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Cancelling out systematic uncertainties

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Cancelling out systematic uncertainties

dc.contributor.author	Noreña, Jorge
dc.contributor.author	Verde, Licia
dc.contributor.author	Jiménez, Raúl
dc.contributor.author	Peña Garay, Carlos
dc.contributor.author	Gómez López, César
dc.date.accessioned	2014-10-30T13:23:42Z
dc.date.available	2014-10-30T13:23:42Z
dc.date.issued	2012
dc.identifier.uri	http://hdl.handle.net/10550/39508
dc.description.abstract	We present a method to minimize, or even cancel out, the nuisance parameters affecting a measurement. Our approach is general and can be applied to any experiment or observation. We compare it with the bayesian technique used to deal with nuisance parameters: marginalization, and show how the method compares and improves by avoiding biases. We illustrate the method with several examples taken from the astrophysics and cosmology world: baryonic acoustic oscillations, cosmic clocks, Supernova Type Ia luminosity distance, neutrino oscillations and dark matter detection. By applying the method we recover some known results but also find some interesting new ones. For baryonic acoustic oscillation (BAO) experiments we show how to combine radial and angular BAO measurements in order to completely eliminate the dependence on the sound horizon at radiation drag. In the case of exploiting SN1a as standard candles we show how the uncertainty in the luminosity distance by a second parameter modeled as a metallicity dependence can be eliminated or greatly reduced. When using cosmic clocks to measure the expansion rate of the universe, we demonstrate how a particular combination of observables nearly removes the metallicity dependence of the galaxy on determining differential ages, thus removing the age-metallicity degeneracy in stellar populations. We hope that these findings will be useful in future surveys to obtain robust constraints on the dark energy equation of state.
dc.language.iso	eng
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society, 2012, vol. 419, num. 2, p. 1040-1050
dc.source	Norena, Jorge Verde, Licia Jiménez, Raúl Peña Garay, Carlos Gómez López, César 2012 Cancelling out systematic uncertainties Monthly Notices of the Royal Astronomical Society 419 2 1040 1050
dc.subject	Física
dc.title	Cancelling out systematic uncertainties
dc.type	journal article	es_ES
dc.date.updated	2014-10-30T13:23:42Z
dc.identifier.doi	http://dx.doi.org/10.1111/j.1365-2966.2011.19761.x
dc.identifier.idgrec	080415
dc.rights.accessRights	open access	es_ES