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[Fizinfo] BME Elm. Fiz. Szeminárium, márc. 17. - Lencsés Máté

From: Janos Asboth <asboth.janos AT ttk.bme.hu>
To: fizinfo AT lists.kfki.hu, elmfiz.hallgatok AT lists.bme.hu, elmfiz.oktatok-kutatok AT lists.bme.hu
Subject: [Fizinfo] BME Elm. Fiz. Szeminárium, márc. 17. - Lencsés Máté
Date: Wed, 15 Mar 2023 22:39:26 +0100
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Meghívó

BME Elméleti Fizika Szeminárium,

márc. 17. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Lencsés Máté (Wigner FK Elméleti Fizika Osztály):
Multicriticality in Yang--Lee edge singularity

The Yang--Lee edge singularity is related to the anomalous behaviour of
zeroes of the partition function in the two-dimensional Ising model. It was
shown by Cardy, that this behaviour is described by the M(2,5) nonunitary
minimal model of conformal field theory, known as the Yang--Lee model. This
model can be realised as the Ising model above the critical temperature in
an imaginary external magnetic field, as the point where the PT symmetry
becomes spontaneously broken. In this talk, I will consider the analogue of
this scenario in the tricritical Ising model[1], where a three-parameter
family of nonunitary PT-symmetric flows exists. I will present our findings
regarding massless flows ending in the Yang--Lee model and in a nonunitary
"tricritical" point identified as M(2,7). Finally, I will discuss our
conjecture on higher nonunitary multicritical points, connected by
PT-symmetric nonunitary flows.

[1]: M Lencsés, A Miscioscia, G Mussardo, G Takács: Multicriticality in
Yang-Lee edge singularity, arXiv:2211.01123

Minden érdeklődőt szeretettel várunk.
Asbóth János,
szemináriumi koordinátor

[Fizinfo] BME Elm. Fiz. Szeminárium, márc. 17. - Lencsés Máté, Janos Asboth, 03/15/2023