We discuss the connection between various types of improved actions in the context of the two-dimensional sigma-model. We also discuss spectrum-improved actions showing that these actions do not have any improved behaviour. An O(a(2)) on-shell improved action with all couplings defined on a plaquette and satisfying reflection positivity is also explicitly constructed. (C) 1997 Published by Elsevier Science B.V.
Comparing different improvement programs for the N-vector model / Sergio, Caracciolo; Pelissetto, Andrea. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 402:3-4(1997), pp. 335-340. [10.1016/s0370-2693(97)00495-4]
Comparing different improvement programs for the N-vector model
PELISSETTO, Andrea
1997
Abstract
We discuss the connection between various types of improved actions in the context of the two-dimensional sigma-model. We also discuss spectrum-improved actions showing that these actions do not have any improved behaviour. An O(a(2)) on-shell improved action with all couplings defined on a plaquette and satisfying reflection positivity is also explicitly constructed. (C) 1997 Published by Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
