A constrained optimal mode method gives upper bounds on slab ITG linear growth that track the true growth rate and critical gradient, while the tightest possible bound is shown to be a definitional Case-Van Kampen energy.
& Landreman, Matt 2025 Machine-learning Closure for Vlasov-Poisson Dynamics in Fourier-Hermite Space , arXiv:arXiv: 2504.13313
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Tightening energetic bounds on linear gyrokinetic instabilities
A constrained optimal mode method gives upper bounds on slab ITG linear growth that track the true growth rate and critical gradient, while the tightest possible bound is shown to be a definitional Case-Van Kampen energy.