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pro vyhledávání: '"Kostov, Ivan"'
Autor:
Kostov, Ivan
Basso-Dixon integrals evaluate rectangular fishnets -- Feynman graphs with massless scalar propagators which form a $m\times n$ rectangular grid -- which arise in certain one-trace four-point correlators in the `fishnet' limit of $\mathcal{N}=4$ SYM.
Externí odkaz:
http://arxiv.org/abs/2211.15056
Autor:
Kostov, Ivan
The finite-volume thermodynamics of a massive integrable QFT is described in terms of a grand canonical ensemble of loops immersed in a torus and interacting through scattering factors associated with their intersections. The path integral of the loo
Externí odkaz:
http://arxiv.org/abs/2205.03359
Autor:
Kostov, Ivan, Petkova, Valentina B.
We continue the study of the octagon form factor which helps to evaluate a class of four-point correlation functions in $\mathcal{N}=4$ SYM theory. The octagon is characterised, besides the kinematical parameters, by a "bridge" of $\ell$ propagators
Externí odkaz:
http://arxiv.org/abs/2102.05000
Autor:
Kostov, Ivan
We construct an effective Quantum Field Theory for the wrapping effects in 1+1 dimensional models of factorised scattering. The recently developed graph-theoretical approach to TBA gives the perturbative desctiption of this QFT. For the sake of simpl
Externí odkaz:
http://arxiv.org/abs/1911.07343
We apply the recently developped analytical methods for computing the boundary entropy, or the g-function, in integrable theories with non-diagonal scattering. We consider the particular case of the current-perturbed $SU(2)_k$ WZNW model with boundar
Externí odkaz:
http://arxiv.org/abs/1906.01909
The computation of a certain class of four-point functions of heavily charged BPS operators boils down to the computation of a special form factor - the octagon. In this paper, which is an extended version of the short note [1], we derive a non-pertu
Externí odkaz:
http://arxiv.org/abs/1905.11467
Publikováno v:
Phys. Rev. Lett. 122, 231601 (2019)
We compute to all loop orders correlation function of four heavy BPS operators in $\mathcal{N}$= 4 SYM with special polarisations considered recently by Frank Coronado. Our main result is an expression for the octagon form factor as determinant of a
Externí odkaz:
http://arxiv.org/abs/1903.05038
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We derive a graph expansion for the thermal partition function of solvable two-dimensional models with boundaries. This expansion of the integration measure over the virtual particles winding around the time cycle is obtained with the help of the mat
Externí odkaz:
http://arxiv.org/abs/1809.05705
We propose an alternative, statistical, derivation of the Thermodynamic Bethe Ansatz based on the tree expansion of the Gaudin determinant. We illustrate the method on the simplest example of a theory with diagonal scattering and no bound states. We
Externí odkaz:
http://arxiv.org/abs/1805.02591