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

2001/01/31 by Max Tegmark · 2 citations
Physics and Astronomy · #Astronomy #Astrophysics #COSMIC cancer database #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Gravitational lens #Metric (unit) #Metric expansion of space #Perturbation (astronomy) #Physics #Quantum mechanics #Redshift #Supernova #Theoretical physics #Weak gravitational lensing #astro-ph #gr-qc #hep-ph

paper · pdf · doi:10.1103/physrevd.66.103507

published as Phys.Rev.D66:103507,2002 · Replaced to match accepted PRD version. References and another example added, section III omitted since superceded by astro-ph/0207047. 11 PRD pages, 7 figs. Color figs and links at http://www.hep.upenn.edu/~max/gravity.html or from [email protected]

arxiv created 2002/09/17 · openalex publication_date 2002/11/25 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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 Ly\ensuremathα forest observations can be combined to pursue this program, and forecast the accuracy that the proposed SNAP satellite can attain.

Citations

• First Estimations of Cosmological Parameters From BOOMERANG
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• How to determine an effective potential for a variable cosmological term
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• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
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• Constraining the equation of state of the Universe from distant Type Ia supernovae and cosmic microwave background anisotropies
• The Case for a Positive Cosmological Lambda-term

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