Can decaying vacuum elucidate the late-time dynamics of the Universe?

الأصل · EN

We examine the decay vacuum model with a parameter ε that indicates the vacuum energy decay rate. By constraining this model with cosmic microwave background radiation, baryon acoustic oscillation, type Ia supernovae and 30 H(z) cosmic chronometer data points, we find that ε=-0.0003±0.00024 with the best fitted χ² value slightly smaller than that in the ΛCDM model. A negative value of ε suggesting dark matter energy decay into vacuum energy. We also obtain the Hubble constant H₀=68.05±0.56 that can alleviate the current H₀ tension between the local observation by the Hubble Space Telescope and the global measurement by the Planck Satellite. Using the effective equation of state formalism, we find this model is quintessence-like.