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 Research No.3


Observation of declination caused from Gaussian distribution of density fluctuation in the early universe


Exploitation of the Universe before Big Bang

  Tracking back the history of the universe, anybody might have heard of a word "Big Bang", the time when the universe was in a frame of fireball. Now, going back forther, before Big Bang, it is considered that there was a time of inflation when the universe was rapidly expanded.

  During this inflation period the fluctuation lately becoming the source of formation of the universe, was developed, which in fact, various information of initial fluctuation still left as a trace in the current universe. During this inflation period, the fluctuation, lately becoming the source of formation of the universe, was developed.

  In fact, various information ofthe earlly fluctuation occurrede during this period still remains as a trace in the current universe. For example, the cosmic microwave background radiation (CMB) is the light, released 38 million years after the universe was created, and is a trace of Big Bang delivered to us, travelling for 137 billion light years. This light is considered well preserved the fluctuation developed by inflation, so many researched on this ware actively conducted in the past.

  I have been carrying out theoretical research using mainly CMB myself. My current extensive observation is becoming possible to trace the footsteps of the early universe through fluctuation of galactic distribution. I am now conducting research, having interests in seeking ways to exploit universe before Big Bang by using non-linear components of galactic distribution.

  I will be working at CfA (Harvard-Smithsonian Center for Astrophysics) for approximately one year until 2013 on Brain Circulation Program. Dr. Daniel Eisenstein, is one of the researchers taking us in during this Program, is currently a team leader of Sloan Digital Sky Survey (SDSS), the project attempting to create the world's largest map of universe. He is the prominent figure achieving various accomplishments on observational cosmology. In our Project, we anticipate to control non-linearity developed during the early universe by using data acquired by SDSS.

  Being the first time living in oversears, I am worried a lot with my English ability, but at the same time I am looking forward to my research in the tranquil suburban life in Cambridge. Making the most of my one-year opportunity, I would like to focus on my research meaningfully. I wish to become fluent in English by the time I return to Japan.

Tohoku University, Graduate School of Science, Astronomical Institute
Dr. Daisuke Nitta, a G-COE Assistant Professor.


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