Speaker
Alexander (Oleksandr) Zhuk
(Astronomical Observatory, Odessa I.I. Mechnikov National University, Dvoryanskaya St. 2, Odessa 65082, Ukraine; Center for Advanced Systems Understanding, Untermarkt 20, 02826 G¨orlitz, Germany)
Description
In my talk, I will present a model where the Universe is filled with a phantom scalar field with a potential in the form of a hyperbolic tangent, as well as cold dark matter and radiation. This model is free from the shortcomings usually attributed to phantom models and undergoes a rapid Anti-de Sitter to de Sitter transition. At the background level, a detailed analysis of the model is performed. The numerical integration of the equations of motion is performed in such a way that both the CMB and SH0ES data are satisfied. Thus, this model points to a possible solution to the problem of cosmological tensions in theories where the cosmological constant changes its sign.
Primary author
Alexander (Oleksandr) Zhuk
(Astronomical Observatory, Odessa I.I. Mechnikov National University, Dvoryanskaya St. 2, Odessa 65082, Ukraine; Center for Advanced Systems Understanding, Untermarkt 20, 02826 G¨orlitz, Germany)
Co-authors
Dr
A. Emrah Yükselci
(Department of Physics, Istanbul Technical University, Maslak 34469 Istanbul, Türkiye)
Ms
Anna Anna Tsikoundoura
(Department of Physics, University of Ioannina, GR-45110, Ioannina, Greece)
Leandros Perivolaropoulos
(University of Ioannina)
Prof.
Özgür Akarsu
(Istanbul Technical University)
