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1
Intro
2
Computing properties of materials systems
3
Outline
4
Density Functional Theory
5
Modelling crystalline systems
6
Errors arising in the course of the calculation
7
The perfect error bound
8
Abstract formulation
9
Guaranteed bounds
10
Main difficulties for applications to DFT
11
Formulation of the DFT ground state problem
12
Discretization with planewaves
13
First-order optimality conditions
14
Orthogonal projectors vs orbitals
15
Second-order geometry
16
Linearization in the asymptotic regime
17
Linearization : Numerical results
18
Choosing an adequate norm
19
Results: Force estimation for Silicon
20
Frequency splitting
21
Improved error bound
22
New estimation on the forces
23
Conclusion
Description:
Explore error bounds for properties in planewave electronic structure calculations in this 39-minute conference talk presented by Genevieve Dusson at IPAM's Large-Scale Certified Numerical Methods in Quantum Mechanics Workshop. Delve into accurate and computable error bounds for quantities of interest in electronic structure calculations, with a focus on estimating errors in ground state density matrices and interatomic forces. Examine the analysis of residuals from solved equations and their efficient approximation using computable terms. Gain insights into the perfect error bound, guaranteed bounds, and the main challenges in applying these concepts to Density Functional Theory (DFT). Investigate the formulation of the DFT ground state problem, discretization with planewaves, and first-order optimality conditions. Study linearization in the asymptotic regime, numerical results for force estimation in Silicon, and improved error bounds. Enhance your understanding of large-scale certified numerical methods in quantum mechanics through this comprehensive presentation. Read more

Error Bounds for Properties in Planewave Electronic Structure Calculations

Institute for Pure & Applied Mathematics (IPAM)
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