92 citations · 557 across the 29 of their papers we have counts for
31 papers
Topological Signatures of AGN Feedback in the Simba Simulations
Ryusei R. Kano, Romeel Davé, Tsutomu T. Takeuchi +1
Active galactic nuclei (AGN) feedback can alter the abundance and spatial distribution of galaxies within large-scale structure. We apply topological data analysis (TDA) to Simba h…
Machine Learning and the SKA for Cosmic Dawn and the Epoch of Reionization
Anshuman Acharya, Michele Bianco, Daniela Breitman +18
When operational, the SKA will generate unprecedented amounts of data and provide exquisite sensitivity for 21 cm tomography of Cosmic Dawn (CD) and the Epoch of Reionization (EoR)…
Inferring Cosmology and Astrophysics from the High-redshift 21cm Signal with SKA-Low
Anshuman Acharya, Satadru Bag, Sabrina Berger +29
The Square Kilometre Array's low frequency telescope (SKA-Low) will enable inference of astrophysical and cosmological parameters from the redshifted 21 cm signal, probing the Cosm…
Overview of 21cm Experiments at high redshift with SKAO
CD Science Working Group, Gianni Bernardi, Daniela Breitman +81
We provide an overview of the eight SKAO Science Book chapters that motivate the Epoch of Reionisation and Cosmic Dawn experiments with SKA-Low. We describe the individual SKA-Low…
Exploring the Cosmic Dawn through the 21 cm Forest and High-redshift Radio Sources with the SKA
Junsong Cang, Benedetta Ciardi, Barun Maity +12
The 21~cm forest, seen as absorption features in the spectra of distant radio sources, is produced by intervening neutral hydrogen and offers a direct probe of the neutral intergal…
Application of Machine Learning to 21 cm Cosmology
Hayato Shimabukuro
This chapter reviews applications of machine learning (ML) to redshifted 21 cm cosmology, focusing on cosmic dawn, the Epoch of Reionization, and SKA-Low science. The redshifted 21…
Reconstruction of Reionization Histories from 21 cm Power-Spectrum Evolution with Artificial Neural Networks
Yu-Le Wang, Hayato Shimabukuro
We investigate whether the redshift evolution of the fixed- dimensionless 21 cm power spectrum, , contains sufficient information to reconstruct reionization his…
Inferring population III star properties from the 21-cm global signal
Sho Ukai, Hayato Shimabukuro, Kenji Hasegawa +1
Investigating the properties of the first stars in the universe, known as Population III (Pop~III) stars, is essential, yet it remains an open question. One way to explore these st…
Wavelet-Scattering Signatures of Fuzzy Dark Matter in Simulated 21 cm Brightness-Temperature Maps
Hayato Shimabukuro, Shihang Liu, Bohua Li
We study the effect of fuzzy dark matter (FDM) on the multiscale morphology of simulated redshifted 21\,cm maps during Cosmic Dawn and the Epoch of Reionization. Using FDM-modified…
Topological Signatures of Heating and Dark Matter in the 21 cm Forest
Hayato Shimabukuro
We show that persistence-based topology of the 21 cm forest encodes information about Cosmic Dawn that is complementary to traditional amplitude- or correlation-based statistics. A…
Probing initial isocurvature perturbation with 21cm one-point statistics
Zhenfei Qin, Hayato Shimabukuro
Isocurvature perturbation--expected from multi-field inflation models--can leave unique signatures in the early Universe, but remain weakly constrained, especially on small scales.…
Analyzing the 21cm forest with Wavelet Scattering Transform: Insight into non-Gaussian features of the 21cm forest
Hayato Shimabukuro, Yidong Xu, Yue Shao
The 21cm forest, narrow absorption features in the spectra of high redshift radio sources caused by intervening neutral hydrogen, offers a unique probe of the intergalactic medium…
Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
A. Bonaldi, P. Hartley, R. Braun +179
We present and analyse the results of the Science data challenge 3a (SDC3a, https://sdc3.skao.int/challenges/foregrounds), an EoR foreground-removal community-wide exercise organis…
Nonlinear reconstruction of 21cm global signal from 21cm power spectrum with artificial neural networks
Hayato Shimabukuro
In this paper, we propose a novel method to recover the 21cm global signal from the 21cm power spectrum using artificial neural networks (ANNs). The 21cm global signal is crucial f…
Exploring the cosmic dawn and epoch of reionization with 21cm line
Hayato Shimabukuro, Kenji Hasegawa, Akira Kuchinomachi +2
The dark age of the universe, when no luminous object had existed, ended with the birth of the first stars, galaxies, and blackholes. This epoch is called cosmic dawn. Cosmic reion…
Impact of dark matter-baryon relative velocity on the 21cm forest
Hayato Shimabukuro, Kiyotomo Ichiki, Kenji Kadota
We study the effect of the relative velocity between the dark matter (DM) and the baryon on the 21cm forest signals. The DM-baryon relative velocity arises due to their different e…
21cm forest probes on the axion dark matter in the post-inflationary Peccei-Quinn symmetry breaking scenarios
Hayato Shimabukuro, Kiyotomo Ichiki, Kenji Kadota
We study the future prospects of the 21cm forest observations on the axion-like dark matter when the spontaneous breaking of the global Peccei-Quinn (PQ) symmetry occurs after the…
Predicting 21cm-line map from Lyman emitter distribution with Generative Adversarial Networks
Shintaro Yoshiura, Hayato Shimabukuro, Kenji Hasegawa +1
The radio observation of 21\,cm-line signal from the Epoch of Reionization (EoR) enables us to explore the evolution of galaxies and intergalactic medium in the early universe. How…
Estimation of HII Bubble Size Distribution from 21cm Power Spectrum with Artificial Neural Networks
Hayato Shimabukuro, Yi Mao, Jianrong Tan
The bubble size distribution of ionized hydrogen regions probes the information about the morphology of \HII\ bubbles during the reionization. Conventionally, the \HII\ bubble size…
Constraints on nature of ultra light dark matter particles with 21cm forest
Hayato Shimabukuro, Kiyotomo Ichiki, Kenji Kadota
The ultra-light scalar fields can arise ubiquitously, for instance, as a result of the spontaneous breaking of an approximate symmetry such as the axion and more generally the axio…
Analysing the 21cm signal from the Epoch of Reionization with artificial neural networks
Hayato Shimabukuro, Benoit Semelin
The 21 cm signal from the Epoch of Reionization should be observed within the next decade. While a simple statistical detection is expected with SKA pathfinders, the SKA will hopef…
Constraining the EoR model parameters with the 21cm bispectrum
Hayato Shimabukuro, Shintaro Yoshiura, Keitaro Takahashi +2
We perform a Fisher analysis to estimate the expected constraints on the Epoch of Reionization (EoR) model parameters (i.e., minimum virial temperature, the ionizing efficiency and…
Japanese Cosmic Dawn/Epoch of Reionization Science with the Square Kilometre Array
Kenji Hasegawa, Shinsuke Asaba, Kiyotomo Ichiki +10
Cosmic reionization is known to be a major phase transition of the gas in the Universe. Since astronomical objects formed in the early Universe, such as the first stars, galaxies a…
Cosmology with the Square Kilometre Array by SKA-Japan
Daisuke Yamauchi, Kiyotomo Ichiki, Kazunori Kohri +8
In the past several decades, the standard cosmological model has been established and its parameters have been measured to a high precision, while there are still many of the funda…