Backreaction and FRW consistency conditions

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http://hdl.handle.net/10138/308138

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Montanari , F & Räsänen , S 2017 , ' Backreaction and FRW consistency conditions ' , Journal of Cosmology and Astroparticle Physics , vol. 2017 , no. 11 , 032 . https://doi.org/10.1088/1475-7516/2017/11/032

Title: Backreaction and FRW consistency conditions
Author: Montanari, Francesco; Räsänen, Syksy
Contributor organization: Helsinki Institute of Physics
Department of Physics
Date: 2017-11
Language: eng
Number of pages: 38
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
DOI: https://doi.org/10.1088/1475-7516/2017/11/032
URI: http://hdl.handle.net/10138/308138
Abstract: If the FRW metric is a good approximation on large scales, then the distance and the expansion rate, as well different notions of distance, satisfy certain consistency conditions. We fit the JLA SNIa distance data to determine the expected amplitude of the violation of these conditions if accelerated expansion is due to backreaction. Adding cosmic clock and BAO expansion rate data, we also model-independently determine the current observational limits on such violation. We find that the predicted maximum backreaction amplitude vertical bar k(H)vertical bar less than or similar to 1 (95% C.I.) is of the same order as the current observational constraints vertical bar k(H)vertical bar less than or similar to 1, the precise numbers depending on the adopted fitting method (polynomials or splines) and stellar population evolution model. We also find that constraints on the value of Ho determined from expansion rate data are sensitive to the stellar evolution model. We forecast constraints from projected LSST+Euclid-like SNIa plus Euclid galaxy differential age data. We find improvement by factor of 6 for the backreaction case and 3 for the model-independent case, probing an interesting region of possible signatures.
Subject: cosmological parameters from LSS
dark energy experiments
gravity
supernova type Ia-standard candles
LUMINOUS RED GALAXIES
DIGITAL SKY SURVEY
BARYON ACOUSTIC-OSCILLATIONS
DATA RELEASE 7
COSMIC ACCELERATION
COSMOLOGICAL PARAMETERS
IA SUPERNOVAE
DARK ENERGY
GENERAL-RELATIVITY
EXPANSION RATE
115 Astronomy, Space science
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: acceptedVersion


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