Beyond Cosmological Parameters

1 January 2003

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 666 (1) , 19-32
https://doi.org/10.1063/1.1581768

Abstract

Observational constraints on spacetime from supernovae Ia, CMB, lensing, Lyman α Forest and galaxy clustering are reviewed, focusing on how the underlying physics (dark matter, dark energy, gravity) can be tested rather than assumed. This is possible because we are simply measuring spacetime, and to 1st order, all observations probe just three cosmological functions, not a dozen dubious cosmological parameters: the cosmic expansion history H(z), the primordial power spectrum P * (k) and the fluctuation growth g(z, k). Measuring these functions will clarify the nature of dark energy (from how its density depends on time), the nature of dark matter (from its power spectrum growth) and the nature of early universe (from the primordial power spectrum).

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