Revised 
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 parameter in a curvaton scenario

Liu, Leihua; Liang, Bin; Zhou, Ya-Chen; Liu, Xiaodan; Xu, Wu-Long; Li, Ai-chen

doi:10.1103/physrevd.103.063515

Cited by 4 publications

(2 citation statements)

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“…In this paper, we investigate the formation of PBHs during the preheating period using the instability of the Mathieu equation. In contrast with previous studies [78,94,95], we implement the running mass of the curvaton, which is proportional to (2), to investigate the formation of PBHs during the deeply preheating period (induced by the second inflation). Thus, the mass of the curvaton varies from COBE normalization to the DE scale determined by as the inflaton finishes the decay.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…By considering our model, the curvaton originates from the decay of the inflaton; thus, the formation of PBHs is an inevitable process (the value of PBH abundance is sufficiently analyzed in Ref. [95]), for which the criterion of PBH formation is the duration of preheating. Therefore, the power spectrum is mainly characterized by the scale rather than the key feature of the instability of the Mathieu equation describing the preheating period.…”

Section: Lei-hua Liumentioning

confidence: 99%

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Primordial black hole from the running curvaton*

Liu

2023

Chinese Phys. C

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In light of our previous work \cite{Liu:2019xhn}, we investigate the possibility of the formation of a primordial black hole in the second inflationary process induced by the oscillation of curvaton. By adopting the instability of the Mathieu equation, one could utilize the $\delta$ function to fully describe the power spectrum. Due to the running of curvaton mass, we can simulate the value of abundance of primordial black holes nearly covering all of the mass ranges, in which we have given three special cases. One case could account for the dark matter in some sense since the abundance of a primordial black hole is about $75\%$. At late times, the relic of exponential potential could be approximated to a constant of the order of cosmological constant dubbed as a role of dark energy. Thus, our model could unify dark energy and dark matter from the perspective of phenomenology. Finally, it sheds new light on exploring Higgs physics.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Lei-hua Liumentioning

confidence: 99%

Primordial black hole from the running curvaton*

Liu

2023

Chinese Phys. C

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Primordial black holes in the curvaton model: possible connections to pulsar timing arrays and dark matter

Ferrante

Franciolini

Iovino

et al. 2023

J. Cosmol. Astropart. Phys.

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We revise primordial black holes (PBHs) production in the axion-curvaton model, in light of recent developments in the computation of their abundance accounting for non-gaussianities (NGs) in the curvature perturbation up to all orders. We find that NGs intrinsically generated in such scenarios have a relevant impact on the phenomenology associated to PBHs and, in particular, on the relation between the abundance and the signal of second-order gravitational waves. We show that this model could explain both the totality of dark matter in the asteroid mass range and the tentative signal reported by the NANOGrav and IPTA collaborations in the nano-Hz frequency range. En route, we provide a new, explicit computation of the power spectrum of curvature perturbations going beyond the sudden-decay approximation.

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