General Relativity and Gravitation

, Volume 37, Issue 9, pp 1541–1548 | Cite as

Cosmography: Cosmology without the Einstein equations

Research Article

Abstract

How much of modern cosmology is really cosmography? How much of modern cosmology is independent of the Einstein equations? (Independent of the Friedmann equations?) These questions are becoming increasingly germane—as the models cosmologists use for the stress-energy content of the universe become increasingly baroque, it behaves us to step back a little and carefully disentangle cosmological kinematics from cosmological dynamics. The use of basic symmetry principles (such as the cosmological principle) permits us to do a considerable amount, without ever having to address the vexatious issues of just how much “dark energy”, “dark matter”, “quintessence”, and/or “phantom matter” is needed in order to satisfy the Einstein equations. This is the sub-sector of cosmology that Weinberg refers to as “cosmography”, and in this article I will explore the extent to which cosmography is sufficient for analyzing the Hubble law and so describing many of the features of the universe around us.

Cosmology Cosmography 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.School of Mathematics, Statistics, and Computer ScienceVictoria University of WellingtonWellingtonNew Zealand

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