Webinar “Evolution in Dipole ΛCDM Cosmology, from Big Bang to Now”

Dipole cosmology is the maximally Copernican generalization of the Friedmann–Lemaître–Robertson–Walker(FLRW) paradigm that can incorporate bulk flows in the cosmic fluid. In this talk, the speaker first discusses how multiple fluid components with independent flows can be realized in this set up. This is the necessary step to promote “tilted” Bianchi cosmologies to a viable framework for cosmological model building involving fluid mixtures (as in FLRW). He presents a dipole Lambda Cold Dark Matter(ΛCDM) model which has radiation and matter with independent flows, with (or without) a positive cosmological constant. He and his team follow evolution of the model from Big Bang and discuss the singularity around the Big Bang. A remarkable feature of dipole ΛCDM model is that the relative flow between radiation and matter can increase at late times, which can contribute to eg., the Cosmic Microwave Background(CMB) dipole. This can happen generically in the space of initial conditions. We will discuss the significance of this observation for late time cosmic tensions.

時間:2023.08.01(二) 21:00~22:20
頻道:Zoom ID:421-480-1692 ← cosmology
講者:Mohammad Mehdi Sheikh-Jabbari (IPM, Iran)



“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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