360 research outputs found
Bender-Dunne Orthogonal Polynomials, Quasi-Exact Solvability and Asymptotic Iteration Method for Rabi Hamiltonian
We present a method for obtaining the quasi-exact solutions of the Rabi
Hamiltonian in the framework of the asymptotic iteration method. The energy
eigenvalues, the eigenfunctions and the associated Bender-Dunne orthogonal
polynomials are deduced. The latter prove to have a nonpositive definite norm.Comment: 10 page
The effective potential and resummation procedure to multidimensional complex cubic potentials for weak and strong-coupling
The method for the recursive calculation of the effective potential is
applied successfully in case of weak coupling limit (g tend to zero) to a
multidimensional complex cubic potential. In strong-coupling limit (g tend to
infinity), the result is resumed using the variational perturbation theory
(VPT). It is found that the convergence of VPT-results approaches those
expected.Comment: 19 pages, 0 figur
LifeTime-aware Backpressure - a new delay-enhanced Backpressure-based routing protocol
Dynamic Backpressure is a highly desirable family of routing protocols known for their attractive mathematical proprieties. However, these protocols suffer from a high end-to-end delay making them inefficient for real-time traffic with strict endto-end delay requirements. In this paper, we address this issue by proposing a new adjustable and fully distributed Backpressurebased scheme with low queue management complexity, named LifeTime-Aware BackPressure (LTA-BP). The novelty in the proposed scheme consists in introducing the urgency level as a new metric for service differentiation among the competing traffic flows in the network. Our scheme not just significantly improves the quality of service provided for real-time traffic with stringent end-to-end delay constraints, but interestingly protects also the flows with softer delay requirements from being totally starved. The proposed scheme has been evaluated and compared against other state of the art routing protocol, using computer simulation, and the obtained results show its superiority in terms of the achieved end-to-end delay and throughput
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