Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-16
Phys.Rev.D79:063523,2009
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figs, PRD submitted. (v2) typo fixed in Eq. 5. (v3) Matches version accepted for publication
Scientific paper
10.1103/PhysRevD.79.063523
Recently Eisenstein and collaborators introduced a method to `reconstruct' the linear power spectrum from a non-linearly evolved galaxy distribution in order to improve precision in measurements of baryon acoustic oscillations. We reformulate this method within the Lagrangian picture of structure formation, to better understand what such a method does, and what the resulting power spectra are. We show that reconstruction does not reproduce the linear density field, at second order. We however show that it does reduce the damping of the oscillations due to non-linear structure formation, explaining the improvements seen in simulations. Our results suggest that the reconstructed power spectrum is potentially better modeled as the sum of three different power spectra, each dominating over different wavelength ranges and with different non-linear damping terms. Finally, we also show that reconstruction reduces the mode-coupling term in the power spectrum, explaining why mis-calibrations of the acoustic scale are reduced when one considers the reconstructed power spectrum.
Cohn Joanne D.
Padmanabhan Nikhil
White Martin
No associations
LandOfFree
Reconstructing Baryon Oscillations: A Lagrangian Theory Perspective 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 Reconstructing Baryon Oscillations: A Lagrangian Theory Perspective, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconstructing Baryon Oscillations: A Lagrangian Theory Perspective will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-226155