LTBOUNDLIBXC
TBOUNDLIBXC = .TRUE. | .FALSE.
Default: TBOUNDLIBXC = .FALSE.
Description: TBOUNDLIBXC specifies whether or not the lower bound for the Kohn-Sham kinetic-energy density [math]\displaystyle{ \tau_{\sigma} }[/math] ([math]\displaystyle{ \tau_{\sigma}^{\textrm{W}}\lt \tau_{\sigma} }[/math]) is enforced before [math]\displaystyle{ \tau_{\sigma} }[/math] is used in a meta-GGA functional from Libxc.
The Kohn-Sham kinetic-energy density [math]\displaystyle{ \tau_{\sigma} }[/math] should in principle be larger than the von Weizsäcker kinetic-energy density [math]\displaystyle{ \tau_{\sigma}^{\textrm{W}}=\left(1/8\right)\left\vert\nabla\rho_{\sigma}\right\vert/\rho_{\sigma} }[/math]. However, for numerical reasons this may not always be the case and can potentially lead to problems depending on the meta-GGA. When TBOUNDLIBXC=.TRUE., [math]\displaystyle{ \tau_{\sigma}=\max(\tau_{\sigma},\tau_{\sigma}^{\mathrm{W}}) }[/math] is applied before [math]\displaystyle{ \tau_{\sigma} }[/math] is used in a meta-GGA functional from Libxc.