Starts 20 Nov 2018 11:00

Ends 20 Nov 2018 12:00

Central European Time

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Joint ICTP/SISSA Statistical Physics Seminar: A Study of a Non-Unitary Statistical Model: Super Spin Chains and Intersecting Loops

Starts 20 Nov 2018 11:00

Ends 20 Nov 2018 12:00

Central European Time

SISSA Via Bonomea 265, rm 128

We study a non-unitary spin chain with orthosymplectic symmetry that generalizes the O(N) model to any positive or negative integer N. The lack of unitarity allows a stable massless Goldstone phase to appear, otherwise forbidden by the Mermin-Wagner theorem, that is described by a supersphere sigma model. On the 2D lattice it is represented as a dense loop model with loop weight N in which crossings are allowed. Unlike the usual O(N) loop model, the presence of crossings makes the model flow to a different regime where correlations involve logarithms. We compute these logarithmic critical exponents with field theory and the Bethe ansatz.