July 9, 2020 to January 31, 2025
Europe/Zurich timezone


Dear colleagues,
We would like to invite you to take part in the upcoming 143rd Copernicus Webinar.
Time:              1st August, Tuesday, at 3pm CEST (9 pm Beijing, 10pm JST, 9 am EDT)
Speaker:         Mohammad Mehdi Sheikh-Jabbari (IPM, Iran)

Title: Evolution in Dipole Lambda CDM Cosmology, from Big Bang to Now


Dipole cosmology is the maximally Copernican generalization of the FLRW paradigm that can incorporate bulk flows in the cosmic fluid. In this talk, I first discuss 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). I present a dipole Lambda CDM model which has radiation and matter with independent flows, with (or without) a positive cosmological constant. We follow evolution of the model from Big Bang and discuss the singularity around the Big Bang. A remarkable feature of dipole Lambda CDM model is that the relative flow between radiation and matter can increase at late times, which can contribute to eg., the CMB dipole. This can happen generically in the space of initial conditions. We discuss the significance of this observation for late time cosmic tensions.

Zoom link:
Meeting ID: 421 480 1692
Passcode: cosmology



This series is co-organised by the cosmology groups in the following institutions (in alphabetical order): 

Harvard University, Hong Kong University of Science and Technology, Institut d'Astrophysique de Paris, Institute of Physics of the Czech Academy of Science, Jagiellonian University, Kyoto University, Leiden University, Ludwig Maximilians University, McGill University, Perimeter Institute, Polish Society on Relativity, The Pennsylvania State University, The University of Tokyo, Tsinghua University, University of Geneva, University of Groningen, University of Science and Technology of China, University of Waterloo.

Science Organising Committee members (in alphabetical order):

Niayesh Afshordi, Robert Brandenberger, Yifu Cai, Xingang Chen, Ema Dimastrogiovanni, Ruth Durrer, Ghazal Geshnizjani, Chunshan Lin, Jerome Martin, Jakub Mielczarek, Viatcheslav Mukhanov, Shinji Mukohyama, Subodh Patil, Misao Sasaki, Sarah Shandera, Wei Song, Alexander Vikman, Yi Wang, Zhong-Zhi Xianyu