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Sobolev gradient fl...
Sobolev gradient flow for the Gross-Pitaevskii eigenvalue problem : Global convergence and computational efficiency
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- Henning, Patrick, 1983- (author)
- KTH,Numerisk analys, NA
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- Peterseim, Daniel (author)
- Univ Augsburg, Inst Math, Univ Str 14, DE-86159 Augsburg, Germany.
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(creator_code:org_t)
- Society for Industrial & Applied Mathematics (SIAM), 2020
- 2020
- English.
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In: SIAM Journal on Numerical Analysis. - : Society for Industrial & Applied Mathematics (SIAM). - 0036-1429 .- 1095-7170. ; 58:3, s. 1744-1772
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We propose a new normalized Sobolev gradient flow for the Gross-Pitaevskii eigenvalue problem based on an energy inner product that depends on time through the density of the flow itself. The gradient flow is well-defined and converges to an eigenfunction. For ground states we can quantify the convergence speed as exponentially fast where the rate depends on spectral gaps of a linearized operator. The forward Euler time discretization of the flow yields a numerical method which generalizes the inverse iteration for the nonlinear eigenvalue problem. For sufficiently small time steps, the method reduces the energy in every step and converges globally in H I- to an eigenfunction. In particular, for any nonnegative starting value, the ground state is obtained. A series of numerical experiments demonstrates the computational efficiency of the method and its competitiveness with established discretizations arising from other gradient flows for this problem.
Subject headings
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
Keyword
- Bose-Einstein condensates
- ground states
- Sobolev gradients
- Gross-Pitaevskii equation
- nonlinear eigenvalue problems
Publication and Content Type
- ref (subject category)
- art (subject category)
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