Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session G13: Developments in Quantum Field TheoryLive

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Sponsoring Units: DPF Chair: James Halverson, Northeastern University Room: Maryland C 
Sunday, April 19, 2020 8:30AM  8:42AM Live 
G13.00001: Quantum simulation of quantum field theory in the lightfront formulation Gary Goldstein, Michael Kreshchuk, William Kirby, Hugo Beauchemin, Peter Love Quantum simulation of quantum field theories offers a new way to investigate properties of the fundamental constituents of matter. We develop quantum simulation algorithms based on the lightfront formulation of relativistic field theories. We analyze a simple theory in 1$+$1D and show how to compute the analogues of parton distribution functions of composite particles in this theory. Upon quantizing the system in lightcone coordinates, the Hamiltonian becomes block diagonal, each block approximating the Fock space with a certain harmonic resolution K. The lower bound on the number of qubits required is O($\surd $K), and we give a complete description of the algorithm in a mapping that requires O($\surd $K logK) qubits and O(K$^{\mathrm{6}}$ ) gates. In higher dimensions, the scaling of the number of qubits remains the same, up to logarithmic factors. This is a notable advantage of the lightfront formulation. [Preview Abstract] 
Sunday, April 19, 2020 8:42AM  8:54AM Live 
G13.00002: Numerical renormalization groupbased approach to secular perturbation theory Jose Galvez Ghersi, Leo Stein It is not unusual to find divergent solutions after applying the standard methods of perturbation theory to calculate truncated corrections to any set of equations of motion modified perturbatively. In this talk, we show a novel procedure, which not only avoids those divergences; but also improves the accuracy of firstorder solutions. Our technique maps the perturbed solution to the renormalization group generators to transform the constant model parameters into timedependent expressions. Such new model parameters boost the accuracy of the renormalized solutions. Prospectively, this procedure can be extended to the computation of corrected GW waveforms by extra degrees of freedom in modified theories of gravity. [Preview Abstract] 
Sunday, April 19, 2020 8:54AM  9:06AM Live 
G13.00003: Generalized HusainKuchar models in manifolds with boundaries Juan Margalef In this talk, I will present a family of generalization of some wellknown theories such as the Pontryagin model, the HusainKuchar model, or different formulations of 3dimensional GR with cosmological constant. When boundaries are included, this family presents an interesting holographic principle: we could obtain relevant theories in both the bulk and the boundary [1]. I will address the interplay between them within the Hamiltonian framework. I will also explain the appearance of some sectors of the phase space in which the dynamics are different. Generalizations of the Pontryagin and HusainKuchar actions to manifolds with boundary J. Fernando Barbero G., Bogar Díaz, Juan MargalefBentabol, Eduardo J.S. Villaseñor Journal of High Energy Physics 10 (2019) 121 [arXiv:1906.09820] [Preview Abstract] 
Sunday, April 19, 2020 9:06AM  9:18AM Live 
G13.00004: Open quantum dynamics in the early Universe Nishant Agarwal, Sarah Shandera, Archana Kamal, Brenden Bowen Primordial perturbations are responsible for CMB anisotropies and structure formation in the Universe. We believe that the perturbations have their origins in quantum theory, though these effects are hard to detect. I will discuss the quantum dynamics of observable perturbation modes in the presence of interactions during inflation. In particular, I will describe an open quantum system framework that demonstrates a nonHamiltonian and nonMarkovian evolution of observable modes. I will also discuss preliminary results on evolution under a simplifying Markovian approximation and the resulting Green’s functions. [Preview Abstract] 
Sunday, April 19, 2020 9:18AM  9:30AM Live 
G13.00005: Fermionmass and charge renormalization using the relativistic, timedependent Dirac equation Athanasios Petridis, Timothy Kutnink The timedependent electromagnetically selfcoupled Dirac equation is solved numerically by means of the staggeredleapfrog algorithm. The stability region of the method versus the interaction strength and the ratio of the spatialgrid size over the timestep is established. The expectation values of several dynamic operators are evaluated as functions of time. These include the fermion and electromagnetic energies and the fermion dynamic mass. There is a characteristic timedependence leading to asymptotic constants of these expectation values. In the case of the fermion mass and charge this amounts to renormalization. The dependence of the expectation values on the spatialgrid size is evaluated and yields finite results due to the finiteness and continuity of the spinor. The contribution of positive and negative energy states to the asymptotic values and the gauge fields is analyzed. A statistical method, employing a canonical ensemble whose temperature is the inverse of the spatialgrid size, is used to remove the momentumdependence. A result for each spatialgrid size value is obtained. The continuum limit is taken to calculate both the fermion mass and charge. The renormalization mass correction is 10\% and the charge correction is about 30\%. [Preview Abstract] 
Sunday, April 19, 2020 9:30AM  9:42AM Not Participating 
G13.00006: HypergeometricMeijer G Resummation in Quantum Field Theory Abouzeid Shalaby Inspired by the simple Hypergeometric resummation algorithm in PRL. 115, 143001 (2015), we developed the HypergeometricMeijer G Resummation algorithm that can incorporate all weakcoupling, strongcoupling and Largeorder data. We shall shed light on its simplicity and power to predict precise results in different problems in physics from PTsymmetric models, quantomechanical problems as well as critical exponents of the O(N)symmetric quantum field model. We also stress how within this algorithm one can link exact critical exponents to known parameters from a Largeorder parameter, a vey important realization ( for the first time) as explained in our article in \underline {arXiv:1911.03571}. [Preview Abstract] 
Sunday, April 19, 2020 9:42AM  9:54AM Not Participating 
G13.00007: Electrodynamic friction of a charged particle passing a conducting plate Yang Li We investigate the friction acting on a charged particle moving parallel to an imperfect conductor slab described with the Drude model. In nonrelativistic and ultrarelativistic regimes, the properties of frictions due to the TE and TM modes are quite different. The velocity dependence of the friction is nonmonotonic. The friction may be nonzero in the lowresistivity limit when the particle is moving with a high velocity. Other properties of the friction are also studied [Preview Abstract] 
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