Abstract:

 

Until the emergence of first objects : first stars, first galaxies, the universe lived in “Dark Ages”. Filled with neutral hydrogen, the universe had to wait about 1 billion years until it became fully transparent to all radiations. This transition called the “epoch of reionization” changed the large scale structure of the universe forever.Thanks to the advanced detector technology, we are now able to discover extremely distant galaxies. In this talk, I will present how  we can use these distant galaxies to observe early universe.