Massless preheating and electroweak vacuum metastability

Kost, Jeff; Shin, Chang Sub; Terada, Takahiro

doi:10.1103/physrevd.105.043508

Cited by 12 publications

(12 citation statements)

References 88 publications

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“…The lattice approach allows us to incorporate the couplings among the k-modes of the inflaton and DM, thereby accounting for backreaction and rescattering. The latter can have a crucial impact on the dynamics of the system (see [29,30] for recent examples). Our numerical results are presented in Fig.…”

Section: Lattice Simulations: Reproducing the Correct Dm Abundancementioning

confidence: 99%

On gravitational preheating

Lebedev,

Yoon

2022

Preprint

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We consider dark matter production during the inflaton oscillation epoch. It is conceivable that renormalizable interactions between dark matter and inflaton may be negligible. In this case, the leading role is played by higher dimensional operators generated by gravity and thus suppressed by the Planck scale. We focus on dim-6 operators and study the corresponding particle production in perturbative and non-perturbative regimes. We find that the dark matter production rate is dominated by non-derivative operators involving higher powers of the inflaton field. Even if they appear with small Wilson coefficients, such operators can readily account for the correct dark matter abundance.

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Section: Lattice Simulations: Reproducing the Correct Dm Abundancementioning

confidence: 99%

On gravitational preheating

Lebedev,

Yoon

2022

Preprint

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“…Hereafter, we concentrate on the case with the non-minimal coupling of the Higgs. Even though the non-minimal coupling stabilizes the Higgs potential during the inflation, it may cause an instability after the inflation [29][30][31][32][33][34][35][36][37][38]. With the non-minimal coupling, the effective mass of the Higgs may have significant time-dependence because of the oscillatory behavior of the Ricci scalar after inflation.…”

Section: Introductionmentioning

confidence: 99%

Instability of the electroweak vacuum in Starobinsky inflation

Moroi

Nakayama

et al. 2022

J. High Energ. Phys.

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We study the stability of the electroweak vacuum during and after the Starobinky inflation, assuming the existence of the non-minimal Higgs coupling to the Ricci scalar. In the Starobinsky inflation, there exists R2 term (with R being the Ricci scalar), which modifies the evolution equation of the Higgs field. We consider the case that the non-minimal coupling is sizable so that the quantum fluctuation of the Higgs field is suppressed and that the Higgs amplitude is settled near the origin during the inflation. In such a case, the Higgs amplitude may be amplified in the preheating epoch after inflation because of the parametric resonance due to the non-minimal coupling. We perform a detailed analysis of the evolution of the Higgs field in the preheating epoch by a numerical lattice simulation and derive an upper bound on the non-minimal coupling constant ξ in order to realize the electroweak vacuum in the present universe. We find that the upper bound on ξ in the Starobinsky inflation model is more stringent than that in conventional inflation models without the R2 term.

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“…[14, focusing on inflation, the Refs. [40][41][42][43][44][45][46][47][48][49] for studies discussing the reheating phase and the Refs. [50][51][52][53][54][55][56][57][58][59][60] discussing cosmological signatures and other observable consequences.…”

Section: Introductionmentioning

confidence: 99%

The effective Higgs potential and vacuum decay in Starobinsky inflation

Mantziris,

Markkanen,

Rajantie

2022

Preprint

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Based on the current experimental data, the Standard Model predicts that the current vacuum state of the Universe is metastable, leading to a non-zero rate of vacuum decay through nucleation of bubbles of true vacuum. Our existence implies that there cannot have been any such bubble nucleation events anywhere in our whole past lightcone. We consider a minimal scenario of the Standard Model together with Starobinsky inflation, using three-loop renormalization group improved Higgs effective potential with one-loop curvature corrections. We show that the survival of the vacuum state through inflation places a lower bound ξ 0.1 on the non-minimal Higgs curvature coupling, the last unknown parameter of the Standard Model. This bound is significantly stronger than in single field inflation models with no Higgs-inflaton coupling. It is also sensitive to the details of the dynamics at the end of inflation, and therefore it can be improved with a more detailed study of that period.

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Massless preheating and electroweak vacuum metastability

Cited by 12 publications

References 88 publications

On gravitational preheating

On gravitational preheating

Instability of the electroweak vacuum in Starobinsky inflation

The effective Higgs potential and vacuum decay in Starobinsky inflation

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