Search results for "Cosmology: theory"

showing 3 items of 3 documents

Euclid preparation XIX. Impact of magnification on photometric galaxy clustering

2022

Aims. We investigate the importance of lensing magnification for estimates of galaxy clustering and its cross-correlation with shear for the photometric sample of Euclid. Using updated specifications, we study the impact of lensing magnification on the constraints and the shift in the estimation of the best fitting cosmological parameters that we expect if this effect is neglected.

Cosmology and Nongalactic Astrophysics (astro-ph.CO)FOS: Physical sciencesAstrophysics::Cosmology and Extragalactic Astrophysicsshearkosmologiapower spectragalaksijoukotredshift-space distortionscosmology: theorycosmological parameterstheorydark energyAstrophysics::Galaxy Astrophysicstheory large-scale structure of Universe [cosmological parameters cosmology]theory [cosmology]massive neutrinosunified pipelineAstronomy and Astrophysics115 Astronomy Space scienceangular cross-correlationshalo-modelSpace and Planetary Science[SDU]Sciences of the Universe [physics]fotometriacosmological parametercosmic magnificationlarge-scale structure of UniversecosmologydipoleAstrophysics - Cosmology and Nongalactic Astrophysics
researchProduct

Simulation-based marginal likelihood for cluster strong lensing cosmology

2015

Comparisons between observed and predicted strong lensing properties of galaxy clusters have been routinely used to claim either tension or consistency with $\Lambda$CDM cosmology. However, standard approaches to such cosmological tests are unable to quantify the preference for one cosmology over another. We advocate approximating the relevant Bayes factor using a marginal likelihood that is based on the following summary statistic: the posterior probability distribution function for the parameters of the scaling relation between Einstein radii and cluster mass, $\alpha$ and $\beta$. We demonstrate, for the first time, a method of estimating the marginal likelihood using the X-ray selected …

FOS: Computer and information sciencesSTATISTICAL [METHODS]Cold dark matterCosmology and Nongalactic Astrophysics (astro-ph.CO)NUMERICAL [METHODS]Ciencias FísicasPosterior probabilityFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesStatistics - ApplicationsCosmologymethods: numerical//purl.org/becyt/ford/1 [https]cosmology: theory0103 physical sciencesCluster (physics)Applications (stat.AP)Statistical physics010303 astronomy & astrophysicsInstrumentation and Methods for Astrophysics (astro-ph.IM)Galaxy clusterPhysicsmethods: statisticalgravitational lensing: strong; methods: numerical; methods: statistical; galaxies: clusters: general; cosmology: theory010308 nuclear & particles physicsgravitational lensing: strongAstronomy and AstrophysicsBayes factor//purl.org/becyt/ford/1.3 [https]STRONG [GRAVITATIONAL LENSING]RedshiftMarginal likelihoodAstronomíaTHEORY [COSMOLOGY]Space and Planetary Sciencegalaxies: clusters: generalPhysics - Data Analysis Statistics and ProbabilityCLUSTERS: GENERAL [GALAXIES]Astrophysics - Instrumentation and Methods for AstrophysicsData Analysis Statistics and Probability (physics.data-an)CIENCIAS NATURALES Y EXACTASAstrophysics - Cosmology and Nongalactic Astrophysics
researchProduct

On the estimation and detection of the Rees Sciama effect

2017

Maps of the Rees–Sciama (RS) effect are simulated using the parallel N-body code, hydra, and a run-time ray-tracing procedure. A method designed for the analysis of small, square cosmic microwave background (CMB) maps is applied to our RS maps. Each of these techniques has been tested and successfully applied in previous papers. Within a range of angular scales, our estimate of the RS angular power spectrum due to variations in the peculiar gravitational potential on scales smaller than 42/h megaparsecs is shown to be robust. An exhaustive study of the redshifts and spatial scales relevant for the production of RS anisotropy is developed for the first time. Results from this study demonstra…

PhysicsEstimationnumerical [Methods]Methods: numericalLarge-scale structure of Universe010308 nuclear & particles physicsCosmic background radiationAstronomy and AstrophysicsAstrophysicsCosmic background radiation01 natural sciencesSpace and Planetary Sciencetheory [Cosmology]0103 physical sciencesCosmology: theoryMATEMATICA APLICADA010303 astronomy & astrophysics
researchProduct