Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933602l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #336.02
Astronomy and Astrophysics
Astronomy
Scientific paper
We show a purely geometrical method for probing the expansion history of the Universe from the observation of the shape of stacked voids in spectroscopic redshift surveys. This method is an Alcock-Pasczynski test based on the average sphericity of voids posited on the local isotropy of the Universe, which acts as rulers of unknown size. We describe the algorithm that we use to detect and stack voids in redshift shells on the light cone. We establish, and test on N-body simulation, a robust statistical model for estimating the average stretching of voids in redshift space. Finally, we discuss the constraining power on dark energy parameters in terms of the figure of merit of the Dark Energy Task Force. We estimate the figure of merit for SDSS, BOSS and EUCLID class surveys. For Euclid, the figure of merit is an order of magnitude higher than Baryonic Acoustic Oscillation based methods.
We acknowledge financial support from NSF Grant AST 07-08849, AST 09-08693 and from BDW's Chaire d'Excellence granted by the Agence Nationale de Recherche. GL acknowledges support from CITA National Fellowship and financial support from the Government of Canada Post-Doctoral Research Fellowship.
Lavaux Guilhem
Wandelt Benjamin D.
No associations
LandOfFree
Cosmic Voids As Standard Rulers For Cosmology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cosmic Voids As Standard Rulers For Cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic Voids As Standard Rulers For Cosmology will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1580697