Primordial black holes in Gauss-Bonnet gravity
In this paper, we investigate the production of primordial black holes (PBHs) during the preheating era. Indeed, the amplification of field fluctuations can lead to the amplification of curvature perturbations. The overproduction of primordial black holes can occur if curvature perturbations on smal...
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Elsevier
2025-06-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026932500214X |
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| author | Brahim Asfour Aatifa Bargach Yahya Ladghami Ahmed Errahmani Taoufik Ouali |
| author_facet | Brahim Asfour Aatifa Bargach Yahya Ladghami Ahmed Errahmani Taoufik Ouali |
| author_sort | Brahim Asfour |
| collection | DOAJ |
| description | In this paper, we investigate the production of primordial black holes (PBHs) during the preheating era. Indeed, the amplification of field fluctuations can lead to the amplification of curvature perturbations. The overproduction of primordial black holes can occur if curvature perturbations on small scales are sufficiently large. In this study, we explore the Gauss-Bonnet inflation model with Power-law potential, V(ϕ)=V0ϕn, and monomial Gauss-Bonnet coupling function, ξ(ϕ)=ξ0ϕn. Additionally, we examine a two-field preheating model with a quadratic inflaton potential. After that, we calculate and present the mass variance and the fraction of the total energy density collapsing into PBHs taking into account some specific values of the parameter, α, relating the dimensionless constants of the power-law potential and the monomial coupling function, for n=2. Our findings indicate that the PBHs production is influenced by the model parameter with an increasing probability of PBHs production as α increases. Furthermore, the duration of preheating, mΔt, affects the range of k/kend within which PBHs production is consistent with observations. Finally, we study the abundance of PBHs produced. In the case where mΔt=10 and n=2, we find that PBHs can constitute a fraction of the present dark matter in the Universe for the three considered values of α, namely α=−1.5×10−6,−2×10−6 and −2.5×10−6. |
| format | Article |
| id | doaj-art-3eb463bce5e848eda40ee40192c5b195 |
| institution | OA Journals |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
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| series | Physics Letters B |
| spelling | doaj-art-3eb463bce5e848eda40ee40192c5b1952025-08-20T02:14:15ZengElsevierPhysics Letters B0370-26932025-06-0186513945310.1016/j.physletb.2025.139453Primordial black holes in Gauss-Bonnet gravityBrahim Asfour0Aatifa Bargach1Yahya Ladghami2Ahmed Errahmani3Taoufik Ouali4Laboratory of Physics of Matter and Radiation, University of Mohammed first, BP 717, Oujda, Morocco; Astrophysical and Cosmological Center, Faculty of Sciences, BP 717, Oujda, Morocco; Corresponding author.Laboratory of Physics of Matter and Radiation, University of Mohammed first, BP 717, Oujda, Morocco; Astrophysical and Cosmological Center, Faculty of Sciences, BP 717, Oujda, MoroccoLaboratory of Physics of Matter and Radiation, University of Mohammed first, BP 717, Oujda, Morocco; Astrophysical and Cosmological Center, Faculty of Sciences, BP 717, Oujda, MoroccoLaboratory of Physics of Matter and Radiation, University of Mohammed first, BP 717, Oujda, Morocco; Astrophysical and Cosmological Center, Faculty of Sciences, BP 717, Oujda, MoroccoLaboratory of Physics of Matter and Radiation, University of Mohammed first, BP 717, Oujda, Morocco; Astrophysical and Cosmological Center, Faculty of Sciences, BP 717, Oujda, MoroccoIn this paper, we investigate the production of primordial black holes (PBHs) during the preheating era. Indeed, the amplification of field fluctuations can lead to the amplification of curvature perturbations. The overproduction of primordial black holes can occur if curvature perturbations on small scales are sufficiently large. In this study, we explore the Gauss-Bonnet inflation model with Power-law potential, V(ϕ)=V0ϕn, and monomial Gauss-Bonnet coupling function, ξ(ϕ)=ξ0ϕn. Additionally, we examine a two-field preheating model with a quadratic inflaton potential. After that, we calculate and present the mass variance and the fraction of the total energy density collapsing into PBHs taking into account some specific values of the parameter, α, relating the dimensionless constants of the power-law potential and the monomial coupling function, for n=2. Our findings indicate that the PBHs production is influenced by the model parameter with an increasing probability of PBHs production as α increases. Furthermore, the duration of preheating, mΔt, affects the range of k/kend within which PBHs production is consistent with observations. Finally, we study the abundance of PBHs produced. In the case where mΔt=10 and n=2, we find that PBHs can constitute a fraction of the present dark matter in the Universe for the three considered values of α, namely α=−1.5×10−6,−2×10−6 and −2.5×10−6.http://www.sciencedirect.com/science/article/pii/S037026932500214XPrimordial black holesGB gravityPreheatingDark matter |
| spellingShingle | Brahim Asfour Aatifa Bargach Yahya Ladghami Ahmed Errahmani Taoufik Ouali Primordial black holes in Gauss-Bonnet gravity Physics Letters B Primordial black holes GB gravity Preheating Dark matter |
| title | Primordial black holes in Gauss-Bonnet gravity |
| title_full | Primordial black holes in Gauss-Bonnet gravity |
| title_fullStr | Primordial black holes in Gauss-Bonnet gravity |
| title_full_unstemmed | Primordial black holes in Gauss-Bonnet gravity |
| title_short | Primordial black holes in Gauss-Bonnet gravity |
| title_sort | primordial black holes in gauss bonnet gravity |
| topic | Primordial black holes GB gravity Preheating Dark matter |
| url | http://www.sciencedirect.com/science/article/pii/S037026932500214X |
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