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TIME AND SPACE
Big Data to model the evolution of the cosmic web
by Staff Writers
La Laguna, Spain (SPX) Feb 24, 2021

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The Instituto de Astrofisica 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 Monica Hernandez Sanchez, 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.

"It has been exciting to explore, using Big Data techniques, the structures which include the formation of galaxy clusters emerging at "cosmic noon". That is the moment when the Universe lit up the galaxies with stars", notes Metin Ata, a researcher at the Kavli Institute for Physics and Mathematics of the Universe (IPMU), in Japan, and leader of the application of the COSMIC BIRTH algorithm to the combination of five studies of distant clusters in the COSMOS (Cosmic Evolution Survey) fields.

The authors have dedicated this last work to the French astrophysicist Olivier Le Fever, who participated in the study and who unfortunately died while it was being completed.

Research Report: "Cosmic Birth: Efficient Bayesian Inference of the Evolving Cosmic Web from Galaxy Surveys"


Related Links
Instituto de Astrofisica de Canarias
Understanding Time and Space


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TIME AND SPACE
Supercomputer turns back cosmic clock
Tokyo, Japan (SPX) Feb 17, 2021
Astronomers have tested a method for reconstructing the state of the early Universe by applying it to 4000 simulated universes using the ATERUI II supercomputer at the National Astronomical Observatory of Japan (NAOJ). They found that together with new observations the method can set better constraints on inflation, one of the most enigmatic events in the history of the Universe. The method can shorten the observation time required to distinguish between various inflation theories. Just afte ... read more

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