ELFT HÍRADÓ

[Somogyi Gábor <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


            Lencsés Máté
            (HUN-REN Wigner FK)


"Non-unitary multicriticality and PT symmetry breaking”


címmel tartandó szemináriumára.


Kivonat:



In this talk, I will present our recent results on the multicritical 
generalization of the Yang-Lee edge singularity and non-unitary 
renormalization group flows. As an example, I will show that by perturbing 
the tricritical Ising model with imaginary magnetic fields one can find a 
critical Yang-Lee line in the space of couplings. As in the unitary case, the 
critical line ends at the tricritical point, that we call tricritical 
Yang-Lee model. The critical line separates between PT symmetric and broken 
phases, while going around the tricritical point without crossing it, the PT 
symmetry gets broken non-critically, i.e. without the closure of the gap. 
Analogously to the unitary multicritical series, we propose massless flows 
between nonunitary multicritical points and a natural Ginzburg-Landau 
description.



Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2024 április 26. péntek d.u. 2 óra

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                       Somogyi Gábor