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A group of international scientists has made significant strides in understanding the large-scale structure of the Universe by identifying critical gravitational regions, termed "basins of attraction." This research was spearheaded by Dr. Valade as part of his doctoral studies, under the guidance of Prof. Yehuda Hoffman from the Hebrew University of Jerusalem and Prof. Noam Libeskind from AIP Po by Erica Marchand
Paris, France (SPX) Sep 30, 2024
A group of international scientists has made significant strides in understanding the large-scale structure of the Universe by identifying critical gravitational regions, termed "basins of attraction." This research was spearheaded by Dr. Valade as part of his doctoral studies, under the guidance of Prof. Yehuda Hoffman from the Hebrew University of Jerusalem and Prof. Noam Libeskind from AIP Potsdam. The study also saw contributions from Dr. Pomarede from the University of Paris-Saclay, Dr. Pfeifer from AIP Potsdam, and Prof. Tully along with Dr. Kourkchi from the University of Hawaii.
Insights into the Universe's Structure
The research is anchored in the Lambda Cold Dark Matter (LCDM) cosmological model, which posits that the Universe's large-scale structures evolved from quantum fluctuations during early cosmic inflation. These minor density variations grew over time, forming galaxies and galaxy clusters. As these density fluctuations intensified, they drew in surrounding matter, forming areas known as "basins of attraction," which are regions where gravitational forces dominate.
Innovative Methods with Cosmicflows-4 Data
The team utilized the latest Cosmicflows-4 (CF4) data and a Hamiltonian Monte Carlo algorithm to map the large-scale structure of the Universe, extending up to about a billion light years. This approach enabled the researchers to identify gravitational domains, providing a probabilistic model of the most significant basins of attraction influencing galactic movements.
Discovering Laniakea and Shapley Basins of Attraction
Earlier studies classified the Milky Way as part of the Laniakea Supercluster. However, the newly available CF4 data suggests that Laniakea might be within the larger Shapley basin of attraction, which covers an even greater region of the local Universe.
One of the most notable findings from the research is the identification of the Sloan Great Wall as the largest basin of attraction. This region encompasses approximately half a billion cubic light years, making it over twice the size of the Shapley basin, previously thought to be the largest. These discoveries shed new light on the gravitational forces that shape the Universe and provide a fresh perspective on the evolution and interaction of galaxies over time.
Advancing Cosmological Understanding
This study marks a major leap in the understanding of the Universe's gravitational structure and dynamics. By pinpointing basins of attraction, the researchers have uncovered the crucial gravitational forces that shape cosmic flows and large-scale formations. The study's findings also pave the way for a better understanding of dark matter distribution and the factors driving cosmic expansion.
The research not only enhances our knowledge of the Universe's past and ongoing evolution but also holds the potential to refine current cosmological models and guide future research in astronomy.
Research Report:Identification of basins of attraction in the local universe
Related Links
The Hebrew University of Jerusalem
Understanding Time and Space