Date : The 18th of November, 2015.
Speaker : Dr. Ken Chen (EACOA fellow, NAOJ)
Title : The Cosmic Dawn : Physics of the First Luminous Objects
Abstract:
One of the paramount problems in modern cosmology is to elu
cidate how the first generation of luminous objects, stars,
supernovae, accreting black holes, and galaxies, shaped the
early universe at the end of the cosmic dark ages. According
to the modern theory of cosmological structure formation, t
he hierarchical assembly of dark matter halos provided the g
ravitational potential wells that allowed gas to form stars
and galaxies inside them. Modern large telescopes have pushe
d the detection of galaxies up to a redshift of z ~ 10. Howe
ver, models of the first luminous objects still require con
siderable effort to reach the level of sophistication necess
ary for meaningful predictions, Due to the complexity of inv
olved physical phenomena, this physical understanding may on
ly come by the proper use of numerical simulations. Therefor
e, I have used state-of-the-art simulations on some of large
st supercomputers to study these objects. In my talk, I will
discuss the possible physics behind the formation of these
first luminous objects by presenting the results from our s
imulations. I will also give possible observational signatur
es of the cosmic dawn that will be the prime targets for the
future telescopes such as the James Webb Space Telescope (J
WST).


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