New Test of the Friedmann-Lemaitre-Robertson-Walker Metric Using the Distance Sum Rule

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http://hdl.handle.net/10138/310441

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Räsänen , S , Bolejko , K & Finoguenov , A 2015 , ' New Test of the Friedmann-Lemaitre-Robertson-Walker Metric Using the Distance Sum Rule ' , Physical Review Letters , vol. 115 , no. 10 , 101301 . https://doi.org/10.1103/PhysRevLett.115.101301

Title: New Test of the Friedmann-Lemaitre-Robertson-Walker Metric Using the Distance Sum Rule
Author: Räsänen, Syksy; Bolejko, Krzysztof; Finoguenov, Alexis
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2015-09-01
Language: eng
Number of pages: 5
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/310441
Abstract: We present a new test of the validity of the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric, based on comparing the distance from redshift 0 to z(1) and from z(1) to z(2) to the distance from 0 to z(2). If the Universe is described by the FLRWmetric, the comparison provides a model-independent measurement of spatial curvature. The test relies on geometrical optics, it is independent of the matter content of the Universe and the applicability of the Einstein equation on cosmological scales. We apply the test to observations, using the Union2.1 compilation of supernova distances and Sloan Lens ACS Survey galaxy strong lensing data. The FLRW metric is consistent with the data, and the spatial curvature parameter is constrained to be -1.22 <Omega(K0) <0.63, or -0.08 <Omega(K0) <0.97 with a prior from the cosmic microwave background and the local Hubble constant, though modeling of the lenses is a source of significant systematic uncertainty.
Subject: DARK-ENERGY
COSMOLOGICAL PARAMETERS
CONSTRAINTS
EVOLUTION
SAMPLE
114 Physical sciences
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