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2019•Monthly Notices of the Royal Astronomical SocietyOpen access

Testing dynamical vacuum models with CMB power spectrum from Planck

Pavlina Tsiapi, Spyros Basilakos

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Abstract

The cosmic expansion is computed for various dynamical vacuum models Λ(H) and confronted to the cosmic microwave background (CMB) power spectrum from Planck. We also combined CMB in a joint analysis with other probes to place constraints on the cosmological parameters of the dynamical vacuum models. We find that all Λ(H) models are very efficient and in very good agreement with the data. Considering that the interaction term of the dark sector is given in terms of matter and radiation densities we find that the corresponding Λ(H) model shows a small but non-zero deviation from Λ cosmology, nevertheless the confidence level is close to 2.5σ.

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What this paper is about

The cosmic expansion is computed for various dynamical vacuum models Λ(H) and confronted to the cosmic microwave background (CMB) power spectrum from Planck. We also combined CMB in a joint analysis with other probes to place constraints on the cosmological parameters of the dynamical vacuum models. We find that all Λ(H) models are very efficient and in very good agreement with the data. Considering that the interaction term of the dark sector is given in terms of matter and radiation densities we find that the corresponding Λ(H) model shows a small but non-zero deviation from Λ cosmology, nevertheless the confidence level is close to 2.5σ.

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Available abstract

The cosmic expansion is computed for various dynamical vacuum models Λ(H) and confronted to the cosmic microwave background (CMB) power spectrum from Planck. We also combined CMB in a joint analysis with other probes to place constraints on the cosmological parameters of the dynamical vacuum models. We find that all Λ(H) models are very efficient and in very good agreement with the data. Considering that the interaction term of the dark sector is given in terms of matter and radiation densities we find that the corresponding Λ(H) model shows a small but non-zero deviation from Λ cosmology, nevertheless the confidence level is close to 2.5σ.

Key concepts: Physics, Planck, Cosmic microwave background, Spectral density, Astrophysics, Spectrum (functional analysis), Astronomy, Theoretical physics

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