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Résumé |
The long-range Ising (LRI) model, defined to have interactions decaying as a power of
the distance, undergoes a second-order phase transition with the critical exponents
depending on the strength of this power. The corresponding CFTs, which are nonlocal
as they lack a stress tensor, have for many years been advertised as interpolating
between a mean-field theory and the short-range critical Ising model. However, the
latter crossover raises conceptual questions due to three properties of the model that
can be derived exactly.
1. The LRI has two relevant Z2-odd operators.
2. Both of their scaling dimensions are protected.
3. So are the scaling dimensions of odd-spin primaries in their OPE.
I will describe a recently developed duality which reconciles these facts with what we
know about the 2D and 3D Ising models.I will also show how the duality can be used to
estimate the critical exponents when the usual Wilson-Fisher approach is strongly
coupled. Finally, I will explain how the numerical bootstrap can be used to corner this
model and present the results of a six-correlator scan. |
