Alessandro Sfondrini

activity

20112026

most citedThe complete worldsheet S matrix of superstrings on AdS_3 x S^3 x T^4 with mixed three-form flux

134 citations · 2.1k across the 50 of their papers we have counts for

collaborators

52 papers

hep-th2026

Tree-level S matrix for $λ$ -deformed AdS3 strings

Marco Costantino, Silvia Penati, Alessandro Sfondrini

We consider the supersymmetric $λ$ -deformation of $AdS_{3} \times S^{3} \times T^{4}$ superstrings and compute its perturbative bosonic tree-level worldsheet S matri…

hep-th2026

Relativistic limit on the $A d S_{3} \times S^{3} \times S^{3} \times S^{1}$ string worldsheet

Emanuele Maria Cattaneo, Davide Polvara, Alessandro Sfondrini

We study the relativistic limit of the worldsheet S matrix of $A d S_{3} \times S^{3} \times S^{3} \times S^{1}$ strings in the presence of mixed Ramond-Ramond (RR) and Neveu-Schwarz-Neveu-S…

hep-th2025

Revisiting the tensionless limit of pure-Ramond-Ramond AdS3/CFT2

Alberto Brollo, Dennis le Plat, Alessandro Sfondrini

We revisit the numerical solution of the mirror TBA equations for pure--Ramond-Ramond strings on $A d S_{3} \times S^{3} \times T^{4}$ in the tensionless limit. Our analysis uses the recentl…

hep-th2025

On the $A d S_{3} \times S^{3} \times S^{3} \times S^{1}$ dressing factors

Sergey Frolov, Alessandro Sfondrini

We propose dressing factors for massive excitations of the worldsheet S matrix of $A d S_{3} \times S^{3} \times S^{3} \times S^{1}$ supported by mixed Ramond--Ramond and Neveu-Schwarz--Neveu-S…

hep-th2025

Dressing Factors and Mirror Thermodynamic Bethe Ansatz for mixed-flux AdS3/CFT2

Sergey Frolov, Davide Polvara, Alessandro Sfondrini

We complete the derivation of the dressing factors for the $A d S_{3} \times S^{3} \times T^{4}$ S matrix with mixed Ramond--Ramond and Neveu-Schwarz-Neveu-Schwarz flux, in the "string" and…

hep-th2025

Thermodynamics of integrable N=2 theories, squared

Xavier Kervyn, Davide Polvara, Alessandro Sfondrini

In arXiv:2306.17553 a new supersymmetric integrable QFT was constructed from the relativistic limit of the worlsdheet theory of AdS $_{3} \times$ S $^{3} \times$ T $^{4}$ superstrings with m…

hep-th2025

Massive dressing factors for mixed-flux AdS $_{3}$ /CFT $_{2}$

Sergey Frolov, Davide Polvara, Alessandro Sfondrini

We follow up on our proposal for dressing factors for the mixed-flux $A d S_{3} \times S^{3} \times T^{4}$ background presented in arXiv:2402.11732. We discuss in detail the analytic propert…

hep-th2024★ 2 cited

AdS3 Integrability, Tensionless Limits, and Deformations: A Review

Fiona K. Seibold, Alessandro Sfondrini

Motivated by the recent advances in the understanding of integrability for $A d S_{3}$ backgrounds, we present a lightning review of this approach, with particular attention to the "te…

hep-th2024

Dressing Factors for Mixed-Flux $A d S_{3} \times S^{3} \times T^{4}$ Superstrings

Sergey Frolov, Davide Polvara, Alessandro Sfondrini

We propose the dressing factors for the scattering of massive particles on the worldsheet of mixed-flux $A d S_{3} \times S^{3} \times T^{4}$ superstrings, in the string and mirror kinematic…

hep-th2023

On the worldsheet S matrix of the AdS3/CFT2 mixed-flux mirror model

Nicola Baglioni, Davide Polvara, Andrea Pone +1

String on $A d S_{3} \times S^{3} \times T^{4}$ backgrounds are known to be classically integrable in the presence of a mixture of Ramond-Ramond and Neveu-Schwarz-Neveu-Schwarz fluxes. It is…

hep-th2023

More on the tensionless limit of pure-Ramond-Ramond AdS3/CFT2

Alberto Brollo, Dennis le Plat, Alessandro Sfondrini +1

In a recent letter we presented the equations which describe tensionless limit of the excited-state spectrum for strings on $A d S_{3} \times S^{3} \times T^{4}$ supported by Ramond-Ramond f…

hep-th2023★ 1 cited

On mixed-flux worldsheet scattering in AdS3/CFT2

Sergey Frolov, Davide Polvara, Alessandro Sfondrini

Strings on AdS3xS3xT4 with mixed Ramond-Ramond and Neveu-Schwarz-Neveu-Schwarz flux are known to be classically integrable. This is a crucial property of this model, which cannot b…

hep-th2023★ 1 cited

Ground state energy of twisted $A d S_{3} \times S^{3} \times T^{4}$ superstring and the TBA

Sergey Frolov, Anton Pribytok, Alessandro Sfondrini

We use the lightcone $A d S_{3} \times S^{3} \times T^{4}$ superstring sigma model with fermions and bosons subject to twisted boundary conditions to find the ground state energy in th…

hep-th2022★ 39 cited

On the Classical Integrability of Root- $T T$ Flows

Riccardo Borsato, Christian Ferko, Alessandro Sfondrini

The Root- $T T$ flow was recently introduced as a universal and classically marginal deformation of any two-dimensional translation-invariant field theory. The flow commu…

hep-th2022

Transfer matrices for AdS3/CFT2

Fiona K. Seibold, Alessandro Sfondrini

We work out the algebraic Bethe ansatz for the worldsheet theory of the $A d S_{3} \times S^{3} \times T^{4}$ superstring, and use it to derive the transfer matrices for fundamental particle…

hep-th2021★ 39 cited

New Dressing Factors for AdS3/CFT2

Sergey Frolov, Alessandro Sfondrini

The worldsheet S matrix of strings on the $A d S_{3} \times S^{3} \times T^{4}$ background is almost entirely fixed by symmetries, up to five functions -- the dressing factors. These must sa…

hep-th2021★ 35 cited

Mirror Thermodynamic Bethe Ansatz for AdS3/CFT2

Sergey Frolov, Alessandro Sfondrini

We consider superstrings on the pure-Ramond-Ramond $A d S_{3} \times S^{3} \times T^{4}$ background. Using the recently-proposed dressing factors for the worldsheet S matrix, we formulate th…

hep-th2021★ 21 cited

Massless S matrices for AdS3/CFT2

Sergey Frolov, Alessandro Sfondrini

The AdS3/CFT2 correspondence features massless non-relativistic modes on the string worldsheet in lightcone gauge. We study in detail these excitations and highlight how they natur…

hep-th2021★ 4 cited

Bethe Ansatz for Quantum-Deformed Strings

Fiona K. Seibold, Alessandro Sfondrini

Two distinct $η$ -deformations of strings on AdS $_{5} \times$ S $^{5}$ can be defined; both amount to integrable quantum deformations of the string non-linear sigma model, but only one is…

hep-th2021★ 15 cited

Integrable bootstrap for AdS3/CFT2 correlation functions

Burkhard Eden, Dennis le Plat, Alessandro Sfondrini

We propose an integrable bootstrap framework for the computation of correlation functions for superstrings in $A d S_{3} \times S^{3} \times T^{4}$ backgrounds supported by an arbitrary mixt…

hep-th2020★ 8 cited

S matrix for a three-parameter integrable deformation of $A d S_{3} \times S^{3}$ strings

Marco Bocconcello, Isari Masuda, Fiona K. Seibold +1

We consider the three-parameter integrable deformation of the $A d S_{3} \times S^{3}$ superstring background constructed in arXiv:1811.00453. Working on the string worldsheet in uniform…

hep-th2020★ 2 cited

Bound State Scattering Simplified

Marius de Leeuw, Burkhard Eden, Alessandro Sfondrini

In the description of the AdS5/CFT4 duality by an integrable system the scattering matrix for bound states plays a crucial role: it was initially constructed for the evaluation of…

hep-th2019

Multi-particle finite-volume effects for hexagon tessellations

Marius de Leeuw, Burkhard Eden, Dennis le Plat +2

Correlation functions of gauge-invariant composite operators in N=4 super Yang-Mills theory can be computed by integrability using triangulations. The elementary tile in this proce…

hep-th2019★ 55 cited

$T T ˉ$ Flows and (2,2) Supersymmetry

Chih-Kai Chang, Christian Ferko, Savdeep Sethi +2

We construct a solvable deformation of two-dimensional theories with $(2, 2)$ supersymmetry using an irrelevant operator which is a bilinear in the supercurrents. This supercurrent-…

Tree-level S matrix for λ-deformed AdS3 strings

Relativistic limit on the AdS3​×S3×S3×S1 string worldsheet

Revisiting the tensionless limit of pure-Ramond-Ramond AdS3/CFT2

On the AdS3​×S3×S3×S1 dressing factors

Dressing Factors and Mirror Thermodynamic Bethe Ansatz for mixed-flux AdS3/CFT2

Thermodynamics of integrable N=2 theories, squared

Massive dressing factors for mixed-flux AdS3​/CFT2​

AdS3 Integrability, Tensionless Limits, and Deformations: A Review

Dressing Factors for Mixed-Flux AdS3​×S3×T4 Superstrings

On the worldsheet S matrix of the AdS3/CFT2 mixed-flux mirror model

More on the tensionless limit of pure-Ramond-Ramond AdS3/CFT2

On mixed-flux worldsheet scattering in AdS3/CFT2

Ground state energy of twisted AdS3​×S3×T4 superstring and the TBA

On the Classical Integrability of Root-TT Flows

Transfer matrices for AdS3/CFT2

New Dressing Factors for AdS3/CFT2

Mirror Thermodynamic Bethe Ansatz for AdS3/CFT2

Massless S matrices for AdS3/CFT2

Bethe Ansatz for Quantum-Deformed Strings

Integrable bootstrap for AdS3/CFT2 correlation functions

S matrix for a three-parameter integrable deformation of AdS3​×S3 strings

Bound State Scattering Simplified

Multi-particle finite-volume effects for hexagon tessellations

TTˉ Flows and (2,2) Supersymmetry

Tree-level S matrix for $λ$ -deformed AdS3 strings

Relativistic limit on the $A d S_{3} \times S^{3} \times S^{3} \times S^{1}$ string worldsheet

On the $A d S_{3} \times S^{3} \times S^{3} \times S^{1}$ dressing factors

Massive dressing factors for mixed-flux AdS $_{3}$ /CFT $_{2}$

Dressing Factors for Mixed-Flux $A d S_{3} \times S^{3} \times T^{4}$ Superstrings

Ground state energy of twisted $A d S_{3} \times S^{3} \times T^{4}$ superstring and the TBA

On the Classical Integrability of Root- $T T$ Flows

S matrix for a three-parameter integrable deformation of $A d S_{3} \times S^{3}$ strings

$T T ˉ$ Flows and (2,2) Supersymmetry