We study the finite-size behaviour of a tree-level on-shell improved action for the N-vector model. We present numerical results for N = 3 and analytic results in the large-N limit for the mass gap. We also report a perturbative computation at one loop of the mass gap for states of spatial momentum p. We present a detailed comparison of the behaviour of this action with that of other formulations, including the perfect action, and a critical discussion of the different approaches to the problem of action improvement. (C) 1999 Elsevier Science B.V. All rights reserved.
Testing the efficiency of different improvement programs / Sergio, Caracciolo; Andrea, Montanari; Pelissetto, Andrea. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - STAMPA. - 556:1-2(1999), pp. 295-326. [10.1016/s0550-3213(99)00373-9]
Testing the efficiency of different improvement programs
PELISSETTO, Andrea
1999
Abstract
We study the finite-size behaviour of a tree-level on-shell improved action for the N-vector model. We present numerical results for N = 3 and analytic results in the large-N limit for the mass gap. We also report a perturbative computation at one loop of the mass gap for states of spatial momentum p. We present a detailed comparison of the behaviour of this action with that of other formulations, including the perfect action, and a critical discussion of the different approaches to the problem of action improvement. (C) 1999 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
