Dynamics of Void and its Shape in Redshift Space

Details Dynamics of Void and its Shape in Redshift Space Dynamics of Void and its Shape in Redshift Space

2011-03-10

arxiv.org/abs/1103.2007v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

19 pages, 11 figures

Scientific paper

We investigate the dynamics of a single spherical void embedded in a Friedmann-Lema\^itre universe, and analyze the void shape in the redshift space. We find that the void in the redshift space appears as an ellipse shape elongated in the direction of the line of sight (i.e., an opposite deformation to the Kaiser effect). Applying this result to observed void candidates at the redshift z~1-2, it may provide us with a new method to evaluate the cosmological parameters, in particular the value of a cosmological constant.

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