Perturbations in the interacting vacuum
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2022
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866916088806113280 |
|---|---|
| author | Munyeshyaka, Albert Ntahompagaze, Joseph Mutabazi, Tom Mbonye, Manasse. R Ayirwanda, Abraham Twagirayezu, Fidele Abebe, Amare |
| author_facet | Munyeshyaka, Albert Ntahompagaze, Joseph Mutabazi, Tom Mbonye, Manasse. R Ayirwanda, Abraham Twagirayezu, Fidele Abebe, Amare |
| contents | In this study, we present the evolution of cosmological perturbations in a universe consisting of standard matter and interacting vacuum. We use the $1 + 3$ covariant formalism in perturbation framework and consider two different models for the interacting vacuum namely a linear interacting model and interaction with creation pressure model. For both models, we derive the evolution equations governing the growth of linear perturbations for both radiation and dust dominated Universe. We find numerical solutions in appropriate limits namely long and short wavelengths. For both models, the perturbations grow with time (decay with redshift), showing that structure formation is possible in an accelerated cosmic background. The perturbation amplitudes and their relative scalings with those of standard model of cosmology depend on the values of the interaction parameters considered, and in a way that can be used to constrain the models using existing and future large scale structure data. In the vanishing limits of the coupling parameters of the interaction, we show that standard cosmology, both background and perturbed, is recovered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_01184 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Perturbations in the interacting vacuum Munyeshyaka, Albert Ntahompagaze, Joseph Mutabazi, Tom Mbonye, Manasse. R Ayirwanda, Abraham Twagirayezu, Fidele Abebe, Amare General Relativity and Quantum Cosmology In this study, we present the evolution of cosmological perturbations in a universe consisting of standard matter and interacting vacuum. We use the $1 + 3$ covariant formalism in perturbation framework and consider two different models for the interacting vacuum namely a linear interacting model and interaction with creation pressure model. For both models, we derive the evolution equations governing the growth of linear perturbations for both radiation and dust dominated Universe. We find numerical solutions in appropriate limits namely long and short wavelengths. For both models, the perturbations grow with time (decay with redshift), showing that structure formation is possible in an accelerated cosmic background. The perturbation amplitudes and their relative scalings with those of standard model of cosmology depend on the values of the interaction parameters considered, and in a way that can be used to constrain the models using existing and future large scale structure data. In the vanishing limits of the coupling parameters of the interaction, we show that standard cosmology, both background and perturbed, is recovered. |
| title | Perturbations in the interacting vacuum |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2210.01184 |