Bulletin of the American Physical Society
2015 Annual Fall Meeting of the APS Ohio-Region Section
Volume 60, Number 12
Friday–Saturday, October 16–17, 2015; Cleveland, Ohio
Session E4: Theoretical and Computational Physics |
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Chair: Jacqueline Vitali, Cleveland State University Room: SC 339 |
Saturday, October 17, 2015 9:15AM - 9:27AM |
E4.00001: Searching for Trans-Neptunian Objects using the Dark Energy Survey Zachary Elledge Trans-Neptunian objects are objects that reside between these two structures. They come from the Kuiper Belt and have a semi major axis that is greater than the orbit of Neptune (30 AU). To find these object I used the Dark Energy survey observations. The Dark Energy Survey is a five year survey started August 2013 and goes from August to February. It is located in Cerro Tololo observatory in Chile and uses the Blanco 4 meter telescope. It uses the imager DECam which contains 62 science CCDs with 520 megapixels and images 3 square degrees. The Dark Energy Survey is made of the Wide Survey which is a survey of 5000 square degrees of the sky and a supernova survey which is 10 3 square degree fields that are surveyed weekly. I used the never before used data from the wide field survey to find 16 Trans-Neptunian objects that had not been observed in more than 10 years. This made sure that they did not disappear due to a large positional uncertainty. I did this by writing a code that searched for objects that would fall the observations made by the Dark Energy Survey and then checked to see if they were there. After it pulled up another night that contained the same position and checked to see if the Trans-Neptunian object candidate was gone. [Preview Abstract] |
Saturday, October 17, 2015 9:27AM - 9:39AM |
E4.00002: Quasiparticle equation of state for anisotropic hydrodynamics Mubarak Alqahtani, Mohammad Nopoush, Michael Strickland We present a new method for imposing a realistic equation of state in anisotropic hydrodynamics. The method relies on the introduction of a single finite-temperature quasiparticle mass which is fit to lattice data. By taking moments of the Boltzmann equation, we obtain a set of coupled partial differential equations which can be used to describe the 3+1d spacetime evolution of an anisotropic relativistic system. We then specialize to the case of a 0+1d system undergoing boost-invariant Bjorken expansion and subject to the relaxation-time approximation collisional kernel. Using this setup, we compare results obtained using the new quasiparticle equation of state method with those obtained using the standard method for imposing the equation of state in anisotropic hydrodynamics. We demonstrate that the temperature evolution obtained using the two methods is nearly identical and that there are only small differences in the pressure anisotropy. However, we find that there are significant differences in the evolution of the bulk pressure correction. [Preview Abstract] |
Saturday, October 17, 2015 9:39AM - 9:51AM |
E4.00003: The Performance of the Heavy Flavor Tracker Detector at STAR Ayman Hamad The Heavy Flavor Tracker (HFT$^{1})$ is a silicon vertex detector for the STAR experiment that was built and installed at the Relativistic Heavy Ion Collider at Brookhaven National Lab in 2014. The HFT consists of four layers of silicon detectors. The two innermost layers use ultra-thin (50 microns) pixel sensors with a size of 20 X 20 microns that are made from Monolithic Active Pixel Sensors (MAPS). The air-cooled lightweight pixel detector is surrounded by a silicon pad and a silicon strip detector to interface to STAR's main tracking detector; the Time Projection Chamber (TPC). The full system is capable of a track pointing resolution of about 30 microns for 1 GeV/c pions. In Spring-2014 the HFT system had its first physics run recording about 1.2 billion Au$+$Au collisions at center of mass energy of 200 GeV/c. In this talk we will report on the status and performance of the HFT. [1] STAR Heavy Flavor Tracker Technical Design Report, \underline {https://drupal.star.bnl.gov/STAR/starnotes/public/sn0600} [Preview Abstract] |
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