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[Fizinfo] BME Elm. Fiz. Szeminárium, feb. 27. Nagy Botond (házi védés)

From: Kormos Márton <kormos.marton AT ttk.bme.hu>
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Subject: [Fizinfo] BME Elm. Fiz. Szeminárium, feb. 27. Nagy Botond (házi védés)
Date: Wed, 25 Feb 2026 19:49:22 +0000
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MEGHÍVÓ

BME Elméleti Fizika Szeminárium,

feb. 27. péntek 10h15,

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

Nagy Botond (BME Elm. Fiz. Tanszék)
Dynamics in low-dimensional interacting quantum field theories (házi védés)

In my dissertation I study the nonequilibrium behavior of an integrable
quantum field theory, namely the sine-Gordon model, within the framework of
Generalized Hydrodynamics (GHD). A prerequisite for applying GHD is having
full control of the thermodynamic Bethe Ansatz (TBA) description of the model.

In this presentation, I outline the derivation of the TBA for the sine-Gordon
model for general rational values of the coupling constant. Employing the
principles of GHD, I compute ballistic and diffusive transport coefficients.
Remarkably, some of these coefficients exhibit a fractal dependence on the
coupling, indicating anomalous transport exponents within the system.

Then I present the results of an extensive numerical investigation of the
cumulant generating functions of the lowest lying conserved charges,
exhibiting a similar fractal dependence. The numerical findings are
corroborated thorugh analytical cross-checks in regimes where exact results
are available.

Finally, I examine the solution of the GHD time-evolution equations for an
initially localized topological charge bump. I discuss the observation that
energy and charge propagate with distinct velocities, depsite being carried
by the same particles – a similar phenomenon to spin-charge separation.

Minden érdeklődőt szeretettel várunk.

Kormos Márton,
szemináriumi koordinátor

[Fizinfo] BME Elm. Fiz. Szeminárium, feb. 27. Nagy Botond (házi védés), Kormos Márton, 02/25/2026