Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results
This paper concludes our semianalytic study of preheating in inflationary models comprised of multiple scalar fields coupled nonminimally to gravity. Using the covariant framework of paper I in this series, we extend the rigid-spacetime results of paper II by considering both the expansion of the Un...
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| Format: | Article |
| Language: | English |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/113868 https://orcid.org/0000-0002-5054-6744 |
| _version_ | 1826194876401713152 |
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| author | DeCross, Matthew P. Kaiser, David I. Prabhu, Anirudh Prescod-Weinstein, Chanda Sfakianakis, Evangelos I. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics DeCross, Matthew P. Kaiser, David I. Prabhu, Anirudh Prescod-Weinstein, Chanda Sfakianakis, Evangelos I. |
| author_sort | DeCross, Matthew P. |
| collection | MIT |
| description | This paper concludes our semianalytic study of preheating in inflationary models comprised of multiple scalar fields coupled nonminimally to gravity. Using the covariant framework of paper I in this series, we extend the rigid-spacetime results of paper II by considering both the expansion of the Universe during preheating, as well as the effect of the coupled metric perturbations on particle production. The adiabatic and isocurvature perturbations are governed by different effective masses that scale differently with the nonminimal couplings and evolve differently in time. The effective mass for the adiabatic modes is dominated by contributions from the coupled metric perturbations immediately after inflation. The metric perturbations contribute an oscillating tachyonic term that enhances an early period of significant particle production for the adiabatic modes, which ceases on a time scale governed by the nonminimal couplings ξ[subscript I]. The effective mass of the isocurvature perturbations, on the other hand, is dominated by contributions from the fields’ potential and from the curvature of the field-space manifold (in the Einstein frame), the balance between which shifts on a time scale governed by ξ[subscript I]. As in papers I and II, we identify distinct behavior depending on whether the nonminimal couplings are small [ξ[subscript I]≲O(1)], intermediate [ξ[subscript I]∼O(1-10)], or large (ξ[subscript I]≥100). |
| first_indexed | 2024-09-23T10:03:34Z |
| format | Article |
| id | mit-1721.1/113868 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:03:34Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1138682022-09-26T15:26:53Z Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results DeCross, Matthew P. Kaiser, David I. Prabhu, Anirudh Prescod-Weinstein, Chanda Sfakianakis, Evangelos I. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Program in Science, Technology and Society DeCross, Matthew P. Kaiser, David I. Prabhu, Anirudh This paper concludes our semianalytic study of preheating in inflationary models comprised of multiple scalar fields coupled nonminimally to gravity. Using the covariant framework of paper I in this series, we extend the rigid-spacetime results of paper II by considering both the expansion of the Universe during preheating, as well as the effect of the coupled metric perturbations on particle production. The adiabatic and isocurvature perturbations are governed by different effective masses that scale differently with the nonminimal couplings and evolve differently in time. The effective mass for the adiabatic modes is dominated by contributions from the coupled metric perturbations immediately after inflation. The metric perturbations contribute an oscillating tachyonic term that enhances an early period of significant particle production for the adiabatic modes, which ceases on a time scale governed by the nonminimal couplings ξ[subscript I]. The effective mass of the isocurvature perturbations, on the other hand, is dominated by contributions from the fields’ potential and from the curvature of the field-space manifold (in the Einstein frame), the balance between which shifts on a time scale governed by ξ[subscript I]. As in papers I and II, we identify distinct behavior depending on whether the nonminimal couplings are small [ξ[subscript I]≲O(1)], intermediate [ξ[subscript I]∼O(1-10)], or large (ξ[subscript I]≥100). United States. Department of Energy (Contract DE-SC0012567) Massachusetts Institute of Technology. Undergraduate Research Opportunities Program Massachusetts Institute of Technology. Center for Theoretical Physics 2018-02-22T18:59:48Z 2018-02-22T18:59:48Z 2018-01 2016-11 2018-02-07T20:54:54Z Article http://purl.org/eprint/type/JournalArticle 2470-0010 2470-0029 http://hdl.handle.net/1721.1/113868 DeCross, Matthew P., et al. “Preheating after Multifield Inflation with Nonminimal Couplings. III. Dynamical Spacetime Results.” Physical Review D, vol. 97, no. 2, Jan. 2018. © 2018 American Physical Society https://orcid.org/0000-0002-5054-6744 en http://dx.doi.org/10.1103/PhysRevD.97.023528 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | DeCross, Matthew P. Kaiser, David I. Prabhu, Anirudh Prescod-Weinstein, Chanda Sfakianakis, Evangelos I. Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results |
| title | Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results |
| title_full | Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results |
| title_fullStr | Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results |
| title_full_unstemmed | Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results |
| title_short | Preheating after multifield inflation with nonminimal couplings. III. Dynamical spacetime results |
| title_sort | preheating after multifield inflation with nonminimal couplings iii dynamical spacetime results |
| url | http://hdl.handle.net/1721.1/113868 https://orcid.org/0000-0002-5054-6744 |
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