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- W2056674443 abstract "We investigate the properties of the FLRW flat cosmological models in which the vacuum energy density evolves with time, $Lambda(t)$. Using different versions of the $Lambda(t)$ model, namely quantum field vacuum, power series vacuum and power law vacuum, we find that the main cosmological functions such as the scale factor of the universe, the Hubble expansion rate $H$ and the energy densities are defined analytically. Performing a joint likelihood analysis of the recent supernovae type Ia data, the Cosmic Microwave Background (CMB) shift parameter and the Baryonic Acoustic Oscillations (BAOs) traced by the Sloan Digital Sky Survey (SDSS) galaxies, we put tight constraints on the main cosmological parameters of the $Lambda(t)$ scenarios. Furthermore, we study the linear matter fluctuation field and the growth rate of clustering of the above vacuum models. Finally, we derived the theoretically predicted dark-matter halo mass function and the corresponding distribution of cluster-size halos for all the models studied. Their expected redshift distribution indicates that it will be difficult to distinguish the closely resembling models (constant vacuum, quantum field and power-law vacuum), using realistic future X-ray surveys of cluster abundances. However, cluster surveys based on the Sunayev-Zeldovich detection method give some hope to distinguish the closely resembling models at high redshifts." @default.
- W2056674443 created "2016-06-24" @default.
- W2056674443 creator A5008017000 @default.
- W2056674443 creator A5032969281 @default.
- W2056674443 creator A5085403901 @default.
- W2056674443 date "2009-10-08" @default.
- W2056674443 modified "2023-09-27" @default.
- W2056674443 title "Hubble expansion and structure formation in time varying vacuum models" @default.
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