The Instituto de Astrofísica de Canarias (IAC) has led an international team which has developed an algorithm called COSMIC BIRTH to analyse large scale cosmic structures. This new computation method will permit the analysis of the evolution of the structure of dark matter from the early universe until the formation of present day galaxies. This work was recently published in the journal Monthly Notices of the Royal Astronomical Society (MNRAS).
The IAC researcher, a co-author of the article and leader of the group of Cosmology and Large Scale Structure (LSS) Francisco-Shu Kitaura explains that one of the key aspects of this algorithm “consists in expressing the observations as if they had been detected in the early universe, which simplifies many of the calculations”.
“Our algorithm uses sampling techniques designed to deal with high dimensional spaces, and is the product of more than four years of development. That is why I thank the funding programmes Ramon y Cajal and Excelencia Severo Ochoa which have allowed us to make scientific journeys which are such a challenge and a risk”, he adds.
“It is fascinating to use the methods of classical mechanics to reconstruct the large scale structure of huge cosmic volumes”, says Mónica Hernández Sánchez, a doctoral student at the IAC and the University of La Laguna (ULL), and first author of another linked article, who has shown that an idea of the particle physicists from 30 years ago has proved useful in the present context.
The application of the COSMIC BIRTH algorithm to the combination of five distant surveys of COSMOS (Cosmic Evolution Survey) fields has been led by Metin Ata, a researcher at the Kavli Institute for Physics and Mathematics of the Universe (IPMU) in Japan. Thanks to this study it has been possible to explore, using Big Data techniques, the structures which include the formation of emerging galaxy clusters at "cosmic noon", the moment when the Universe illuminated galaxies with stars.
The authors have dedicated this last work to the French astrophysicist Olivier Le Fèvre, who participated in the study and who unfortunately passed away while it was being completed.
Main article: Kitaura et al. “COSMIC BIRTH: Efficient Bayesian Inference of the Evolving Cosmic Web from Galaxy Surveys, MNRAS, 2021. https://ui.adsabs.harvard.edu/abs/2020MNRAS.tmp.3630K/abstract
- Arxiv: https://arxiv.org/pdf/1911.00284.pdf
1) Hernández-Sánchez, Kitaura et al 2021:
2) Ata, Kitaura et al 2021:
Contact at the IAC:
- Francisco-Shu Kitaura: fkitaura [at] iac.es