Show simple item record

dc.contributor.authorMunyeshyaka, Albert
dc.contributor.authorNtahompagaze, Joseph
dc.contributor.authorMutabazi, Tom
dc.contributor.authorMbonye, Manasse.R
dc.contributor.authorAyirwanda, Abraham
dc.contributor.authorTwagirayezu, Fidele
dc.contributor.authorAbebe, Amare
dc.date.accessioned2022-10-14T07:29:42Z
dc.date.available2022-10-14T07:29:42Z
dc.date.issued2022
dc.identifier.citationMunyeshyaka, A., Ntahompagaze, J., Mutabazi, T., Mbonye, M., Ayirwanda, A., Twagirayezu, F., & Abebe, A. (2022). Perturbations in the interacting vacuum. arXiv preprint arXiv:2210.01184.en_US
dc.identifier.urihttp://ir.must.ac.ug/xmlui/handle/123456789/2547
dc.description.abstractIn 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 formalisms 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 scaling with those of _CDM 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 _CDM cosmology, both background and perturbed, is recovered.en_US
dc.language.isoen_USen_US
dc.publisherarXiven_US
dc.subjectCosmologyen_US
dc.subjectDark matteren_US
dc.subjectDark energyen_US
dc.subjectInteracting vacuumen_US
dc.subjectCosmological constanten_US
dc.subjectCovariant formalismen_US
dc.subjectCosmological perturbationsen_US
dc.titlePerturbations in the interacting vacuumen_US
dc.typeArticleen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • Research Articles [96]
    These are different research articles about different Scholars as far as physics is concerned.

Show simple item record