Observed Angles and Geodesic Light-Cone Coordinates
General Relativity and Quantum Cosmology
2018-04-18 v2
Abstract
We discuss the interpretation of the angles in the Geodesic Light-Cone (GLC) coordinates. In particular, we clarify the way in which these angles can be identified with the observed ones. We show that, although this identification is always possible in principle, one cannot implement it in the usual gauge-fixing way, i.e. through a set of conditions on the GLC metric. Rather, one needs to invoke a tetrad at the observer and a Cartesian-like coordinate system in order to obtain the desired map globally on the observed sky.
Cite
@article{arxiv.1712.05675,
title = {Observed Angles and Geodesic Light-Cone Coordinates},
author = {Ermis Mitsou and Fulvio Scaccabarozzi and Giuseppe Fanizza},
journal= {arXiv preprint arXiv:1712.05675},
year = {2018}
}
Comments
6 pages, final version accepted for publication in Classical and Quantum Gravity