Hidden dark matter from Starobinsky inflation

Li, Qiang; Moroi, Takeo; Nakayama, Kazunori; Yin, Wen

doi:10.1007/jhep09(2021)179

Cited by 9 publications

(10 citation statements)

References 102 publications

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“…The Starobinsky inflation predicts the scalar spectral index and the tensor-toscalar ratio consistent with the observations [44]. In addition, the Starobinsky inflation provides an interesting possibility of producing hidden-sector dark matter via the decay of the inflaton [45][46][47][48]. Phenomenology based on the Starobinsky inflation crucially depends on the stability of the electroweak vacuum during and after the inflation.…”

Section: Introductionsupporting

confidence: 53%

Instability of the Electroweak Vacuum in Starobinsky Inflation

Li,

Moroi,

Nakayama

et al. 2022

Preprint

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We study the stability of the electroweak vacuum during and after the Starobinsky inflation, assuming the existence of the non-minimal Higgs coupling to the Ricci scalar. In the Starobinsky inflation, there exists R 2 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 R 2 term.

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Section: Introductionsupporting

confidence: 53%

Instability of the Electroweak Vacuum in Starobinsky Inflation

Li,

Moroi,

Nakayama

et al. 2022

Preprint

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“…The non-minimal coupling may enhance the partial decay rate of the inflaton into the visible sector, while it may be also important to stabilize the electroweak vacuum during and after inflation. More detail about this issue will be discussed in elsewhere [77].…”

Section: Discussionmentioning

confidence: 99%

“…We translate the result of [69] to constrain the nonminimal coupling of the Higgs in the Starobinsky inflation model. (More detailed study about the stability of the electroweak vacuum in the Starobinsky inflation is left as a future project [77].) For the chaotic inflation, the smallest effective mass allowed by the stability of the electroweak vacuum is found to be about −5 × 10 27 GeV 2 .…”

Section: Constraintsmentioning

confidence: 98%

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Hidden Dark Matter from Starobinsky Inflation

Li,

Moroi,

Nakayama

et al. 2021

Preprint

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The Starobinsky inflation model is one of the simplest inflation models that is consistent with the cosmic microwave background observations. In order to explain dark matter of the universe, we consider a minimal extension of the Starobinsky inflation model with introducing the dark sector which communicates with the visible sector only via the gravitational interaction. In Starobinsky inflation model, a sizable amount of dark-sector particle may be produced by the inflaton decay. Thus, a scalar, a fermion or a vector boson in the dark sector may become dark matter. We pay particular attention to the case with dark non-Abelian gauge interaction to make a dark glueball a dark matter candidate. In the minimal setup, we show that it is difficult to explain the observed dark matter abundance without conflicting observational constraints on the coldness and the self-interaction of dark matter. We propose scenarios in which the dark glueball, as well as other dark-sector particles, from the inflaton decay become viable dark matter candidates. We also discuss possibilities to test such scenarios.

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“…Gravitational dark matter production can also be encoded in the DM non-minimal coupling to gravity [35], which corresponds to a specific choice of higher dimensional operators in our approach. A related option is provided by gravity-induced inflaton decay in Starobinsky-like models [36].…”

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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Hidden dark matter from Starobinsky inflation

Cited by 9 publications

References 102 publications

Instability of the Electroweak Vacuum in Starobinsky Inflation

Instability of the Electroweak Vacuum in Starobinsky Inflation

Hidden Dark Matter from Starobinsky Inflation

On gravitational preheating

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