Measuring the metric: A parametrized post-Friedmannian approach to the cosmic dark energy problem

Max Tegmark
Phys. Rev. D 66, 103507 – Published 25 November 2002
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Abstract

We argue for a “parametrized post-Friedmannian” approach to linear cosmology, where the history of expansion and perturbation growth is measured without assuming that the Einstein field equations hold. As an illustration, a model-independent analysis of 92 type Ia supernovae demonstrates that the curve giving the expansion history has the wrong shape to be explained without some form of dark energy or modified gravity. We discuss how upcoming lensing, galaxy clustering, cosmic microwave background and Lyα forest observations can be combined to pursue this program, and forecast the accuracy that the proposed SNAP satellite can attain.

  • Received 23 January 2001

DOI:https://doi.org/10.1103/PhysRevD.66.103507

©2002 American Physical Society

Authors & Affiliations

Max Tegmark*

  • Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104

  • *Email address: max@physics.upenn.edu

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Issue

Vol. 66, Iss. 10 — 15 November 2002

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