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RESEARCH PRODUCT
A new stochastic approach to cumulative weak lensing
Valerio MarraKimmo Kainulainensubject
PhysicsNuclear and High Energy PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsmedia_common.quotation_subjectDark matterFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesUniverseGeneral Relativity and Quantum CosmologyRed shiftStochastic distributionDistribution (mathematics)Distribution functionObservational cosmologyQuantum mechanics0103 physical sciences010303 astronomy & astrophysicsWeak gravitational lensingMathematical physicsmedia_commonAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
We study the weak gravitational lensing effects caused by a stochastic distribution of dark matter halos. We develop a simple approach to calculate the magnification probability distribution function which allows us to easily compute the magnitude bias and dispersion for an arbitrary data sample and a given universe model. As an application we consider the effects of single-mass large-scale cosmic inhomogeneities to the SNe magnitude-redshift relation, and conclude that such structures could bias the PDF enough to affect the extraction of cosmological parameters from the limited size of present-day SNe data samples. We also release turboGL, a simple and very fast (<= 1s) Mathematica code based on the method here presented.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-09-04 |