Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review
Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Equilibrium and ground states from Cayley graphs
AU - Thomsen, Klaus
AU - Christensen, Johannes
PY - 2018
Y1 - 2018
N2 - We present a general framework for the study of KMS states of generalized gauge actions on the C ⁎-algebra of a Cayley graph which is pointed by considering the neutral element of the group as a distinguished vertex. We use this framework to give a concrete description of a particular kind of KMS states on the C ⁎-algebras that we call abelian KMS states. If the group is nilpotent all KMS states are abelian and our analysis gives the full picture in this case. We then describe the ground states that are limits of abelian KMS states when the temperature goes to zero.
AB - We present a general framework for the study of KMS states of generalized gauge actions on the C ⁎-algebra of a Cayley graph which is pointed by considering the neutral element of the group as a distinguished vertex. We use this framework to give a concrete description of a particular kind of KMS states on the C ⁎-algebras that we call abelian KMS states. If the group is nilpotent all KMS states are abelian and our analysis gives the full picture in this case. We then describe the ground states that are limits of abelian KMS states when the temperature goes to zero.
KW - Abelian KMS states
KW - Cayley graphs
KW - Ground states
KW - KMS states
U2 - 10.1016/j.jfa.2017.06.019
DO - 10.1016/j.jfa.2017.06.019
M3 - Journal article
VL - 274
SP - 1553
EP - 1586
JO - Journal of Functional Analysis
JF - Journal of Functional Analysis
SN - 0022-1236
IS - 5
ER -