Combined preheating on the lattice with applications to Higgs inflation

Repond, J.; Rubio, Javier

doi:10.1088/1475-7516/2016/07/043

Cited by 92 publications

(131 citation statements)

References 97 publications

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“…When the energy density into Standard Model particles becomes comparable to the background component, the resonant production of gauge bosons terminates due to backreaction effects. From there on, the energy transfer from the inflaton field to the Standard Model particles continues through a slower turbulent stage where the total energy of the Universe becomes democratically distributed among the different species [17,54,55]. Note that the above treatment does not account for the differences between transverse and longitudinal degrees of freedom.…”

Section: Preheating In Metric Higgs Inflationmentioning

confidence: 99%

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Preheating in Palatini Higgs inflation

Rubio

Tomberg

2019

J. Cosmol. Astropart. Phys.

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117

165

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We study the details of preheating in Palatini Higgs inflation. We show, that contrary to what happens in the metric formulation of the model, the Universe does not reheat through the creation of gauge bosons only, but also through the tachyonic production of Higgs excitations. The latest entropy production channel turns out to be very efficient and leads to an almost instantaneous onset of radiation domination after the end of inflation. As compared to the metric case, this reduces the number of e-folds needed to solve the usual hot big bang problems while leading to a smaller spectral index for the primordial spectrum of density perturbations.

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Section: Preheating In Metric Higgs Inflationmentioning

confidence: 99%

“…In this paper we study the preheating stage in Palatini Higgs inflation, highlighting the differences with the well-studied metric case [3,4,[16][17][18][19][20]24]. 1 We show that the main mechanisms leading to the onset of the hot big bang in these two alternative scenarios are indeed very different.…”

Section: Introductionmentioning

confidence: 97%

Preheating in Palatini Higgs inflation

Rubio

Tomberg

2019

J. Cosmol. Astropart. Phys.

Self Cite

117

165

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“…Reheating in Higgs inflation has been studied exhaustively in the metric case in [91,106] (see also [107,108]) but never before in the Palatini case. In the following, we will review the main results in the metric case and present the first calculations on reheating dynamics in the Palatini-Higgs inflation.…”

Section: Reheating In Higgs Inflationmentioning

confidence: 99%

Towards distinguishing variants of non-minimal inflation

Takahashi

Tenkanen

2019

J. Cosmol. Astropart. Phys.

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We study models of inflation where the scalar field φ that drives inflation is coupled non-minimally to gravity via ξφ 2 R, or where the gravity sector is enlarged by an R 2 term. We consider the original Higgs inflation, Starobinsky inflation, and two different versions of a scenario where the inflaton is a scalar field other than the Higgs, and discuss if they can be distinguished from each other by measuring the tensor-to-scalar ratio and runnings of the spectral index of primordial curvature perturbations, on top of the amplitude and spectral index of the perturbations. We consider both metric and Palatini theories of gravity, showing how detailed studies of non-minimally coupled models can help to identify the inflaton field and how they may provide for a way to also distinguish between different theories of gravity in the present context.1 As we will see, this does not necessarily amount to adding new degrees of freedom to the theory.

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“…Refs. [20][21][22] following the traditional procedure for inflationary models in GR [23][24][25][26], and it had been recognized that the depletion of the inflaton quanta is dominated by the nonperturbative production of the transverse mode of weak gauge bosons. However, it has been recently shown that the effective mass, m θ , of the phase direction of the inflaton or the Nambu-Goldstone (NG) mode, which would constitute the longitudinal mode of gauge bosons, exhibits a peculiar behavior [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

On the violent preheating in the mixed Higgs-R2 inflationary model

Jinno

Kamada

et al. 2019

Physics Letters B

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It has been argued that the mixed Higgs-R 2 model acts as the UV extension of the Higgs inflation, pushing up its cut-off scale in the vacuum close up to the Planck scale. In this letter, we study the inflaton oscillation stage after inflation, focusing on the effective mass of the phase direction of the Higgs field, which can cause a violent preheating process. We find that the "spikes" in the effective mass of the phase direction observed in the Higgs inflation still appear in the mixed Higgs-R 2 model. While the spikes appear above the cut-off scale in the Higgs-only case, they appear below the cut-off scale when the model is extended with R 2 term though reheating cannot be completed in the violent particle production regime since the spikes get milder.

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Combined preheating on the lattice with applications to Higgs inflation

Cited by 92 publications

References 97 publications

Preheating in Palatini Higgs inflation

Preheating in Palatini Higgs inflation

Towards distinguishing variants of non-minimal inflation

On the violent preheating in the mixed Higgs-R2 inflationary model

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