Cosmic expansion and structure formation in running vacuum cosmologies

@article{Basilakos2015CosmicEA,
  title={Cosmic expansion and structure formation in running vacuum cosmologies},
  author={Spyros Basilakos},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  year={2015}
}
  • S. Basilakos
  • Published 15 January 2015
  • Physics
  • arXiv: Cosmology and Nongalactic Astrophysics
We investigate the dynamics of the FLRW flat cosmological models in which the vacuum energy varies with redshift. A particularly well motivated model of this type is the so-called quantum field vacuum, in which both kind of terms $H^{2}$ and constant appear in the effective dark energy density affecting the evolution of the main cosmological functions at the background and perturbation levels. Specifically, it turns out that the functional form of the quantum vacuum endows the vacuum energy of… 
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References

SHOWING 1-10 OF 35 REFERENCES

Cosmic structure and dark energy

Dark energy has a dramatic effect on the dynamics of the Universe, causing the recently discovered acceleration of the expansion. The dynamics are also central to the behaviour of the growth of…

Dynamical vacuum energy in the expanding Universe confronted with observations: a dedicated study

Despite the many efforts, our theoretical understanding of the ultimate nature of the dark energy component of the universe still lags well behind the astounding experimental evidence achieved from…

Probing dark energy at galactic and cluster scales

We investigate dark matter halo properties as a function of a time-varying dark energy equation of state. The dynamics of the collapse of the halo is governed by the form of the quintessence…

Number counts and dynamical vacuum cosmologies

We study non-linear structure formation in an interacting model of the dark sector of the Universe in which the dark energy density decays linearly with the Hubble parameter, $\rho_{\Lambda} \propto…

Cluster Formation Rate in Models with Dark Energy

Based on flat Friedmann-Robertson-Walker cold dark matter (CDM) models driven by nonrelativistic matter and an exotic fluid (quintessence) with an equation of state pQ = wρQ (-1 ≤ w < 0), we…

Spherical collapse model in dark‐energy cosmologies

We study the spherical collapse model for several dark-energy scenarios using the fully non-linear differential equation for the evolution of the density contrast within homogeneous spherical…

On virialization with dark energy

We review the inclusion of dark energy in the formalism of spherical collapse, and the virialization of a two-component system, made of matter and dark energy. We compare two approaches in previous…

Spherical collapse model in time varying vacuum cosmologies

We investigate the virialization of cosmic structures in the framework of flat Friedmann-Lemaitre-Robertson-Walker cosmological models, in which the vacuum energy density evolves with time. In…

Constraining the dark energy perturbations using growth index analysis

We derive a new formulation of the growth index of matter fluctuations in the regime where the dark energy is allowed to have clustering. In particular, we find that the growth index is not only…

The mass function of dark matter haloes

We combine data from a number of N-body simulations to predict the abundance of dark haloes in cold dark matter (CDM) universes over more than four orders of magnitude in mass. A comparison of…