Non-minimal (self-)running inflation: metric vs. Palatini formulation

Racioppi, Antonio

doi:10.1007/jhep01(2021)011

Cited by 27 publications

(5 citation statements)

References 118 publications

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“…Meanwhile, the predicted tensor-to-scalar ratio r runs from small values in the negative regions of a to a asymptotic value r 0.072 at large radiative corrections. These asymptotic values are in agreement with the results obtained in [81][82][83]. In both panels, the parameters seem to acquire a slight sensitivity to ξ in the region 0.1 a 0.6.…”

Section: Slow-roll Analysissupporting

confidence: 90%

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: Slow-roll Analysissupporting

confidence: 90%

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Rodrigues

Benetti

Alcaniz

2021

J. High Energ. Phys.

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“…This term makes most inflationary models more compatible with the observations, such as the Starobinsky (R 2 inflation) model [12], which gives the best consistency for all current existing data. It is important to note that, in literature, inflation with a non-minimally coupled scalar field has been studied for two different formulations in gravity [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], Metric and Palatini formulations. In the Einstein-Hilbert Lagrangian, equations of motion are the same for both formulations.…”

Section: Introductionmentioning

confidence: 99%

Non-minimally coupled Natural Inflation: Palatini and Metric formalism with the recent BICEP/Keck

Bostan

2023

J. Cosmol. Astropart. Phys.

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In this work, we show the effect of the non-minimal coupling ξϕ 2 R on the inflationary parameters by considering the single-field inflation and present the inflationary predictions of the appealing potential for the particle physics viewpoint: Natural Inflation, an axion-like inflaton which has a cosine-type periodic potential and the inflaton naturally emerges as a pseudo-Nambu-Goldstone boson with a spontaneously broken global symmetry. We present the inflationary predictions for this potential, ns , r, and α = dns /d ln k. In addition, we assume standard thermal history after inflation, and using this, for considered potential, we show compatible regions for the ns , r within the recent BICEP/Keck results.

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“…The predictions of the two formalisms correspond to the same equations of motion, so they describe equivalent physical theories. However, in case of non-minimal couplings between gravity and matter, such equivalence is disappear and the two formulations illustrate different gravity theories [16,[23][24][25][26][27][28]. In the literature, Palatini formulation of inflation with non-minimal coupling debated in refs.…”

Section: Introductionmentioning

confidence: 99%

Preheating in radiative corrections to $ϕ^4$ inflation with non-minimal coupling in Palatini formulation

Bostan¹

2019

Preprint

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We discuss the impact of the preheating stage in radiative corrections due to interaction of the inflaton to fermions to φ 4 inflation with non-minimal coupling in Palatini formulation. In Palatini inflation with large non-minimal coupling the field is allow to return to the plateau region during the reheating stage, so the average equation of state per oscillations is closer to −1 than to 1/3. The incursion in the plateau leads, however, to a highly efficient tachyonic instability able to reheat the Universe in less than one e-fold. By taking into account prescription II discussed in the literature, in the wide range of κ − ξ, we figure out spectral index n s and tensor-to-scalar ratio r which are compatible with the data given by the Keck Array/BICEP2 and Planck collaborations.

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Non-minimal (self-)running inflation: metric vs. Palatini formulation

Cited by 27 publications

References 118 publications

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Possible discrepancies between cosmological and electroweak observables in Higgs Inflation

Non-minimally coupled Natural Inflation: Palatini and Metric formalism with the recent BICEP/Keck

Preheating in radiative corrections to $ϕ^4$ inflation with non-minimal coupling in Palatini formulation

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