Constraints on primordial curvature perturbations from primordial black hole dark matter and secondary gravitational waves

Lu, Yizhou; Gong, Yungui; Zhu, Yanjun; Zhang, Fengge

doi:10.1088/1475-7516/2019/12/031

Cited by 82 publications

(65 citation statements)

References 83 publications

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“…A plethora of single field inflationary models have been constructed [7] and new models continue to be proposed. For example, the recently proposed constant roll inflation [8][9][10][11][12][13] may be used to generate large density perturbation at small scales to seed the formation of primordial black holes [14][15][16][17][18]. The constraints n s = 0.965 ± 0.004 (68% C.L.)…”

Section: Introductionmentioning

confidence: 99%

$$\alpha $$-attractor from superconformal E-models in brane inflation

et al. 2020

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In the large extra dimensional braneworld inflation, Friedmann equation is modified to include a quadratic term in energy density with an additional parameter λ called brane tension in addition to the usual linear term. The high energy brane corrections modify the slow-roll parameters and affect the behaviour of inflation. We analyse the superconformal inflation for E-models and find that there exist α-attractors in brane inflation. The predictions for the scalar spectral index n s and the tensor-to-scalar ratio r are computed numerically, and approximate analytic formulas in the high energy limit have been given for the observable n s and r. The constraints on the model parameters are obtained by using Planck 2018 and BICEP2 observational data.

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Section: Introductionmentioning

confidence: 99%

$$\alpha $$-attractor from superconformal E-models in brane inflation

et al. 2020

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“…8, we show the GW spectra of the benchmarks given in Table I, for the GW scenario. The sensitivity curves for TianQin and LISA [66,67] are plotted as the boundaries of the shaded regions. Only the spectra of two limiting benchmarks lie below the sensitivity curves.…”

Section: B Prospects Of the Gw Signalmentioning

confidence: 99%

Scale genesis by dark matter and its gravitational wave signal

Kang

Zhu

2020

Phys. Rev. D

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Classical scale invariance (CSI) may shed light on the weak scale origin, but the realistic CSI extension to the standard model requires a bosonic trigger. We propose a scalar dark matter (DM) field X as the trigger, establishing a strong connection between the successful radiative breaking of CSI and DM phenomenologies. The latter forces the breaking scale to approximately OðTeVÞ. It brightens the test prospect of this scenario via a gravitational wave, a sharp prediction of CSI phase transition (CSIPT), which is first order and has strong supercooling. Moreover, we carefully deal with some techniques which are commonly used to analyze CSIPT but may be missed. In particular, we clarify the imprecision of Witten's formula used in the single field case to calculate the bubble nucleation rate and stress that the essence of Witten's approximation is the validity of high-temperature expansion.

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“…From Equation (33), we see that to be consistent with the observations n s < 1, we must take α < 0 because H > 0, so the constant-roll inflation with η H 3 may be consistent with the observations. Equations (29) and (32) show that the amplitudes of the power spectra for both the slow-roll and ultra-slow-roll inflation have the same form. From Equations (30) and (33), we see that the power spectra for both the slow-roll and ultra-slow-roll inflation are nearly scale invariant.…”

Section: The Duality Between the Slow-roll And The Ultra Slow-roll Inmentioning

confidence: 99%

“…The difference in H may cause different amplitudes for the power spectra or different energy scale of inflation. Furthermore, due to the smallness of H in the ultra-slow-roll inflation, it can be used to generate a large curvature perturbation at small scales, which produces primordial black holes and secondary gravitational waves [26][27][28][29]. For more discussion on the constant-roll inflation, see, e.g., in [30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

On the Constant-Roll Inflation with Large and Small ηH

2019

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We study the apparent duality between large and small η H for the constant-roll inflation with the second slow-roll parameter η H being a constant. In the previous studies, only the constant-roll inflationary models with small η H are found to be consistent with the observations. The apparent duality suggests that the constant-roll inflationary models with large η H may be also consistent with the observations. We find that the duality between the constant-roll inflation with large and small η H does not exist, because both the background and scalar perturbation evolutions are very different. By fitting the constant-roll inflationary models to the observations, we get −0.016 ≤ η H ≤ −0.0078 at the 95% C.L if we take N = 60 for the models with increasing H , in which inflation ends when H = 1. For the models with decreasing H , we obtain 3.0135 ≤ η H ≤ 3.021 at the 68% C.L. and 3.0115 ≤ η H ≤ 3.024 at the 95% C.L.

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Constraints on primordial curvature perturbations from primordial black hole dark matter and secondary gravitational waves

Cited by 82 publications

References 83 publications

$$\alpha $$-attractor from superconformal E-models in brane inflation

$$\alpha $$-attractor from superconformal E-models in brane inflation

Scale genesis by dark matter and its gravitational wave signal

On the Constant-Roll Inflation with Large and Small ηH

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