mirror of https://github.com/abinit/abinit.git
27 lines
1.0 KiB
Markdown
27 lines
1.0 KiB
Markdown
---
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description: How to bound a model in multibinit
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authors: AM,ACGC
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---
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This page gives hints on how to bound a model in multibinit.
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## Introduction
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When a model is build, it can contains phonons instabilities and may produce a divergence during the dynamics.
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To avoid such behaviour, multibinit includes an automatic procedure to bound the model.
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Multibinit will first generate a set of coefficients with a power range defined by [[multibinit:bound_rangePower]] and keep only the coefficients with even power.
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Then, the procedure is similar to the fit process with the constrains to only keep positive coefficients. Next, the bounding process will add the new coefficients to the model up to [[multibinit:bound_maxCoeff]] checking if the model is bound in each step of the process.
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## Tutorials
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The [[tutorial:lattice_model|First lesson on Multibinit]] explains how to build a lattice model and to run a dynamics.
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## Related Input Variables
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{{ related_variables }}
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## Selected Input Files
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{{ selected_input_files }}
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