A forecast for the detection of the power asymmetry from galaxy surveys

Understand

We investigate the possibility of detecting in redshift surveys a hemispherical power asymmetry similar to that first reported in CMB observations.

• We assume the hemispherical asymmetry arises from a linear gradient in comoving coordinates in the perturbation amplitude.
• We predict the resulting clustering of galaxy or galaxy cluster tracers using an excursion set approach; doing so accounts for the variation of both the underlying clustering and the tracer bias.
• Based on the predicted variation of the clustering of tracers, we perform a Fisher matrix forecast of the galaxy clustering amplitude and calculate the statistical significance for ideal surveys and planned surveys.