Weak lensing cosmology with convolutional neural networks on noisy data
نویسندگان
چکیده
منابع مشابه
Cosmology with weak lensing surveys.
Weak gravitational lensing is responsible for the shearing and magnification of the images of high-redshift sources due to the presence of intervening mass. Since the lensing effects arise from deflections of the light rays due to fluctuations of the gravitational potential, they can be directly related to the underlying density field of the large-scale structures. Weak gravitational surveys ar...
متن کاملWeak lensing and cosmology
Recently, it has been shown that it is possible to reconstruct the projected mass distribution of a cluster from weak lensing provided that both the geometry of the universe and the probability distribution of galaxy redshifts are known; actually, when additional photometric data are taken to be available, the galaxy redshift distribution could be determined jointly with the cluster mass from t...
متن کاملWeak Lensing and Cosmology
We explore the dependence of weak lensing phenomena on the background cosmology. We rst generalise the relation between P (!), the angular power spectrum of the distortion, and the power spectrum of density uctuations to nonat cosmologies. We then compute P for various illustrative models. A useful cosmological discriminator is the growth of P with source redshift which is much stronger in low ...
متن کاملDeep Convolutional Neural Networks and Noisy Images
The presence of noise represent a relevant issue in image feature extraction and classification. In deep learning, representation is learned directly from the data and, therefore, the classification model is influenced by the quality of the input. However, the ability of deep convolutional neural networks to deal with images that have a different quality when compare to those used to train the ...
متن کاملCosmology from Cluster Sz and Weak Lensing Data
Weak gravitational lensing and the Sunyaev-Zel’dovich effect provide complementary information on the composition of clusters of galaxies. Preliminary results from cluster SZ observations with the Very Small Array are presented. A Bayesian approach to combining this data with wide field lensing data is then outlined; this allows the relative probabilities of cluster models of varying complexity...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2019
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stz2610