Bianchi I Spacetimes in Chiral–Quintom Theory
In this paper, we study anisotropic exact solutions in the homogeneous Bianchi I background geometry in a multifield theory. Specifically, we consider the Chiral–Quintom theory, which is an extension of the Chiral theory, because at least one of the scalar fields can have negative energy density. Mo...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/8/10/503 |
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| author | Andronikos Paliathanasis |
| author_facet | Andronikos Paliathanasis |
| author_sort | Andronikos Paliathanasis |
| collection | DOAJ |
| description | In this paper, we study anisotropic exact solutions in the homogeneous Bianchi I background geometry in a multifield theory. Specifically, we consider the Chiral–Quintom theory, which is an extension of the Chiral theory, because at least one of the scalar fields can have negative energy density. Moreover, the Quintom theory can be recovered when one of the free parameters of the theory vanishes. We find that Kasner-like and anisotropic exponential solutions exist for specific functional forms of the scalar field potential. Finally, Noether symmetry analysis is applied for the classification of the theory according to the admitted symmetries. Conservation laws are determined, while we show that the Kasner-like solution is the analytic solution for the given model. |
| first_indexed | 2024-03-09T19:25:16Z |
| format | Article |
| id | doaj.art-ce97a8b9e4094680b32b9753d3cf29fb |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T19:25:16Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-ce97a8b9e4094680b32b9753d3cf29fb2023-11-24T03:01:21ZengMDPI AGUniverse2218-19972022-09-0181050310.3390/universe8100503Bianchi I Spacetimes in Chiral–Quintom TheoryAndronikos Paliathanasis0Institute of Systems Science, Durban University of Technology, P.O. Box 1334, Durban 4000, South AfricaIn this paper, we study anisotropic exact solutions in the homogeneous Bianchi I background geometry in a multifield theory. Specifically, we consider the Chiral–Quintom theory, which is an extension of the Chiral theory, because at least one of the scalar fields can have negative energy density. Moreover, the Quintom theory can be recovered when one of the free parameters of the theory vanishes. We find that Kasner-like and anisotropic exponential solutions exist for specific functional forms of the scalar field potential. Finally, Noether symmetry analysis is applied for the classification of the theory according to the admitted symmetries. Conservation laws are determined, while we show that the Kasner-like solution is the analytic solution for the given model.https://www.mdpi.com/2218-1997/8/10/503Bianchi spacetimesscalar fieldcosmology |
| spellingShingle | Andronikos Paliathanasis Bianchi I Spacetimes in Chiral–Quintom Theory Universe Bianchi spacetimes scalar field cosmology |
| title | Bianchi I Spacetimes in Chiral–Quintom Theory |
| title_full | Bianchi I Spacetimes in Chiral–Quintom Theory |
| title_fullStr | Bianchi I Spacetimes in Chiral–Quintom Theory |
| title_full_unstemmed | Bianchi I Spacetimes in Chiral–Quintom Theory |
| title_short | Bianchi I Spacetimes in Chiral–Quintom Theory |
| title_sort | bianchi i spacetimes in chiral quintom theory |
| topic | Bianchi spacetimes scalar field cosmology |
| url | https://www.mdpi.com/2218-1997/8/10/503 |
| work_keys_str_mv | AT andronikospaliathanasis bianchiispacetimesinchiralquintomtheory |