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A cosmological concordance model with dynamical vacuum term

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arxiv 1201.5919 v2 pith:V37NRW6N submitted 2012-01-28 astro-ph.CO gr-qchep-th

J. S. Alcaniz , H. A. Borges , S. Carneiro , J. C. Fabris , C. Pigozzo , W. Zimdahl This is my paper · ORCID
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keywords cosmologicalmodelacousticanisotropyconcordancecosmichubblerate
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We demonstrate that creation of dark-matter particles at a constant rate implies the existence of a cosmological term that decays linearly with the Hubble rate. We discuss the cosmological model that arises in this context and test it against observations of the first acoustic peak in the cosmic microwave background (CMB) anisotropy spectrum, the Hubble diagram for supernovas of type Ia (SNIa), the distance scale of baryonic acoustic oscillations (BAO) and the distribution of large scale structures (LSS). We show that a good concordance is obtained, albeit with a higher value of the present matter abundance than in the \Lambda CDM model. We also comment on general features of the CMB anisotropy spectrum and on the cosmic coincidence problem.

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  1. The frozen vanilla model: Exploring dark sector interactions with delta effective theories

    gr-qc 2025-04 conditional novelty 6.0 of 10

    A dark sector interaction that acts only on perturbations leaves the background expansion untouched while changing the integrated Sachs-Wolfe effect, matter clustering, fσ8, and S8 predictions.

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