Star-UBB Seminar Series:- Promising findings for simultaneous alleviation of major Cosmological tensions through the ΛₛCDM cosmology
In this talk, the speaker will begin with a brief introduction to the ΛₛCDM model. This model explores a recent conjecture suggesting a rapid transition of the universe from anti-de Sitter vacua to de Sitter vacua. Specifically, the cosmological constant switches sign from negative to positive at redshift z†∼1.7, inspired by the graduated Dark Energy(gDE). Following the introduction, he will present the results of a comprehensive observational analysis. This analysis demonstrates that ΛₛCDM, which predicts z†≈1.7, simultaneously addresses the major cosmological tensions present in the standard ΛₛCDM model. These tensions include the H₀, Mʙ, and S₈ tensions, along with other less significant tensions such as the BAO Ly-α discrepancy. He will conclude with a brief discussion of the possible observational and theoretical implications of these findings for our current understanding of the universe.
頻道：Zoom ID:853-7454-4159 ←
講者：Prof. Özgür Akarsu (Department of Physics, Istanbul Technical University, Maslak, Istanbul, Turkey)
Scientific and Technological Advanced Research- Babeș-Bolyai University(Star-UBB) Seminar Series in Gravitation, Cosmology and Astrophysics
Presently a period of rapid and intense change are being witnessed in our understanding of the gravitational force, at a rate that is quickly increasing since the important observational discoveries of the late 1990s. With the advent of new observational techniques, the emergence of important cosmological and astrophysical paradigms can be seen that lead to a deep change in our understanding of the Universe. Astronomical observations strongly suggest that at large scales the force of gravity may not behave according to standard general relativity, and that a generalization of the gravitational action, either at the geometric level, or at the matter level, may be required for a full understanding of the gravitational interaction.
The goal of the present seminar is to bring Theoretical Gravitational Physics closer to the observations and experiments, and to discuss current topics in general relativity, high-energy physics, astrophysics and cosmology.