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Truncated conformal space approach in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:math>dimensions: A cheap alternative to lattice field theory?
We show how to perform accurate, nonperturbative and controlled calculations in quantum field theory in $d$ dimensions. We use the truncated conformal space approach, a Hamiltonian method which exploits the conformal structure of the UV fixed point. The theory is regulated in the IR by putting it on a sphere …