New analytic and Monte Carlo-assisted method tightens energy-based boson truncation bounds, reducing volume dependence in (1+1)D scalar and (2+1)D U(1) gauge theories.
As mentioned in Section VB, the maximalλmax such that ˆHU(1) −λ max 1 a g2 2 P p( ˆRp)2 is positive-semidefinite will decrease considerably fast as the lattice size increases
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Tightening energy-based boson truncation bound using Monte Carlo-assisted methods
New analytic and Monte Carlo-assisted method tightens energy-based boson truncation bounds, reducing volume dependence in (1+1)D scalar and (2+1)D U(1) gauge theories.