Fermionic cosmologies
In this work we review if fermionic sources could be responsible for accelerated periods during the evolution of a FRW universe. In a first attempt, besides the fermionic source, a matter constituent would answer for the decelerated periods. The coupled differential equations that emerge from the fi...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17426588_v306_n1_p_Chimento http://hdl.handle.net/20.500.12110/paper_17426588_v306_n1_p_Chimento |
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paper:paper_17426588_v306_n1_p_Chimento2023-06-08T16:27:18Z Fermionic cosmologies Differential equations Quantum theory Analytical results Cosmological models Coupled differential equations Early universe Field equation Form invariance Scalar invariants Self-interactions Cosmology In this work we review if fermionic sources could be responsible for accelerated periods during the evolution of a FRW universe. In a first attempt, besides the fermionic source, a matter constituent would answer for the decelerated periods. The coupled differential equations that emerge from the field equations are integrated numerically. The self-interaction potential of the fermionic field is considered as a function of the scalar and pseudo-scalar invariants. It is shown that the fermionic field could behave like an inflaton field in the early universe, giving place to a transition to a matter dominated (decelerated) period. In a second formulation we turn our attention to analytical results, specifically using the idea of form-invariance transformations. These transformations can be used for obtaining accelerated cosmologies starting with conventional cosmological models. Here we reconsider the scalar field case and extend the discussion to fermionic fields. Finally we investigate the role of a Dirac field in a Brans-Dicke (BD) context. The results show that this source, in combination with the BD scalar, promote a final eternal accelerated era, after a matter dominated period. © Published under licence by IOP Publishing Ltd. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17426588_v306_n1_p_Chimento http://hdl.handle.net/20.500.12110/paper_17426588_v306_n1_p_Chimento |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Differential equations Quantum theory Analytical results Cosmological models Coupled differential equations Early universe Field equation Form invariance Scalar invariants Self-interactions Cosmology |
| spellingShingle |
Differential equations Quantum theory Analytical results Cosmological models Coupled differential equations Early universe Field equation Form invariance Scalar invariants Self-interactions Cosmology Fermionic cosmologies |
| topic_facet |
Differential equations Quantum theory Analytical results Cosmological models Coupled differential equations Early universe Field equation Form invariance Scalar invariants Self-interactions Cosmology |
| description |
In this work we review if fermionic sources could be responsible for accelerated periods during the evolution of a FRW universe. In a first attempt, besides the fermionic source, a matter constituent would answer for the decelerated periods. The coupled differential equations that emerge from the field equations are integrated numerically. The self-interaction potential of the fermionic field is considered as a function of the scalar and pseudo-scalar invariants. It is shown that the fermionic field could behave like an inflaton field in the early universe, giving place to a transition to a matter dominated (decelerated) period. In a second formulation we turn our attention to analytical results, specifically using the idea of form-invariance transformations. These transformations can be used for obtaining accelerated cosmologies starting with conventional cosmological models. Here we reconsider the scalar field case and extend the discussion to fermionic fields. Finally we investigate the role of a Dirac field in a Brans-Dicke (BD) context. The results show that this source, in combination with the BD scalar, promote a final eternal accelerated era, after a matter dominated period. © Published under licence by IOP Publishing Ltd. |
| title |
Fermionic cosmologies |
| title_short |
Fermionic cosmologies |
| title_full |
Fermionic cosmologies |
| title_fullStr |
Fermionic cosmologies |
| title_full_unstemmed |
Fermionic cosmologies |
| title_sort |
fermionic cosmologies |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17426588_v306_n1_p_Chimento http://hdl.handle.net/20.500.12110/paper_17426588_v306_n1_p_Chimento |
| _version_ |
1768543677035053056 |