2026-06-27T22:43:36Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/125432024-09-03T16:39:53Zcom_20.500.14352_14col_20.500.14352_15

Albarran, Imanol Bouhmadi-López, Mariam Cabral, Franciso Martín Moruno, María Del Prado 2023-06-17T12:34:48Z 2023-06-17T12:34:48Z 2018-02-09 2075-4434 10.3390/galaxies6010021 https://hdl.handle.net/20.500.14352/12543 https://doi.org/10.3390/galaxies6010021 https://www.mdpi.com/2075-4434/6/1/21 We address the quantisation of a model that induces the Little Sibling of the Big Rip (LSBR) abrupt event, where the dark energy content is described by means of a phantom-like fluid or a phantom scalar field. The quantisation is done in the framework of the Wheeler–DeWitt (WDW) equation and imposing the DeWitt boundary condition; i.e., the wave function vanishes close to the abrupt event. We analyse the WDW equation within two descriptions: First, when the dark energy content is described with a perfect fluid. This leaves the problem with the scale factor as the single degree of freedom. Second, when the dark energy content is described with a phantom scalar field in such a way that an additional degree of freedom is incorporated. Here, we have applied the Born–Oppenheimer (BO) approximation in order to simplify the WDW equation. In all cases, the obtained wave function vanishes when the LSBR takes place, thus fulfilling the DeWitt boundary condition. eng https://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España The Avoidance of the Little Sibling of the Big Rip Abrupt Event by a Quantum Approach journal article