Bulletin of the American Physical Society
2018 Annual Spring Meeting of the APS Ohio-Region Section and the AAPT Michigan Section
Volume 63, Number 7
Friday–Saturday, March 23–24, 2018; East Lansing, Michigan
Session G3: Contributed: Theoretical Physics |
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Room: Biomedical and Physical Sciences Building 1300 |
Saturday, March 24, 2018 2:00PM - 2:12PM |
G3.00001: Single photon transmission in disordered waveguide QED in the presence of chiral couplings Imran Mirza, John Schotland Strong light-matter interactions lie at the heart of several applications of quantum optics in information processing. In recent times, emitters coupled to nanophotonic waveguides (waveguide QED) has attracted a lot of attention due to the possibility of producing chiral (unidirectional) couplings between the emitters and the waveguide field [Nature, 541, 473-480 (2017)]. So far most of the work in the context of multiple emitter-waveguide QED has focused on the scenario in which emitters are periodically placed and are symmetrically coupled with the waveguide. In this talk, I'll discuss our recent work on this subject [Phys. Rev. A 96, 053804 (2017)] where we have considered a novel problem of photon transport in disordered waveguide QED (either emitter position or emitter transition frequency is disordered). Particularly, I'll focus on how the presence of semi-perfect to perfect chiral couplings can influence the formation of extended or localized photon states. [Preview Abstract] |
Saturday, March 24, 2018 2:12PM - 2:24PM |
G3.00002: Lessons learned from the observation of harmonic generation in ultrastrongly coupled polaritonic matter Michael Crescimanno, Bin Liu, Samuel Schwab, Kenneth Singer Recent experimental observation of harmonic generation in ultrastrongly coupled cavity polaritonic matter indicates a modification of the usual treatment of how non-linear optical (NLO)) response is modulated by an optical environment. We outline the different quantum optical theoretical approaches to the NLO, describe the recent relevant experimental results and use these to discern between theoretical models. [Preview Abstract] |
Saturday, March 24, 2018 2:24PM - 2:36PM |
G3.00003: Further Evidence for Stiff Symmetry Energy from Wide Isovector Aura Pawel Danielewicz, Yannick Cianyi On account of symmetry energy dropping with density, nuclear isovector density extends farther out than the isoscalar density, leading to an isovector aura surrounding a nucleus. The faster the drop of the energy with density, the wider the aura. The width and sharpness of the aura can be assessed by simultaneously analyzing elastic scattering and quasielastic charge-exchange data off the same target, with the two, respectively, testing primarily isoscalar and isovector densities. In the past (P. Danielewicz et al., Nucl. Phys. 958, 147 (2017)) we analyzed unpolarized nucleon elastic and quasielastic cross sections on $^{48}$Ca, $^{90}$Zr, $^{120}$Ca and $^{208}$Pb. We now augment the analyzed set with two more targets, $^{92}$Zr and $^{94}$Zr, and expand the data to include vector analyzing powers. The results consistently point to large widths, ~1fm, of the isovector aura, now for 6 nuclei. Such an aura implies stiff symmetry energy, with a slope parameter L>70MeV. The neutron skins may be viewed as nucleus-dependent reflections of the aura. [Preview Abstract] |
Saturday, March 24, 2018 2:36PM - 2:48PM |
G3.00004: Nonminimal Lorentz Violation in Electrodynamics and Applications Zonghao Li, V. Alan Kostelecky Lorentz violation can emerge in certain theoretical schemes unifying General Relativity and the Standard Model, and it is a popular candidate for modifications to low-energy physics. The Standard-Model Extension (SME) is a comprehensive framework designed to describe general Lorentz violation in the context of realistic effective field theory. Many experimental studies of minimal Lorentz-violating terms in the SME have been performed in the literature. In this talk, we obtain all nonminimal Lorentz-violating terms in electrodynamics and demonstrate some applications to experiments. In particular, we use existing experimental results for photon-photon scattering to place first constraints on certain nonminimal coefficients for Lorentz violation in the photon sector. [Preview Abstract] |
Saturday, March 24, 2018 2:48PM - 3:00PM |
G3.00005: Using Uncorrelated and Correlated $\chi^2$ Fitting to Constrain Transfer Cross Sections Garrett King, Amy Lovell, Filomena Nunes Recently, theoretical uncertainties have begun to be explored in nuclear reaction theory. These uncertainties arise from a number of sectors, but in this work, we focus on parametric uncertainties in optical potentials. These are studied by fitting elastic scattering data then propagating the resulting uncertainties to predicted transfer cross sections. Optical model parameters were determined using a $\chi^2$ minimization to find best fits to proton-, neutron-, and/or deuteron-target elastic scattering data. Regions of 95$\%$ confidence were then constructed around the minima of these fits. These potentials were subsequently used to predict 95$\%$ confidence regions for transfer cross sections using both the Adiabatic Wave Approximation (ADWA) and the Distorted Wave Born Approximation (DWBA). This procedure was compared to a correlated $\chi^2$ fitting, intended to take into account angular correlations in these approximations. In total, we studied five reactions with target mass range $A = 48$ - $208$ and energy range $E < 50$ MeV. Using the uncorrelated fitting procedure, ADWA had, on average, reduced uncertainties in the transfer cross section predictions when compared to DWBA. The correlated $\chi^2$ function led to larger 95$\%$ confidence bands in the transfer predictions. [Preview Abstract] |
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