Bulletin of the American Physical Society
2015 Annual Spring Meeting of the APS Ohio-Region Section
Volume 60, Number 3
Friday–Saturday, March 27–28, 2015; Kent, Ohio
Session F2: Heavy Ion Theory III |
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Chair: Jorge Noronha, Columbia University Room: KSU Student Center 314 |
Saturday, March 28, 2015 11:35AM - 11:50AM |
F2.00001: Thermal Properties of Hot and Dense Matter Brian Muccioli, Constantinos Constantinou, Madappa Prakash, James Lattimer We have calculated the thermal properties of hot and dense matter of relevance to core-collapse supernovae, neutron stars from their birth to old age, and mergers of compact binary stars using zero- and finite- range potential models (e.g., Skyrme, APR, MDI, etc.) as well as relativistic mean-field theoretical models. Properties explored include the pressure, energy density, entropy per baryon, inverse susceptibilities, specific heats at constant volume and pressure, and the thermal and adiabatic indices of isospin asymmetric matter containing leptons and photons. In all cases, comparisons of the exact numerical results with analytic results are performed to delineate the density and temperature regions for which matter is degenerate, semi-degenerate or non-degenerate. In this talk, similarities and differences between the results of the models studied will be reported. The influence of the nucleon Landau effective masses on the thermal properties will be highlighted. [Preview Abstract] |
Saturday, March 28, 2015 11:50AM - 12:05PM |
F2.00002: The centrality dependence of jet production in d-Au and p-Pb collisions Michael Kordell II, Abhijit Majumder We study the correlation between jet production in d-Au and p-Pb collisions and the number of charged particles produced (Nchg). Collisions are carried out by modifying the PYTHIA event generator for p/n-p/n collisions. Exact energy conservation, in a collision of one nucleon (from the d) with a column of N nucleons (from Au or Pb), is incorporated by elevating one nucleon in a p-p collision to a ``super'' nucleon, enhancing the parton distribution functions by N. We include a new implementation of a transverse density dependent event-by-event shadowing. The results for high pT $\pi $0 production, binned in centrality by the number of charged particles produced, are compared with data from PHENIX; the results for jet production binned in centrality are compared with data from ATLAS. We observe the observed enhancement of peripheral events compared to central for both d-Au and p-Pb. [Preview Abstract] |
Saturday, March 28, 2015 12:05PM - 12:20PM |
F2.00003: Searches of Discrete Fitness Landscapes Sam Smith, Gonzalo Ordonez The fitness of a value queried by a search is the extent to which it matches the search's criteria; the fitness space is the discrete space of all possible values and their respective fitnesses. Searching a fitness space is analogous to searching for the ground state in a lattice, with the fitness as the site-dependent energy. We sought to understand and compare the different computational methods of searching such spaces. We focused on classical and quantum random walks on the N-cube graph with a site-dependent potential. We began by altering the coin operator to bias the walk to the fittest point, which was simpler for the classical case than the quantum. We explored using Grover's method to discretize different diffusion equations, the Schr\"odinger and the Smoluchowski (advection-diffusion), finding the quantum now simpler than the classical. We determined that the use of the Smoluchowski equation was inappropriate because of the discrete nature of the space and had the particle search the space by comparing each neighbor's energy to the average energy of all neighbors. Comparing this method to the Schr\"odinger equation, we found the hitting time to be faster for the classical but a greater probability of success for the quantum. [Preview Abstract] |
Saturday, March 28, 2015 12:20PM - 12:35PM |
F2.00004: Holographic Invariance Matrix Theory (HIMT) Paul OBrien HIMT combines the Holographic principal with relativity. It calculates the total energy, rest mass, size, temperature, entropy, Enthalpy, and form at the start of our universe. Since it quantizes maximum local energy densities it avoids singularities and infinities. This theory confirms the holographic principal. HIMT shows that the all the matter and energy in our universe, including QCD matter is derived from half Plank mass Black Holes. HIMT can help this field immediately not only by quantizing temperature, but measuring the Enthalpy of the universe, and half Plank mass Black Holes. [Preview Abstract] |
Saturday, March 28, 2015 12:35PM - 12:50PM |
F2.00005: Halo EFT treatment of 6He up to NLO Arbin Thapaliya, Daniel Phillips Halo nuclei exhibit separation of scales and are therefore amenable to an Effective Field Theory (EFT) description. In Halo EFT, $^6$He can be thought of as a tight $^4$He $(\alpha)$ core surrounded by two loosely bound neutrons ($n$), hence it constitutes an effective Borromean three-body system. The valence neutrons of $^6$He interact with the $\alpha$-core predominantly through a $p$-wave $(^2P_{3/2})$ resonance while the two neutrons are in relative $s$-wave $(^1S_0)$ resonance. The leading order (LO) Halo EFT calculations using momentum-space Faddeev equations pertinent to such a treatment of bound $^6$He were carried out by Ji et al. in Phys.\ Rev.\ C {\bf 90}, no. 4, 044004 (2014). As an extension to that work, we are investigating $^6$He up to NLO within Halo EFT. In this talk, I will demonstrate how the NLO piece of the $^1S_0$ $nn$ dimer propagator, the NLO piece of the $^2P_{3/2}$ $n\alpha$ dimer propagator and the contact $n\alpha$ vertex in the $^2S_{1/2}$ channel become important at NLO in the three-body problem. I will show the diagrams that contribute to the NLO three-body $t$-matrix and discuss their divergences and renormalization. [Preview Abstract] |
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