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

G. Fanizza, M. Gasperini, G. Marozzi

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.

Keywords
observational cosmology; covariant averages of astrophysical variables; light cone gauge

Universe
Volume 9, Number 7, Page 6
2023 July

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia