Beyond the Standard IAU Framework

TL;DR

This paper explores three potential extensions of the IAU relativistic framework, including alternative transformations, PPN formalism, and cosmological embedding, to improve precision in time and space coordinate systems.

Contribution

It introduces three novel scenarios for extending the IAU framework beyond its standard relativistic resolutions.

Findings

Proposes monopole and dipole metric transformations as alternatives.

Incorporates PPN parameters beta and gamma into the framework.

Embeds the barycentric reference system into the cosmological model.

Abstract

We discuss three conceivable scenarios of extension and/or modification of the IAU relativistic resolutions on time scales and spatial coordinates beyond the Standard IAU Framework. These scenarios include: (1) the formalism of the monopole and dipole moment transformations of the metric tensor replacing the scale transformations of time and space coordinates; (2) implementing the parameterized post-Newtonian formalism with two PPN parameters - beta and gamma; (3) embedding the post-Newtonian barycentric reference system to the Friedman-Robertson-Walker cosmological model.