroweak observables in Higgs Inflation

Rodrigues,

Benetti,

Alcaniz

2021

Preprint

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In this work, we revisit the non-minimally coupled Higgs Inflation scenario and investigate its observational viability in light of the current Cosmic Microwave Background, Baryon Acoustic Oscillation and type Ia Supernovae data. We explore the effects of the Coleman-Weinberg approximation to the Higgs potential in the primordial universe, connecting the predictions for the Lagrangian parameters at inflationary scales to the electroweak observables through Renormalization Group methods at two-loop order. As the main result, we find that observations on the electroweak scale are in disagreement with the constraints obtained from the cosmological data sets used in the analysis. Specifically, an ≈ 8σ-discrepancy between the inflationary parameters and the electroweak value of the top quark mass is found, which suggests that a significant deviation from the scenario analysed is required by the cosmological data.

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“…But despite the phenomenological success of the theory, the usual implementation of inflation via scalar fields called inflatons comes with its own problems [7,8]. Inflaton models usually violate energy conditions [9,10], and the fundamental nature of inflatons also remains an open question [11,12]. These reasons continue to motivate the search for alternative mechanisms [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Testing time-delayed cosmology

2022

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Inspired by nonlocal gravity theories, time-delayed cosmology proposes a delayed Friedmann equation that generically predicts an inflationary period with a natural end. The key parameter of this proposal is a time delay that is presumed to be very small in order for the model to evade potential astrophysical constraints. This work subjects this small-delay assumption to a test. We address the question of just how large a time delay can be accommodated within our current cosmological data. In order to do so, we do not restrict the model to the inflationary era and consider its possible operation in the late Universe as well, with an eye for any smoking-gun features that may indicate the presence of a time delay. We study the background evolution predicted by the delayed Friedmann equation and determine the growth of Newtonian perturbations in this delayed background. We show that a surprisingly large late-time cosmic delay is statistically consistent with Hubble expansion rate and growth data. Based on these observables, we also find that the standard $$\varLambda $$ Λ CDM model has no advantage over time-delayed cosmology in terms of the Bayes factor.

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Higgs Field in Cosmology

Cited by 9 publications

References 135 publications

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Discrepancy between cosmological and electroweak observables in Higgs Inflation

Testing time-delayed cosmology

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