Cosmic Cartography 2022: Exploring the Cosmic Web and Large-Scale Structure

Session

Day 4 Afternoon

4.2

10 Mar 2022, 14:00

Lecture Hall (Kavli IPMU, Kashiwa, Japan)

50. Constrained Simulations of COSMOS galaxy protoclusters at high redshifts

Metin Ata (Kavli IPMU)

10/03/2022, 14:00

Constrained cosmological simulations, are designed to match the observed distribution of galaxies. Here, we present constrained simulations based on spectroscopic surveys at a redshift of z ∼ 2.3, corresponding to an epoch nearly 11 Gyrs ago. This allows us to “fast-forward” the simulation to our present day and study the evolution of observed cosmic structures self-consistently. Our...

51. The Void-Galaxy Cross-Correlation Function In Future Large Scale Structure Surveys

Sladana Radinovic (Institute of Theoretical Astrophysics, University of Oslo)

10/03/2022, 14:30

Cosmic voids are vast underdense regions of space in the large scale structure, whose statistical properties we've only recently been able to fully utilize. In particular, the cross-correlation of voids with galaxies allows us to explore redshift-space distortions and use the Alcock-Paczynski effect to constrain the laws of gravity and the expansion history of the Universe. In my talk I will...

52. Cluster and Void abundance as a probe of the non-linear Universe

Stephen Stopyra

10/03/2022, 14:50

A key limitation in advancing cosmology is the poor understanding of structure formation in non-linear regimes. Much information is contained at small scales, where low-redshift power spectra are difficult to model; as we move into an era of high-volume data to reduce statistical errors, modelling uncertainties such as this will become increasingly important. In this talk, I will first show...

53. How do voids influence galaxy evolution?

Marius Peper (Nicolaus Copernicus University)

10/03/2022, 15:10

In our work (arXiv:2010.03742), we investigate the influence of voids on galaxy formation. In contrast to the dense environment of galaxy clusters, a galaxy should have difficulty forming in the underdense environment of a cosmic void. The gravitational pull of the void's surroundings should weaken the matter infall onto a dark matter halo located in the void. The effect should be the...

54. Hierarchical structure of voids

Mariana Jaber

10/03/2022, 15:45

Voids possess a very complex internal structure and dynamics. Our work studies the hierarchical structure present in the cosmic web identified on a set of numerical simulations. We use the SpineWeb method, which provides a complete framework for the characterization of the cosmic web into its primary constituents: voids, walls, filaments and clusters. We aim to characterize the inner...

55. LyAl-Net: A high-efficiency Lyman-α forest simulation with neural network

Chotipan Boonkongkird (Institut d'Astrophysique de Paris)

10/03/2022, 16:05

The inference of cosmological quantities needs accurate and large cosmological simulations.Yet, the computational time takes millions of CPU hours for a modest coverage in cosmological scales (~(100 Mpc/h)^3). This ML method could have a decisive impact on the results derived from QSO surveys, e.g., SDSS3/4 data, which has a resolution power of R=1500 and R=2000. But it could be critical for...

56. Encoding large scale cosmological structure with Generative Adversarial Networks

Aurélien Decelle (Universidad Complutense de Madrid)

10/03/2022, 16:25

Recent progresses in Machine Learning have unlocked new possibilities to tackle scientific problems by means of neural networks, and already many applications have been developed both in astrophysics and cosmology. In this presentation, using a Generative Adversarial Network (GAN), an unsupervised learning model, we demonstrate the possibility to learn the distribution of dark matter of the...

57. TBD

Oliver Hahn