Natural inflation with a nonminimal coupling to gravity
Although natural inflation is a theoretically well-motivated model for cosmic inflation, it is in tension with recent Planck cosmic microwave background anisotropy measurements. We present a way to alleviate this tension by considering a very weak nonminimal coupling of the inflaton field to gravity...
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description | Although natural inflation is a theoretically well-motivated model for cosmic inflation, it is in tension with recent Planck cosmic microwave background anisotropy measurements. We present a way to alleviate this tension by considering a very weak nonminimal coupling of the inflaton field to gravity in both contexts of metric and Palatini formulations of general relativity. We start our discussions with a generic form of the inflaton coupling to the Ricci scalar, then focus on a simple form to do phenomenological study. Our results show that such an extension can bring natural inflation's predictions to a good agreement with the Planck data. Depending on values of the coupling constant \(\xi\) and the symmetry breaking scale \(f\), we find that with \(|\xi|\sim 10^{-3}\) and \(f\gtrsim 2.0 M_{\mathrm{pl}}\) predictions of the model stay inside \(68\%\) CL allowed region until \(f\) increases up to \(7.7 M_{\mathrm{pl}}\), then only inside \(95\%\) CL region after \(f\) exceeds the latter value. The predictions from the metric and the Palatini theories are very similar due to the simple form of the coupling function we use and the small magnitude of the coupling \(\xi\). Successful reheating can also be realized in this model. |
doi_str_mv | 10.48550/arxiv.2012.14248 |
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We present a way to alleviate this tension by considering a very weak nonminimal coupling of the inflaton field to gravity in both contexts of metric and Palatini formulations of general relativity. We start our discussions with a generic form of the inflaton coupling to the Ricci scalar, then focus on a simple form to do phenomenological study. Our results show that such an extension can bring natural inflation's predictions to a good agreement with the Planck data. Depending on values of the coupling constant \(\xi\) and the symmetry breaking scale \(f\), we find that with \(|\xi|\sim 10^{-3}\) and \(f\gtrsim 2.0 M_{\mathrm{pl}}\) predictions of the model stay inside \(68\%\) CL allowed region until \(f\) increases up to \(7.7 M_{\mathrm{pl}}\), then only inside \(95\%\) CL region after \(f\) exceeds the latter value. The predictions from the metric and the Palatini theories are very similar due to the simple form of the coupling function we use and the small magnitude of the coupling \(\xi\). Successful reheating can also be realized in this model.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2012.14248</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Anisotropy ; Big Bang theory ; Broken symmetry ; Cosmic microwave background ; Coupling ; Gravitation ; Heating ; Physics - Cosmology and Nongalactic Astrophysics</subject><ispartof>arXiv.org, 2021-03</ispartof><rights>2021. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). 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The predictions from the metric and the Palatini theories are very similar due to the simple form of the coupling function we use and the small magnitude of the coupling \(\xi\). Successful reheating can also be realized in this model.</description><subject>Anisotropy</subject><subject>Big Bang theory</subject><subject>Broken symmetry</subject><subject>Cosmic microwave background</subject><subject>Coupling</subject><subject>Gravitation</subject><subject>Heating</subject><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><sourceid>GOX</sourceid><recordid>eNotj0tLAzEUhYMgWGp_gCsDrmdMbp5dSvFRKLrpfsg8UlOmyZjJVPvvja1ncxfn43I-hO4oKbkWgjya-OOOJRAKJeXA9RWaAWO00BzgBi3GcU8IAalACDZD6t2kKZoeO297k1zw-NulT2ywD_7gvDvkrgnT0Du_wyngXTRHl0636NqafuwW_3eOti_P29Vbsfl4Xa-eNoURoAtdg6qpymGNUKAYNEstJSVtbTkVwna6hWWraSM7Y3XbtZY3UgpB24xZy-bo_vL2bFUNMe-Jp-rPrjrbZeLhQgwxfE3dmKp9mKLPmyrgiglNuNLsF5ZoUag</recordid><startdate>20210324</startdate><enddate>20210324</enddate><creator>Yakefu Reyimuaji</creator><creator>Zhang, Xinyi</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20210324</creationdate><title>Natural inflation with a nonminimal coupling to gravity</title><author>Yakefu Reyimuaji ; Zhang, Xinyi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a528-8b27b177773c572732c986610dbf4155fe8d29d81c6eaf8dedf4c66551d866ff3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Anisotropy</topic><topic>Big Bang theory</topic><topic>Broken symmetry</topic><topic>Cosmic microwave background</topic><topic>Coupling</topic><topic>Gravitation</topic><topic>Heating</topic><topic>Physics - Cosmology and Nongalactic Astrophysics</topic><toplevel>online_resources</toplevel><creatorcontrib>Yakefu Reyimuaji</creatorcontrib><creatorcontrib>Zhang, Xinyi</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yakefu Reyimuaji</au><au>Zhang, Xinyi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Natural inflation with a nonminimal coupling to gravity</atitle><jtitle>arXiv.org</jtitle><date>2021-03-24</date><risdate>2021</risdate><eissn>2331-8422</eissn><abstract>Although natural inflation is a theoretically well-motivated model for cosmic inflation, it is in tension with recent Planck cosmic microwave background anisotropy measurements. We present a way to alleviate this tension by considering a very weak nonminimal coupling of the inflaton field to gravity in both contexts of metric and Palatini formulations of general relativity. We start our discussions with a generic form of the inflaton coupling to the Ricci scalar, then focus on a simple form to do phenomenological study. Our results show that such an extension can bring natural inflation's predictions to a good agreement with the Planck data. Depending on values of the coupling constant \(\xi\) and the symmetry breaking scale \(f\), we find that with \(|\xi|\sim 10^{-3}\) and \(f\gtrsim 2.0 M_{\mathrm{pl}}\) predictions of the model stay inside \(68\%\) CL allowed region until \(f\) increases up to \(7.7 M_{\mathrm{pl}}\), then only inside \(95\%\) CL region after \(f\) exceeds the latter value. 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subjects | Anisotropy Big Bang theory Broken symmetry Cosmic microwave background Coupling Gravitation Heating Physics - Cosmology and Nongalactic Astrophysics |
title | Natural inflation with a nonminimal coupling to gravity |
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