نتایج جستجو برای: روش دستگاهی wkb

تعداد نتایج: 371322  

Journal: :The Astrophysical journal 2000
Aguirre

Recently Van Putten has suggested that superradiance of magnetosonic waves in a toroidal magnetosphere around a Kerr black hole may play a role in the central engine of gamma-ray bursts. In this context, he computed (in the WKB approximation) the superradiant amplification of scalar waves confined to a thin equatorial wedge around a Kerr hole and found that the superradiance is higher than for ...

1996
Shuxue Ding Yasushige Maeda Masaru Siino

We investigate topology changing processes in the WKB approximation of four dimensional quantum cosmology with a negative cosmological constant. As Riemannian manifolds which describe quantum tunnelings of spacetime we consider constant negative curvature solutions of the Einstein equation i.e. hyperbolic geometries. Using four dimensional polytopes, we can explicitly construct hyperbolic manif...

Journal: :J. Comput. Physics 2007
Naoufel Ben Abdallah Mireille Mouis Claudia Negulescu

An accelerated algorithm for the resolution of the coupled Schrödinger/Poisson system, with open boundary conditions, is presented. This method improves the subband decomposition method (SDM) introduced in [N. Ben Abdallah, E. Polizzi, Subband decomposition approach for the simulation of quantum electron transport in nanostructures, J. Comp. Phys. 202 (2005), no. 1, 150–180]. The principal feat...

1994
Piljin Yi

Pair-production of magnetic Reissner-Nordström black holes (of charges ±q) is studied in the next-to-leading WKB approximation. We consider generic quantum fluctuations in the corresponding instanton geometry, a detailed study of which suggests that, for sufficiently weak field B, the problem can be reduced to that of quantum fluctuations around a single truncated near-extremal Euclidean black ...

Journal: :The Journal of chemical physics 2008
Yair Goldfarb Jeremy Schiff David J Tannor

We present a significant improvement to a complex time-dependent WKB (CWKB) formulation developed by Boiron and Lombardi [J. Chem. Phys. 108, 3431 (1998)] in which the time-dependent WKB equations are solved along classical trajectories that propagate in complex space. Boiron and Lombardi showed that the method gives very good agreement with the exact quantum mechanical result as long as the wa...

Journal: :Communications in Mathematical Physics 2006

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