Precision cosmology with voids: definition, methods, dynamics
- Creators
- Lavaux, Guilhem
- Wandelt, Benjamin D.
Abstract
We propose a new definition of cosmic voids based on methods of Lagrangian orbit reconstruction as well as an algorithm to find them in actual data called DynamIcal Void Analysis. Our technique is intended to yield results which can be modelled sufficiently accurately to create a new probe of precision cosmology. We then develop an analytical model of the ellipticity of voids found by our method based on the Zel'dovich approximation. We measure in N-body simulation that this model is precise at the ~0.1 per cent level for the mean ellipticity of voids of size greater than ~4 h ^(−1) Mpc. We estimate that at this scale we are able to predict the ellipticity with an accuracy of σ_ε ~ 0.02. Finally, we compare the distribution of void shapes in N-body simulation for two different equations of state w of the dark energy. We conclude that our method is far more accurate than Eulerian methods and is therefore promising as a precision probe of dark energy phenomenology.
Additional Information
© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2009 December 9. Received 2009 December 9; in original form 2009 June 19. Published Online: 29 Jan 2010. This research was supported in part by the National Science Foundation through TeraGrid resources provided by the NCSA. TeraGrid systems are hosted by Indiana University, LONI, NCAR, NCSA, NICS, ORNL, PSC, Purdue University, SDSC, TACC and UC/ANL. The authors acknowledge financial support from NSF grant AST 07-08849. We acknowledge the hospitality of the California Institute of Technology, where the authors completed most of this work. We thank the referee, Rien van de Weygaert, for his useful comments and suggestions.Attached Files
Published - Lavaux2010p9897Mon_Not_R_Astron_Soc.pdf
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Additional details
- Eprint ID
- 18596
- Resolver ID
- CaltechAUTHORS:20100608-080035442
- AST-07-08849
- NSF
- Created
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2010-06-08Created from EPrint's datestamp field
- Updated
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2023-02-27Created from EPrint's last_modified field