Reconstruction of dark energy and expansion dynamics using Gaussian processes

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dc.contributor.authorSeikel, Marina
dc.contributor.authorClarkson, Chris
dc.date.accessioned2023-06-06T07:43:13Z
dc.date.available2023-06-06T07:43:13Z
dc.date.issued2012
dc.description.abstractAn important issue in cosmology is reconstructing the effective dark energy equation of state directly from observations. With few physically motivated models, future dark energy studies cannot only be based on constraining a dark energy parameter space, as the errors found depend strongly on the parametrisation considered. We present a new non-parametric approach to reconstructing the history of the expansion rate and dark energy using Gaussian Processes, which is a fully Bayesian approach for smoothing data. We present a pedagogical introduction to Gaussian Processes, and discuss how it can be used to robustly differentiate data in a suitable way. Using this method we show that the Dark Energy Survey - Supernova Survey (DES) can accurately recover a slowly evolving equation of state to w = ±0.05 (95% CL) at z = 0 and ±0.25 at z = 0.7, with a minimum error of ±0.025 at the sweet-spot at z 0.16, provided the other parameters of the model are known. Errors on the expansion history are an order of magnitude smaller, yet make no assumptions about dark energy whatsoever.en_US
dc.identifier.citationSeikel, M., & Clarkson, C. (2012). Reconstruction of dark energy and expansion dynamics using Gaussian processes. Journal of Cosmology and Astroparticle Physics. 6. 10.1088/1475-7516/2012/06/036en_US
dc.identifier.issn1475-7516
dc.identifier.uri10.1088/1475-7516/2012/06/036
dc.identifier.urihttp://hdl.handle.net/10566/9025
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.subjectPhysicsen_US
dc.subjectDark energyen_US
dc.subjectCosmologyen_US
dc.subjectAstronomyen_US
dc.subjectGaussian processesen_US
dc.titleReconstruction of dark energy and expansion dynamics using Gaussian processesen_US
dc.typeArticleen_US

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