Speaker
Description
The distortions in the galaxy number count introduced by perturbations in the spacetime can be measured by the Fourier power spectrum and bispectrum. The study of these spectra often uses the distant observer approximation where the line-of-sight (LOS) vectors are always parallel. But, it has been shown that going beyond this plane-parallel assumption introduces wide-angle corrections to the power spectrum and bispectrum. For the bisector LOS definition, the wide-angle effects are non-negligible and can potentially contaminate local f_{NL} measurements. In this work, we generalize the results, both in the single and multi-tracer cases, for all possible LOS definitions that can be parameterized by a free parameter in the power spectrum. We focus on low redshifts where the wide-angle effects are larger and therefore, we can safely neglect the lensing contribution. We consider the non-integrated redshift-space distortions and relativistic Doppler and Sachs-Wolfe terms in our perturbative expansion of the wide-angle corrections and include the primordial non-Gaussianity through the bias tracers.
