Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
Abstract We present a complete and consistent exposition of the regularization, renormalization, and resummation procedures in the setup of having a contraction and then non-singular bounce followed by inflation with a sharp transition from slow-roll (SR) to ultra-slow roll (USR) phase for generatin...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-11-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-13460-8 |
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| author | Sayantan Choudhury Ahaskar Karde Sudhakar Panda Soumitra SenGupta |
| author_facet | Sayantan Choudhury Ahaskar Karde Sudhakar Panda Soumitra SenGupta |
| author_sort | Sayantan Choudhury |
| collection | DOAJ |
| description | Abstract We present a complete and consistent exposition of the regularization, renormalization, and resummation procedures in the setup of having a contraction and then non-singular bounce followed by inflation with a sharp transition from slow-roll (SR) to ultra-slow roll (USR) phase for generating primordial black holes (PBHs). We consider following an effective field theory (EFT) approach and study the quantum loop corrections to the power spectrum from each phase. We demonstrate the complete removal of quadratic UV divergences after renormalization and softened logarithmic IR divergences after resummation and illustrate the scheme-independent nature of our renormalization approach. We further show that the addition of a contracting and bouncing phase allows us to successfully generate PBHs of solar-mass order, $$M_\textrm{PBH}\sim \mathcal{O}(M_{\odot })$$ M PBH ∼ O ( M ⊙ ) , by achieving the minimum e-folds during inflation to be $$\Delta N_{\textrm{Total}}\sim \mathcal{O}(60)$$ Δ N Total ∼ O ( 60 ) and in this process successfully evading the strict no-go theorem. We notice that varying the effective sound speed between $$0.88\leqslant c_{s}\leqslant 1$$ 0.88 ⩽ c s ⩽ 1 , allows the peak spectrum amplitude to lie within $$10^{-3}\leqslant A \leqslant 10^{-2}$$ 10 - 3 ⩽ A ⩽ 10 - 2 , indicating that causality and unitarity remain protected in the theory. We analyse PBHs in the extremely small, $$M_{\textrm{PBH}}\sim \mathcal{O}(10^{-33}-10^{-27})M_{\odot }$$ M PBH ∼ O ( 10 - 33 - 10 - 27 ) M ⊙ , and the large, $$M_{\textrm{PBH}}\sim \mathcal{O}(10^{-6}-10^{-1})M_{\odot }$$ M PBH ∼ O ( 10 - 6 - 10 - 1 ) M ⊙ , mass limits and confront the PBH abundance results with the latest microlensing constraints. We also study the cosmological beta functions across all phases and find their interpretation consistent in the context of bouncing and inflationary scenarios while satisfying the pivot scale normalization requirement. Further, we estimate the spectral distortion effects and shed light on controlling PBH overproduction. |
| format | Article |
| id | doaj-art-f4d07fc0f80d435887a30ff9fd72b6c6 |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-f4d07fc0f80d435887a30ff9fd72b6c62024-12-29T12:42:27ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-11-01841118810.1140/epjc/s10052-024-13460-8Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formationSayantan Choudhury0Ahaskar Karde1Sudhakar Panda2Soumitra SenGupta3Centre For Cosmology and Science Popularization (CCSP), SGT UniversityCentre For Cosmology and Science Popularization (CCSP), SGT UniversityCentre For Cosmology and Science Popularization (CCSP), SGT UniversitySchool of Physical Sciences, Indian Association for the Cultivation of ScienceAbstract We present a complete and consistent exposition of the regularization, renormalization, and resummation procedures in the setup of having a contraction and then non-singular bounce followed by inflation with a sharp transition from slow-roll (SR) to ultra-slow roll (USR) phase for generating primordial black holes (PBHs). We consider following an effective field theory (EFT) approach and study the quantum loop corrections to the power spectrum from each phase. We demonstrate the complete removal of quadratic UV divergences after renormalization and softened logarithmic IR divergences after resummation and illustrate the scheme-independent nature of our renormalization approach. We further show that the addition of a contracting and bouncing phase allows us to successfully generate PBHs of solar-mass order, $$M_\textrm{PBH}\sim \mathcal{O}(M_{\odot })$$ M PBH ∼ O ( M ⊙ ) , by achieving the minimum e-folds during inflation to be $$\Delta N_{\textrm{Total}}\sim \mathcal{O}(60)$$ Δ N Total ∼ O ( 60 ) and in this process successfully evading the strict no-go theorem. We notice that varying the effective sound speed between $$0.88\leqslant c_{s}\leqslant 1$$ 0.88 ⩽ c s ⩽ 1 , allows the peak spectrum amplitude to lie within $$10^{-3}\leqslant A \leqslant 10^{-2}$$ 10 - 3 ⩽ A ⩽ 10 - 2 , indicating that causality and unitarity remain protected in the theory. We analyse PBHs in the extremely small, $$M_{\textrm{PBH}}\sim \mathcal{O}(10^{-33}-10^{-27})M_{\odot }$$ M PBH ∼ O ( 10 - 33 - 10 - 27 ) M ⊙ , and the large, $$M_{\textrm{PBH}}\sim \mathcal{O}(10^{-6}-10^{-1})M_{\odot }$$ M PBH ∼ O ( 10 - 6 - 10 - 1 ) M ⊙ , mass limits and confront the PBH abundance results with the latest microlensing constraints. We also study the cosmological beta functions across all phases and find their interpretation consistent in the context of bouncing and inflationary scenarios while satisfying the pivot scale normalization requirement. Further, we estimate the spectral distortion effects and shed light on controlling PBH overproduction.https://doi.org/10.1140/epjc/s10052-024-13460-8 |
| spellingShingle | Sayantan Choudhury Ahaskar Karde Sudhakar Panda Soumitra SenGupta Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation European Physical Journal C: Particles and Fields |
| title | Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation |
| title_full | Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation |
| title_fullStr | Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation |
| title_full_unstemmed | Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation |
| title_short | Regularized-renormalized-resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation |
| title_sort | regularized renormalized resummed loop corrected power spectrum of non singular bounce with primordial black hole formation |
| url | https://doi.org/10.1140/epjc/s10052-024-13460-8 |
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