By using our novel Grassmann formulation we study the phase transition of the spanning-hyperforest model of the k-uniform complete hypergraph for any k>= 2. The case k=2 reduces to the spanning-forest model on the complete graph. Different k are studied at once by using a microcanonical ensemble in which the number of hypertrees is fixed. The low-temperature phase is characterized by the appearance of a giant hypertree. The phase transition occurs when the number of hypertrees is a fraction (k-1)/k of the total number of vertices. The behaviour at criticality is also studied by means of the coalescence of two saddle points. As the Grassmann formulation exhibits a global supersymmetry we show that the phase transition is second order and is associated to supersymmetry breaking and we explore the pure thermodynamical phase at low temperature by introducing an explicit breaking field.

Phase transition in the spanning-hyperforest model on complete hypergraphs / A. Bedini, S. Caracciolo, A. Sportiello. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - 822:3(2009), pp. 493-516.

Phase transition in the spanning-hyperforest model on complete hypergraphs

A. Bedini
Primo
;
S. Caracciolo
Secondo
;
A. Sportiello
Ultimo
2009

Abstract

By using our novel Grassmann formulation we study the phase transition of the spanning-hyperforest model of the k-uniform complete hypergraph for any k>= 2. The case k=2 reduces to the spanning-forest model on the complete graph. Different k are studied at once by using a microcanonical ensemble in which the number of hypertrees is fixed. The low-temperature phase is characterized by the appearance of a giant hypertree. The phase transition occurs when the number of hypertrees is a fraction (k-1)/k of the total number of vertices. The behaviour at criticality is also studied by means of the coalescence of two saddle points. As the Grassmann formulation exhibits a global supersymmetry we show that the phase transition is second order and is associated to supersymmetry breaking and we explore the pure thermodynamical phase at low temperature by introducing an explicit breaking field.
Potts model ; random cluster model ; Osp(1|2)-invariant σ-model ; spanning trees ; spanning forests
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
2009
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/66707
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