Lensing and time-delay contributions to galaxy correlations

Understand

Galaxy clustering on very large scales can be probed via the 2-point correlation function in the general case of wide and deep separations, including all the lightcone and relativistic effects.

• Using our recently developed formalism, we analyze the behavior of the local and integrated contributions and how these depend on redshift range, linear and angular separations and luminosity function.
• Relativistic corrections to the local part of the correlation can be non-negligible but they remain generally sub-dominant.
• On the other hand, the additional correlations arising from lensing convergence and time-delay effects can become very important and even dominate the observed total correlation function.