Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-12-04
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
9 pages, MNRAS Style, 6 eps figures
Scientific paper
We study the formation of galaxy clusters in the presence of thawing class of scalar field dark energy. We consider cases where the scalar field has canonical as well non canonical kinetic term in its action. We also consider various forms for the potential of the scalar field e.g, linear, quadratic, inverse quadratic, exponential as well as Pseudo-Nambu-Goldstone Boson (PNGB) type. Moreover we investigate situation where dark energy is homogeneous as well as situation where dark energy takes part in the virialization process. We use the Sheth-Torman formalism while calculating the number density of galaxy clusters. Our results show that cluster number density for different dark energy models have significant deviation from the corresponding value for the \Lambda CDM case. The deviation is more for higher redshifts. Moreover the tachyon type scalar field with linear potential has the highest deviation from the \Lambda CDM case. For the total cluster number counts, different dark energy models can have substantial deviation from \Lambda CDM and this deviation is most significant around $z \sim 0.5 \sim 1$ for all the models we considered.
Choudhury Tirthankar Roy
Devi Chandrachani N.
Sen Anjan A.
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