Climbing over the potential barrier during inflation via null energy condition violation
Abstract The violation of the null energy condition (NEC) may play a crucial role in enabling a scalar field to climb over high potential barriers, potentially significant in the very early universe. We propose a single-field model where the universe sequentially undergoes a first stage of slow-roll...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-09-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-13340-1 |
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| _version_ | 1846164922709311488 |
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| author | Shi Pan Yong Cai Yun-Song Piao |
| author_facet | Shi Pan Yong Cai Yun-Song Piao |
| author_sort | Shi Pan |
| collection | DOAJ |
| description | Abstract The violation of the null energy condition (NEC) may play a crucial role in enabling a scalar field to climb over high potential barriers, potentially significant in the very early universe. We propose a single-field model where the universe sequentially undergoes a first stage of slow-roll inflation, NEC violation, and a second stage of slow-roll inflation. Through the NEC violation, the scalar field climbs over high potential barriers, leaving unique characteristics on the primordial gravitational wave power spectrum, including a blue-tilted nature in the middle-frequency range and diminishing oscillation amplitudes at higher frequencies. Additionally, the power spectrum exhibits nearly scale-invariant behavior on both large and small scales. |
| format | Article |
| id | doaj-art-b823efdebd654a6f97f1dfdaff00d293 |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-b823efdebd654a6f97f1dfdaff00d2932024-11-17T12:44:33ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-09-0184911310.1140/epjc/s10052-024-13340-1Climbing over the potential barrier during inflation via null energy condition violationShi Pan0Yong Cai1Yun-Song Piao2School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCASInstitute for Astrophysics, School of Physics, Zhengzhou UniversitySchool of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCASAbstract The violation of the null energy condition (NEC) may play a crucial role in enabling a scalar field to climb over high potential barriers, potentially significant in the very early universe. We propose a single-field model where the universe sequentially undergoes a first stage of slow-roll inflation, NEC violation, and a second stage of slow-roll inflation. Through the NEC violation, the scalar field climbs over high potential barriers, leaving unique characteristics on the primordial gravitational wave power spectrum, including a blue-tilted nature in the middle-frequency range and diminishing oscillation amplitudes at higher frequencies. Additionally, the power spectrum exhibits nearly scale-invariant behavior on both large and small scales.https://doi.org/10.1140/epjc/s10052-024-13340-1 |
| spellingShingle | Shi Pan Yong Cai Yun-Song Piao Climbing over the potential barrier during inflation via null energy condition violation European Physical Journal C: Particles and Fields |
| title | Climbing over the potential barrier during inflation via null energy condition violation |
| title_full | Climbing over the potential barrier during inflation via null energy condition violation |
| title_fullStr | Climbing over the potential barrier during inflation via null energy condition violation |
| title_full_unstemmed | Climbing over the potential barrier during inflation via null energy condition violation |
| title_short | Climbing over the potential barrier during inflation via null energy condition violation |
| title_sort | climbing over the potential barrier during inflation via null energy condition violation |
| url | https://doi.org/10.1140/epjc/s10052-024-13340-1 |
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