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The dark Universe corresponds to the period between the thermal decoupling matter-radiation and the formation of the first objects. During this epoq, molecules can appeared. In this talk, I will recall the nucleosynthesis processes, then the chemistry of the primordial Universe. I will discuss the influence of the primordial molecules on the protocloud evolution .
A brief essay on how studying neutrinos can help us to better understand the Universe.
Data from the Planck satellite imply new dates for the major eras of the universe. The era of radiation ended 50,150 years after inflation and the era of matter 10.31 billion years after inflation or 3.51 billion years ago.
In this pedestrian approach I give my personal point of view on the various problems posed by dark matter in the universe. After a brief historical overview I discuss the various solutions stemming from high energy particle physics, and the current s
We study the formation of first molecules, negative Hydrogen ions and molecular ions in model of the Universe with cosmological constant and cold dark matter. The cosmological recombination is described in the framework of modified model of the effec
The evolution of the fireball resulting from the August 2020 Beirut explosion is traced using amateur footage taken during the first $sim$ 230 $ms$ after the detonation. 38 frames separated by $sim$ 16.66 - 33.33 $ms$ are extracted from 6 different v