Webinar〝On the cosmological constant appearing as an initial condition for inflationary models〞

It’s known that some Friedman-Lemaître-Robertson-Walker(FLRW) inflationary models admit spacetime extensions through the big bang. For k = -1 FLRW spacetimes, they are known as “Milne-like spacetimes”. For k = 0 FLRW spacetimes, they are known as “past-asymptotically de Sitter” spacetimes. In both cases, a new set of coordinates shows that the big bang is a coordinate singularity for these spacetimes, and, in both cases, the cosmological constant appears as an initial condition, i.e. the equation of state for the energy density and pressure takes the form of a cosmological constant precisely at the big bang for these models. In this talk, the speaker shows the generalization of this fact to nonhomogeneous versions of these spacetimes by exploring the geometry of the big bang in the spacetime extension. This has applications to inflationary theory for nonhomogeneous FLRW models. This is joint work with Ghazal Geshnizjani and Jerome Quintin.

時間:2023.07.11(二) 21:00~22:20
頻道:Zoom ID:421-480-1692 ← cosmology
講者:Eric Ling (University of Copenhagen & University of Toronto)



“Copernicus Webinar and Colloquium Series”: To promote scientific discussions during this pandemic, they are organizing an online seminar series, i.e. Copernicus Webinar Series, seeking the most outstanding speakers to introduce innovative ideas and important progress in the field of gravity and cosmology. This series is named after the famous Polish Astronomer, Nicolaus Copernicus, whose discovery eventually marked the dawn of modern science.




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