Wednesday November 19, 2014
Schoenbaum Hall, Room 105
210 W Woodruff Ave
7:15pm - 8:15pm
Free and open to All, given at level for a general audience. ASL interpreter provided.
Congratulations to Shirley Li, who was one of the winners of the 2014 Physics department PGSC poster competition. Her poster was on her work calculating cosmic-ray muon induced backgrounds in the neutrino detector Super-Kamiokande. Shirley was also part of a small group that was awarded the best student project at 2014 SLAC Summer Institute "Shining Light on Dark Matter." Their project was to constrain the density slope at the Milky Way center.
One of the major goals of the ASAS-SN project is to produce a complete census of bright, nearby supernovae. In the last few months, using four 14-cm diameter telescopes in Hawaii and two such telescopes in Chile (this expansion was funded mostly by CCAPP), ASAS-SN has been finding about 10 bright (V <17) supernovae per month.
The existence of voids, almost entirely empty regions of the cosmic web, has been confirmed by several spectroscopic surveys in the past years. But so far, nobody knew how empty voids really are. By using a technique called gravitational lensing, an international team led by Ohio State CCAPP astrophysicists Peter Melchior and Paul Sutter inferred the mass inside voids - or rather: the absence thereof.
The universe is really, really big, so simulations of the universe must also be really, really big. The latest, run by a team including Ohio State CCAPP astrophysicist Paul Sutter, followed the evolution of over 1 trillion particles of dark matter. It's one of the largest simulations ever performed, and you can visit it.
At the largest scales the universe looks like an enormous spider web, with long rope-like filaments, dense clumps of galaxies, and vast empty regions called voids. Ohio State CCAPP astrophysicist Paul Sutter and an international team of collaborators have developed a method to find these voids, and they made a surprising discovery: voids obey a simple mathematical equation.
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