A Simple, Exact Formulation of Number Counts in the Geodesic-Light-Cone Gauge

Abstract

In this article, we compare different formulations of the number count prescription using the convenient formalism of the Geodesic-Light-Cone gauge. We then find a simple, exact, and very general expression of such a prescription which is suitable for generalised applications.

7 pages, no figures. Published in the Special Issue on "Universe: Feature Papers 2023 -- Cosmology", edited by K. Bamba (Universe, MDPI, 2023). Available at: https://www.mdpi.com/2218-1997/9/7/327

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