Non-renormalizability of the HMC algorithm

Details Non-renormalizability of the HMC algorithm Non-renormalizability of the HMC algorithm

2011-03-09

arxiv.org/abs/1103.1810v2

JHEP 1104:104,2011

Physics

High Energy Physics

High Energy Physics - Lattice

Plain TeX source, 23 pages, 3 figures included; v2: typos corrected, agrees with published version

Scientific paper

10.1007/JHEP04(2011)104

In lattice field theory, renormalizable simulation algorithms are attractive, because their scaling behaviour as a function of the lattice spacing is predictable. Algorithms implementing the Langevin equation, for example, are known to be renormalizable if the simulated theory is. In this paper we show that the situation is different in the case of the molecular-dynamics evolution on which the HMC algorithm is based. More precisely, studying the phi^4 theory, we find that the hyperbolic character of the molecular-dynamics equations leads to non-local (and thus non-removable) ultraviolet singularities already at one-loop order of perturbation theory.

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