Multifield inflation after Planck: Isocurvature modes from nonminimal couplings
Recent measurements by the Planck experiment of the power spectrum of temperature anisotropies in the cosmic microwave background radiation reveal a deficit of power in low multipoles compared to the predictions from best-fit ΛCDM cosmology. If the low-ℓ anomaly persists after additional observation...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/89005 https://orcid.org/0000-0002-5054-6744 |
| _version_ | 1826207880837070848 |
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| author | Schutz, Katelin Sfakianakis, Evangelos I. Kaiser, David I. |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Schutz, Katelin Sfakianakis, Evangelos I. Kaiser, David I. |
| author_sort | Schutz, Katelin |
| collection | MIT |
| description | Recent measurements by the Planck experiment of the power spectrum of temperature anisotropies in the cosmic microwave background radiation reveal a deficit of power in low multipoles compared to the predictions from best-fit ΛCDM cosmology. If the low-ℓ anomaly persists after additional observations and analysis, it might be explained by the presence of primordial isocurvature perturbations in addition to the usual adiabatic spectrum, and hence may provide the first robust evidence that early-Universe inflation involved more than one scalar field. In this paper we explore the production of isocurvature perturbations in nonminimally coupled two-field inflation. We find that this class of models readily produces enough power in the isocurvature modes to account for the Planck low-ℓ anomaly, while also providing excellent agreement with the other Planck results. |
| first_indexed | 2024-09-23T13:56:25Z |
| format | Article |
| id | mit-1721.1/89005 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:56:25Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/890052022-09-28T17:13:24Z Multifield inflation after Planck: Isocurvature modes from nonminimal couplings Schutz, Katelin Sfakianakis, Evangelos I. Kaiser, David I. Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Program in Science, Technology and Society Schutz, Katelin Sfakianakis, Evangelos I. Kaiser, David I. Recent measurements by the Planck experiment of the power spectrum of temperature anisotropies in the cosmic microwave background radiation reveal a deficit of power in low multipoles compared to the predictions from best-fit ΛCDM cosmology. If the low-ℓ anomaly persists after additional observations and analysis, it might be explained by the presence of primordial isocurvature perturbations in addition to the usual adiabatic spectrum, and hence may provide the first robust evidence that early-Universe inflation involved more than one scalar field. In this paper we explore the production of isocurvature perturbations in nonminimally coupled two-field inflation. We find that this class of models readily produces enough power in the isocurvature modes to account for the Planck low-ℓ anomaly, while also providing excellent agreement with the other Planck results. United States. Dept. of Energy (Contract DE-FG02-05ER41360) Cameron and Hayden Lord Foundation (Undergraduate Research Fellowship) Massachusetts Institute of Technology. Undergraduate Research Opportunities Program 2014-08-25T13:21:21Z 2014-08-25T13:21:21Z 2014-03 2013-12 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/89005 Schutz, Katelin, Evangelos I. Sfakianakis, and David I. Kaiser. “Multifield Inflation after Planck: Isocurvature Modes from Nonminimal Couplings.” Phys. Rev. D 89, no. 6 (March 2014). © 2014 American Physical Society https://orcid.org/0000-0002-5054-6744 en_US http://dx.doi.org/10.1103/PhysRevD.89.064044 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. application/pdf American Physical Society American Physical Society |
| spellingShingle | Schutz, Katelin Sfakianakis, Evangelos I. Kaiser, David I. Multifield inflation after Planck: Isocurvature modes from nonminimal couplings |
| title | Multifield inflation after Planck: Isocurvature modes from nonminimal couplings |
| title_full | Multifield inflation after Planck: Isocurvature modes from nonminimal couplings |
| title_fullStr | Multifield inflation after Planck: Isocurvature modes from nonminimal couplings |
| title_full_unstemmed | Multifield inflation after Planck: Isocurvature modes from nonminimal couplings |
| title_short | Multifield inflation after Planck: Isocurvature modes from nonminimal couplings |
| title_sort | multifield inflation after planck isocurvature modes from nonminimal couplings |
| url | http://hdl.handle.net/1721.1/89005 https://orcid.org/0000-0002-5054-6744 |
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