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http://hdl.handle.net/2445/180421
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DC Field | Value | Language |
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dc.contributor.advisor | Solà Peracaula, Joan | - |
dc.contributor.author | Sánchez Alcalde, Guillem | - |
dc.date.accessioned | 2021-10-05T16:45:28Z | - |
dc.date.available | 2021-10-05T16:45:28Z | - |
dc.date.issued | 2021-02 | - |
dc.identifier.uri | http://hdl.handle.net/2445/180421 | - |
dc.description | Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutor: Joan Solà Peracaula | ca |
dc.description.abstract | We consider the possibility of a universe whose dark energy (DE) is made out of a negative cosmological constant Λ and a dynamical component X, dubbed as ”cosmon”, which does not interact with Λ. Due to Λ < 0, the late-time accelerated expansion rate is caused by X. In this paper, the study of this framework has been performed by implementing a piece-wise function for the equation of state (EoS) parameter of the cosmon. This parametrization provides an analysis of the impact on the total DE behaviour when a transition from phantom-like to quintessence cosmon (or vice versa) takes place. It has been found that a stopping point in the Universe is displayed in the future when a transition of X from phantom-like to quintessence occurs. For such transition, the ratio of the DE density to matter density (ρD/ρm) is bounded, giving a possible solution to the cosmological coincidence problem. Furthermore, for a phantom-like cosmon at present, we can obtain values of the Hubble constant (H0) compatible with the ones acquired experimentally for cosmic microwave background data [1] and local data [2]. | ca |
dc.format.extent | 5 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | ca |
dc.rights | cc-by-nc-nd (c) Sánchez, 2021 | - |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ | * |
dc.source | Treballs Finals de Grau (TFG) - Física | - |
dc.subject.classification | Energia fosca (Astronomia) | cat |
dc.subject.classification | Tensió de Hubble | cat |
dc.subject.classification | Treballs de fi de grau | cat |
dc.subject.other | Dark energy (Astronomy) | eng |
dc.subject.other | Hubble tension | eng |
dc.subject.other | Bachelor's theses | eng |
dc.title | Bouncing universes and dark energy | eng |
dc.type | info:eu-repo/semantics/bachelorThesis | ca |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca |
Appears in Collections: | Treballs Finals de Grau (TFG) - Física |
Files in This Item:
File | Description | Size | Format | |
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SÁNCHEZ ALCALDE GUILLEM_3085501_assignsubmission_file_TFG-Sánchez-Alcalde-Guillem.pdf | 617.05 kB | Adobe PDF | View/Open |
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