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ORIGINS Lensing Day

November 14, 2024
MIAPbP@ORIGINS
Europe/Berlin timezone

Conor O'Riordan

Session

Morning session 2

Nov 14, 2024, 11:00 AM
MIAPbP Seminar Room (MIAPbP@ORIGINS)

MIAPbP Seminar Room

MIAPbP@ORIGINS

https://www.munich-iapbp.de/contact

Conveners

Morning session 2

  • Leon Roman Ecker (LMU Munich (USM)/ Max-Planck Institute for extraterrestrial physics (MPE))

Description

Weak lensing and radio lens finding

Presentation materials

There are no materials yet.

  1. 19. Cosmological Constraints with Weak Lensing Scattering Transform
    Sijin Chen (LMU Munich)
    11/14/24, 11:00 AM
    Contributed talk

    CMB observations show that early density fluctuations were nearly Gaussian. The gravitational evolution of matter formed large structures, and nonlinear evolution introduced non-Gaussianity, making it challenging to analyze. In this project, we employ the scattering transform, a powerful statistical tool that shares ideas with convolutional neural networks (CNNs) but requires no training or...

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  2. 15. Higher-order WL Statistics and Intrinsic Alignment
    Mehar Chawla
    11/14/24, 11:20 AM
    Contributed talk

    Higher-order WL statistics can capture the non-Gaussian nature of the Cosmic Web and exploit that to offer stricter constraints on Cosmological/MG parameters. In this talk I will start by elaborating on the significance and advantages of looking into these higher-order statistics.

    There are certain known systematic errors (like galaxy Intrinsic Alignment) that exist in WL data, which need...

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  3. 8. Cosmology with weak lensing peaks and voids
    Chris Davies (USM LMU)
    11/14/24, 11:40 AM
    Contributed talk

    Maximising the information that can be extracted from weak lensing measurements is a key goal for LSST and Euclid. This is typically achieved through statistics that are complementary to the cosmic shear two-point correlation function.

    In this talk I will present the development of two such complementary statistics.

    The first is weak lensing peaks. Typically, only the peak abundance is...

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  4. 12. Watershed on the curved sky
    Xu Han (LMU Munich)
    11/14/24, 12:00 PM
    Contributed talk

    Cosmic voids are vast underdense regions in the universe that offer unique insights into dark energy and the large-scale structure of the cosmos. This talk presents a novel method for identifying voids in weak lensing convergence maps using a 2D watershed algorithm. By analyzing data from the CosmoGridV1 simulation and the Dark Energy Survey (DES), we demonstrate the algorithm's capability to...

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  5. 22. Finding lenses with LOFAR: A case study
    Willem de Roo
    11/14/24, 12:20 PM
    Contributed talk

    The International LOFAR Telescope (ILT) is currently observing the entire northern sky at a resolution of 0.3 arcsec as part of the LOFAR Two-metre Sky Survey (LoTSS). Its large survey area and high resolution combined with steep number counts towards low frequencies make the ILT well suited for finding galaxy-scale lenses, but the inherent complexity of radio source morphologies make the...

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