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We derive an analytic expression for the two-point correlation function inredshift space which (i) is nonlinear; (ii) is valid on the full sky, i.e. thedistant-observer limit is not assumed; (iii) can account for the effect ofmagnification and evolution bias due to a non-uniform selection function; and(iv) respects the fact that observations are made on the past lightcone, sonaturally yields unequal-time correlations. Our model is based on an exacttreatment of the streaming model in the wide-angle regime. Within this generalregime, we find that the redshift-space correlation function is essentiallydetermined by a geometric average of its real-space counterpart. We show thatthe linear expression for the galaxy overdensity, accurate to subleading order,can be recovered from our nonlinear framework. This work is particularlyrelevant for the modeling of odd multipoles of the correlation function atsmall separations and low redshifts, where wide-angle effects, selectioneffects, and nonlinearities are expected to be equally important.

Nonlinear Redshift-Space Distortions on the Full Sky