We present the cosmological distance errors achievable using the
baryonic acoustic oscillations as a standard ruler. We begin from a
Fisher matrix formalism that is upgraded from Seo and Eisenstein (2003).
We isolate the information from the baryonic peaks by excluding distance
information from other less robust sources. Meanwhile, we accommodate the
Lagrangian displacement distribution into the Fisher matrix calculation
to reflect the gradual loss of information in scale and in time due to
nonlinear growth, nonlinear bias, and nonlinear redshift distortions.
We then show that we can contract the multi-dimensional fisher matrix
calculations into a 2-dimensional or even 1-dimensional formalism with
physically motivated approximations. We present the resulting fitting
formula for the cosmological distance errors from galaxy redshift surveys
as a function of survey parameters and nonlinearity, which saves us
going through the 12-dimensional Fisher matrix calculations. Finally,
we show excellent agreement between the error estimates from the revised
Fisher matrix and the precision on the distance scale recovered from
The paper itself
(submitted to the Astrophysical Journal).
A code in C implementing the fitting formula is posted here.
The comments in the code explain the use.
The paper itself (submitted to the Astrophysical Journal).
A code in C implementing the fitting formula is posted here. The comments in the code explain the use.