NLO Renormalization in the Hamiltonian Truncation

Understand

Hamiltonian Truncation (a.k.a.

• Truncated Spectrum Approach) is a numerical technique for solving strongly coupled QFTs, in which the full Hilbert space is truncated to a finite-dimensional low-energy subspace.
• The accuracy of the method is limited only by the available computational resources.
• The renormalization program improves the accuracy by carefully integrating out the high-energy states, instead of truncating them away.